JP4131108B2 - Seat system and external noise canceling device usable therefor - Google Patents

Description

【００５８】
また、ノイズ信号予測回路２２は、係数メモリ１０７を有している。この係数メモリ１０７は、後述する推定予測演算回路１１０で使用される推定式の係数データを、クラス毎に、格納するものである。この係数データは、ノイズ信号Ｓ_NZ(T-α)を相殺信号Ｓ_-NZ(T)に変換するための情報である。係数メモリ１０７には、上述したクラス検出回路１０６より出力されるクラスコードＣＬが読み出しアドレス情報として供給される。この係数メモリ１０７からはクラスコードＣＬに対応した係数データＷｉが読み出され、推定予測演算回路１１０に供給される。
【００５９】
また、ノイズ信号予測回路２２は、情報メモリバンク１０８を有している。後述する推定予測演算回路１１０では、予測タップのデータｘｉと、係数メモリ１０７より読み出される係数データＷｉとから、（３）式の推定式によって、作成すべき相殺信号Ｓ_-NZ(T)の注目位置のデータｙが演算される。（３）式のｎは、第１のタップ選択回路１０４で選択される予測タップの数を表している。
【００６０】
【数２】

【００６１】
そして、推定式の係数データＷｉ（ｉ＝１〜ｎ）は、例えば（４）式に示すように、パラメータｈを含む生成式によって生成される。情報メモリバンク１０８には、この生成式における係数データである係数種データｗ_i0〜ｗ_i3が、クラス毎に、格納されている。この係数種データの生成方法については後述する。
【００６２】
【数３】

【００６３】
また、ノイズ信号予測回路２２は、各クラスの係数種データおよびパラメータｈの値とを用い、（４）式によって、クラス毎に、パラメータｈの値に対応した推定式の係数データＷｉ（ｉ＝１〜ｎ）を生成する係数生成回路１０９を有している。この係数生成回路１０９には、情報メモリバンク１０８より、上述した各クラスの係数種データがロードされる。また、この係数生成回路１０９には、システムコントローラ３０（図８参照）より、パラメータｈの値が供給される。
【００６４】
この係数生成回路１０９で生成される各クラスの係数データＷｉ（ｉ＝１〜ｎ）は、上述した係数メモリ１０７に格納される。この係数生成回路１０９における各クラスの係数データＷｉの生成は、パラメータｈの値が変更される都度行われる。
【００６５】
また、ノイズ信号予測回路２２は、第１のタップ選択回路１０４で選択的に取り出される予測タップのデータｘｉと、係数メモリ１０７よりクラスコードＣＬに基づいて読み出される係数データＷｉとから、（３）式の推定式によって、作成すべき相殺信号Ｓ_-NZ(T)における注目位置のデータｙを演算する推定予測演算回路１１０を有している。
【００６６】
また、ノイズ信号予測回路２２は、推定予測演算回路１１０より順次出力されるデータｙからなるデジタル信号としての相殺信号Ｓ_-NZ(T)をアナログ信号に変換するＤ／Ａコンバータ１１１と、アナログ信号とされた相殺信号Ｓ_-NZ(T)を出力する出力端子１１２とを有している。
【００６７】
次に、ノイズ信号予測回路２２の動作を説明する。
バッファメモリ１０３に記憶されているノイズ信号Ｓ_NZ(T-α)より、第２のタップ選択回路１０５で、作成すべき相殺信号Ｓ_-NZ(T)における注目位置の周辺に位置するクラスタップのデータが選択的に取り出される。この第２のタップ選択回路１０５で選択的に取り出されるクラスタップのデータはクラス検出回路１０６に供給される。クラス検出回路１０６では、クラスタップのデータからレベル分布パターンが特徴量として検出され、このレベル分布パターンに基づいて、上述の注目位置のデータが属するクラスを示すクラスコードＣＬが得られる（（２）式参照）。
【００６８】
このクラスコードＣＬは、係数メモリ１０７に読み出しアドレス情報として供給される。係数メモリ１０７には、係数生成回路１０９で、パラメータｈの値に対応して、クラス毎に、係数種データｗ_i0〜ｗ_i3 を用いて推定式の係数データＷｉ（ｉ＝１〜ｎ）が求められて格納されている（（４）式参照）。係数メモリ１０７に上述したようにクラスコードＣＬが読み出しアドレス情報として供給されることで、この係数メモリ１０７からクラスコードＣＬに対応した推定式の係数データＷｉが読み出されて推定予測演算回路１１０に供給される。
【００６９】
また、バッファメモリ１０３に記憶されているノイズ信号Ｓ_NZ(T-α)より、第１のタップ選択回路１０４で、作成すべき相殺信号Ｓ_-NZ(T)における注目位置の周辺に位置する予測タップのデータが選択的に取り出される。推定予測演算回路１１０では、予測タップのデータｘｉと、係数メモリ１０９より読み出される係数データＷｉとを用いて、（３）式の推定式に基づいて、作成すべき相殺信号Ｓ_-NZ(T)における注目位置のデータｙが演算される。
【００７０】
そして、推定予測演算回路１１０より順次演算されるデータｙからなる相殺信号Ｓ_-NZ(T)はＤ／Ａコンバータ１１１でアナログ信号に変換された後に出力端子１１２に出力される。
【００７１】
このように、ノイズ信号予測回路２２では、パラメータｈの値に対応した推定式の係数データＷｉ（ｉ＝１〜ｎ）が使用されて、相殺信号Ｓ_-NZ(T)における注目位置のデータｙが演算される。したがって、パラメータｈの値を調整することで、マイクロホンＭで集音される環境音に対する、相殺音で相殺すべきノイズ音が含まれる環境音の任意の進み時間をαとして、任意の進み時間αに対応した相殺音の放音を行い得る相殺信号Ｓ_-NZ(T)を得ることができる。また、パラメータｈの値に対応した各クラスの係数データＷｉを係数生成回路１０９で生成して使用するものであり、大量の係数データを格納しておくメモリは必要なくなり、メモリの節約を図ることができる。
【００７２】
次に、係数種データの生成方法の一例について説明する。ここでは、上述した（４）式の生成式における係数データである係数種データｗ_i0〜ｗ_i3（ｉ＝１〜ｎ）を求める例を示すものとする。ここで、以下の説明のため、（５）式のように、ｔｊ（ｊ＝０〜３）を定義する。
ｔ₀＝１，ｔ₁＝ｈ，ｔ₂＝ｈ²，ｔ₃＝ｈ³ ・・・（５）
この（５）式を用いると、（４）式は、（６）式のように書き換えられる。
【００７３】
【数４】

【００７４】
最終的に、学習によって未定係数ｗ_ijを求める。すなわち、クラス毎に、複数のノイズ信号Ｓ_NZ(T-α)に対応した生徒信号のデータおよび相殺信号Ｓ_-NZ(T)に対応した教師信号のデータを用いて、二乗誤差を最小にする係数値を決定する。いわゆる最小二乗法による解法である。学習数をｍ、ｋ（１≦ｋ≦ｍ）番目の学習データにおける残差をｅ_k、二乗誤差の総和をＥとすると、（３）式および（４）式を用いて、Ｅは（７）式で表される。ここで、ｘ_ikは生徒信号のｉ番目の予測タップ位置におけるｋ番目のデータ、ｙ_kはそれに対応するｋ番目の教師信号のデータを表している。
【００７５】
【数５】

【００７６】
最小二乗法による解法では、（７）式のｗ_ijによる偏微分が０になるようなｗ_ijを求める。これは、（８）式で示される。
【００７７】
【数６】

【００７８】
以下、（９）式、（１０）式のように、Ｘ_ipjq、Ｙ_ipを定義すると、（８）式は、（１１）式のように行列を用いて書き換えられる。
【００７９】
【数７】

【００８０】
【数８】

【００８１】
この方程式は一般に正規方程式と呼ばれている。この正規方程式は、掃き出し法（Gauss-Jordanの消去法）等を用いて、ｗ_ijについて解かれ、係数種データが算出される。
【００８２】
図１１は、上述した係数種データの生成方法の一例の概念を示している。相殺信号Ｓ_-NZ(T)に対応した教師信号から、ノイズ信号Ｓ_NZ(T-α)に対応した複数の生徒信号を生成する。例えば、遅延時間αを変化させるパラメータｈを９段階に可変し、９種類の生徒信号を生成する。このようにして生成された複数の生徒信号と教師信号との間で学習を行って係数種データを生成する。
【００８３】
図１２は、上述したノイズ信号予測回路２２の情報メモリバンク１０８に格納される係数種データｗ₁₀〜ｗ_n3を生成するための係数種データ生成装置１５０の構成を示している。
【００８４】
この係数種データ生成装置１５０は、相殺信号Ｓ_-NZ(T)に対応した教師信号ＳＴ（デジタル信号）が入力される入力端子１５１と、この教師信号ＳＴに対して遅延および反転処理を行ってノイズ信号Ｓ_NZ(T-α)に対応した生徒信号ＳＳを得る遅延反転回路１５２とを有している。この遅延反転回路１５２には、上述したノイズ信号予測回路２２（図１０参照）におけるパラメータｈの値と対応した、パラメータｈの値が入力される。遅延反転回路１５２では、このパラメータｈに基づいて、遅延時間αが可変される。
【００８５】
また、係数種データ生成装置１５０は、遅延反転回路１５２より出力される生徒信号ＳＳより、教師信号ＳＴにおける注目位置の周辺に位置する複数のデータを選択的に取り出して出力する第１のタップ選択回路１５３および第２のタップ選択回路１５４を有している。これら第１、第２のタップ選択回路１５３，１５４は、それぞれ上述したノイズ信号予測回路２２の第１，第２のタップ選択回路１０４，１０５と同様に構成される。
【００８６】
また、係数種データ生成装置１５０は、第２のタップ選択回路１０５で選択的に取り出されるクラスタップのデータからレベル分布パターンを特徴量として検出し、このレベル分布パターンに基づいて、教師信号ＳＴにおける注目位置のデータが属するクラスを示すクラスコードＣＬを発生するクラス検出回路１５５を有している。このクラス検出回路１５５は、上述したノイズ信号予測回路２２のクラス検出回路１０６と同様に構成される。
【００８７】
また、係数種データ生成装置１５０は、入力端子１５１に供給される教師信号ＳＴから得られる注目位置の各データｙと、この各データｙにそれぞれ対応して第１のタップ選択回路１５３で選択的に取り出される予測タップのデータｘｉと、パラメータｈの値と、各データｙにそれぞれ対応してクラス検出回路１５５で発生されるクラスコードＣＬとを用いて、クラス毎に、係数種データｗ₁₀〜ｗ_n3を得るための正規方程式（（１１）式参照）を生成する正規方程式生成部１５６を有している。
【００８８】
この場合、１個のデータｙとそれに対応するｎ個の予測タップのデータｘｉ（ｉ＝１〜ｎ）との組み合わせで１個の学習データが生成されるが、パラメータｈの値の変化に対応して遅延反転回路１５２における遅延時間αが可変され、複数の生徒信号ＳＳが順次生成されていき、教師信号ＳＴと各生徒信号ＳＳとの間でそれぞれ学習データの生成が行われる。これにより、正規方程式生成部１５６では、パラメータｈの値が異なる多くの学習データが登録された正規方程式が生成され、係数種データｗ₁₀〜ｗ_n3を求めることが可能となる。
【００８９】
また、係数種データ生成装置１５０は、正規方程式生成部１５６で、クラス毎に生成された正規方程式のデータが供給され、当該正規方程式を解いて、クラス毎に、係数種データｗ₁₀〜ｗ_n3を求める係数種データ決定部１５７と、この求められた係数種データｗ₁₀〜ｗ_n3を格納する係数種メモリ１５８とを有している。係数種データ決定部１５７では、正規方程式が例えば掃き出し法などによって解かれて、係数種データが求められる。
【００９０】
図１２に示す係数種データ生成装置１５０の動作を説明する。
入力端子１５１には相殺信号Ｓ_-NZ(T)に対応した教師信号ＳＴ（デジタル信号）が供給され、そしてこの教師信号ＳＴに対して遅延反転回路１５２で遅延反転の処理が行われて、ノイズ信号Ｓ_NZ(T-α)に対応した生徒信号ＳＳが生成される。この場合、遅延反転回路１５２には、ノイズ信号予測回路２２（図１０参照）におけるパラメータｈの値と対応したパラメータｈの値が入力される。遅延反転回路１５２では、このパラメータｈに基づいて、遅延時間αが可変される。
【００９１】
また、遅延反転回路１５２で生成された生徒信号ＳＳより、第２のタップ選択回路１５４で、教師信号ＳＴにおける注目位置の周辺に位置するクラスタップのデータが選択的に取り出される。このクラスタップのデータはクラス検出回路１５５に供給される。このクラス検出回路１５５では、クラスタップのデータからレベル分布パターンが特徴量として検出され、このレベル分布パターンに基づいて、教師信号ＳＴにおける注目位置のデータが属するクラスを示すクラスコードＣＬが発生される。
【００９２】
また、遅延反転回路１５２で生成される生徒信号ＳＳより、第１のタップ選択回路１５３で、教師信号ＳＴにおける注目位置の周辺に位置する予測タップのデータが選択的に取り出される。
【００９３】
そして、入力端子１５１に供給される教師信号ＳＴから得られる注目位置の各データｙと、この各データｙにそれぞれ対応して第１のタップ選択回路１５３で選択的に取り出される予測タップのデータｘｉと、パラメータｈの値と、各データｙにそれぞれ対応してクラス検出回路１５５で発生されるクラスコードＣＬとを用いて、正規方程式生成部１５６では、クラス毎に、係数種データｗ₁₀〜ｗ_n3を得るための正規方程式（（１１）式参照）が生成される。
【００９４】
そして、係数種データ決定部１５７で各正規方程式が解かれ、クラス毎の係数種データｗ₁₀〜ｗ_n3が求められ、それらの係数種データｗ₁₀〜ｗ_n3 は係数種メモリ１５８に格納される。
【００９５】
このように、図１２に示す係数種データ生成装置１５０においては、図１０のノイズ信号予測回路２２の情報メモリバンク１０８に格納される、クラス毎の、推定式（（３）式参照）で用いられる係数データＷｉを求めるための生成式（（４）式参照）における係数データである係数種データｗ₁₀〜ｗ_n3を生成することができる。
【００９６】
なお、上述実地の形態においては、システムコントローラ３０は、各シート１３の前後リンクスイッチ１７の設定情報および移動検出器１６の検出出力に基づいてグルーピング領域の設定を認識するものを示したが、各シート１３に前後リンクスイッチ１７を設ける代わりに、各シート１３を前後方向に例えば３段階に移動可能とし、その移動を検出する移動検出器を設け、各シートの左右方向の移動検出出力と共に前後方向の移動検出出力をシステムコントローラ３０に供給し、システムコントローラ３０はそれらの移動検出出力のみに基づいてグルーピング領域の設定を認識する構成としてもよい。
【００９７】
また、上述実施の形態において、シートエリア１２に図２に示すようにシート１３が配置されたものを説明したが、シートエリア１２に図１３に示すようなシート２３が配置されるようにしてもよい。この図１３において、図２と対応する部分には、同一符号を付して示している。この図１３においても、シート２３に取り付けられるスピーカやマイクロホンは、シート２３の内部にあるものにおいても実線で示している。
【００９８】
シート２３は、ベース部２３Ａと、このベース部２３Ａの後端に上方に接続され、横断面が後方に凸となる形状とされた背もたれ部２３Ｂと、ベース部２３Ａの両端から上方に接続された肘掛け部２３Ｃと、ベース部２３Ａおよび背もたれ部２３Ｂの下面に接続された脚部２３Ｄとから構成されている。
【００９９】
このシート２３は、当該シート２３を左右方向に移動させるためのレール１５上に配置されている。このシート２３は、左右方向に関しては、右側位置、中央位置、左側位置の３段階の移動が可能となるようにされている。この場合、シート２３の位置が左側位置あるいは右側位置とされても、隣接する他のシート１３とは密着しないように、これら左側位置、右側位置が設定されている。
【０１００】
また、シート２３の背もたれ部２３Ｂには、後面中央に後ろ直進方向に向けたスピーカＳ_BCと、後面右側に後ろ斜め右方向に向けたスピーカＳ_BRと、後面左側に後ろ斜め左方向に向けたスピーカＳ_BLと、前面中央に前直進方向に向けたスピーカＳ_FCと、前面右側に前斜め左方向に向けたスピーカＳ_FRと、全面左側に前斜め右方向に向けたスピーカＳ_FLとが設けられている。これらスピーカＳ_BC，Ｓ_BR，Ｓ_BL，Ｓ_FC，Ｓ_FR，Ｓ_FLは、電気音響変換手段を構成し、ノイズ音を相殺するための相殺音を放音するためのものである。
【０１０１】
また、シート２３の背もたれ部２３Ｂには、スピーカＳ_BC，Ｓ_BR，Ｓ_BL，Ｓ_FC，Ｓ_FR，Ｓ_FLとそれぞれ対にしてマイクロホンＭ_BC，Ｍ_BR，Ｍ_BL，Ｍ_FC，Ｍ_FR，Ｍ_FLが設けられている。これらマイクロホンＭ_BC，Ｍ_BR，Ｍ_BL，Ｍ_FC，Ｍ_FR，Ｍ_FLは、音響電気変換手段を構成し、環境音を集音するためのものである。
【０１０２】
マイクロホンＭ_BCは、後ろ直進方向に向かう環境音を集音するためのものである。マイクロホンＭ_BRは後ろ斜め右方向に向かう環境音を集音するためのものである。マイクロホンＭ_BLは後ろ斜め左方向に向かう環境音を集音するためのものである。マイクロホンＭ_FCは前直進方向に向かう環境音を集音するためのものである。マイクロホンＭ_FRは前斜め左方向に向かう環境音を集音するためのものである。マイクロホンＭ_FLは前斜め右方向に向かう環境音を集音するためのものである。
【０１０３】
また、シート２３の背もたれ部２３Ｂの右端には、左方向に向けたスピーカＳ_Rが設けられている。同様に、シート２３の背もたれ部２３Ｂの左端には、右方向に向けたスピーカＳ_Lが設けられている。これら、スピーカＳ_R，Ｓ_Lは、電気音響変換手段を構成し、ノイズ音を相殺するための相殺音を放音するためのものである。
【０１０４】
また、シート１３の背もたれ部１３Ｂの右端、左端には、スピーカＳ_R，Ｓ_Lとそれぞれ対にしてマイクロホンＭ_R，Ｍ_Lが設けられている。これらマイクロホンＭ_R，Ｍ_Lは、音響電気変換手段を構成し、環境音を集音するためのものである。マイクロホンＭ_Rは、左方向に向かう環境音を集音するためのものである。マイクロホンＭ_Lは右方向に向かう環境音を集音するためのものである。
【０１０５】
また、シート１３の背もたれ部１３Ｂの背面側に、制御パネル２５が設けられている。図１４は、制御パネル２５の具体構成を示している。この制御パネル２５には、当該シート２３に向かってくる８方向からのノイズ音をそれぞれ相殺するようにユーザが設定する際に使用する８個の操作キー２６_-1〜２６_-8が配置されている。各操作キーの押圧の繰り返しにより、相殺設定を交互にオン（ＯＮ）状態およびオフ（ＯＦＦ）状態とできる。また、各操作キーの部分には発光素子が配置されており、オン状態では点灯し、オフ状態では消灯する。この制御パネル２５は、グルーピング領域設定手段を構成している。この制御パネル２５の各操作キーによる相殺設定情報は、シートエリア１２に配された複数のシート２３におけるノイズ相殺動作を制御するシステムコントローラ３０（図８参照）に供給される。
【０１０６】
システムコントローラ３０は、各シート２３の制御パネル２５からの相殺設定情報に基づいて、グルーピング領域の境界に対応し、当該グルーピング領域内に向けて相殺音を放音するスピーカのみから相殺音が放音されるように制御することとなる。これにより、グルーピング領域内では、領域外部からのノイズ音を排除でき、かつ会話を共有できるようになる。
【０１０７】
また、上述実施の形態においては、グルーピング領域の設定は、各シート１３に対応した水平移動検出器１６および前後リンクスイッチ１７の設定などに基づいて行われるものであるが、オペレータが操作部３１の操作によって任意に設定可能としてもよい。
【０１０８】
また、上述実施の形態におけるノイズ信号予測回路２２では、係数生成回路１０９で各クラスの係数種データｗ₁₀〜ｗ_n3を用いてパラメータｈの値に対応した各クラスの係数データＷｉ（ｉ＝１〜ｎ）を生成し、それを係数メモリ１０７に格納して使用するものを示したが、例えば情報メモリバンク１０８にパラメータｈの各値に対応した各クラスの係数データＷｉ（ｉ＝１〜ｎ）を予め蓄積しておき、この情報メモリバンク１０８からパラメータｈの値に対応した各クラスの係数データＷｉ（ｉ＝１〜ｎ）を読み出して係数メモリ１０７に格納して使用してもよい。
【０１０９】
また、上述実施の形態におけるノイズ信号予測回路２２では、相殺信号Ｓ_-NZ(T)における注目位置のデータｙを生成する際の推定式として線形一次方程式を使用したものを挙げたが、これに限定されるものではなく、例えば推定式として高次方程式を使用することも考えられる。
【０１１０】
また、上述実施の形態においては、前後方向のシート１３，１３が図１５Ａに示すように同一平面に配置されているものを想定したものであるが、この発明は、前後方向のシート１３，１３が図１５Ｂに示すように階段状に配置されるものにも同様に適用できる。その場合、シート１３の背もたれ部１３Ｂに取り付けられる前後方向に向くスピーカＳおよびマイクＭの向きは、例えばこの階段の傾斜に沿う方向とされればよい。
【０１１１】
【発明の効果】
この発明に係るシートシステムによれば、１個または２個以上のシートからなるグルーピング領域の設定を可能とし、このグルーピング領域の境界に対応する放音部のみから外部ノイズ音を相殺する相殺音を放音する構成としたものであり、グルーピング領域内では、領域外部からのノイズ音を排除でき、かつ会話を共有できるようになる。相殺音は、環境音信号から抽出されたノイズ信号にクラス分類適応処理を用いることにより得られた相殺信号から生成される。
【０１１２】
また、この発明に係る外部ノイズ相殺装置によれば、複数の方向からの環境音をそれぞれ集音する複数の集音部と、この複数の集音部とそれぞれ対にして設けられ、この複数の集音部で集音された環境音に基づいてノイズ音を相殺するための相殺音を放音する複数の放音部を備え、環境音信号から抽出されたノイズ信号からクラス分類適応処理によって相殺信号を得る構成とするものであり、外部ノイズ音を良好に相殺できる。
【図面の簡単な説明】
【図１】この発明に係るシートシステムが適用された映画館の概略を示す図である。
【図２】シートの概略構成を示す図である。
【図３】グループ化の概念図（シート数：左右２）である。
【図４】グループ化の概念図（シート数：左右２×前後２）である。
【図５】外部ノイズ相殺動作（シート数：１）を説明するための図である。
【図６】外部ノイズ相殺動作（シート数：左右２）を説明するための図である。
【図７】外部ノイズ相殺動作（シート数：左右２×前後２）を説明するための図である。
【図８】ノイズ相殺動作に係る回路構成を示すブロック図である。
【図９】ノイズ音の相殺動作を示す概念図である。
【図１０】ノイズ信号予測回路の構成を示すブロック図である。
【図１１】係数種データの生成方法を説明するための図である。
【図１２】係数種データ生成装置の構成を示すブロック図である。
【図１３】シートの他の概略構成を示す図である。
【図１４】制御パネルの具体構成を示し図である。
【図１５】シートの前後方向の配置面の例を示す図である。
【符号の説明】
１０・・・映画館、１２・・・シートエリア、１３，２３・・・シート、１３Ａ・・・ベース、１３Ｂ・・・背もたれ部、１３Ｃ・・・肘掛け部、１３Ｅ・・・アーム部、１５・・・レール、１６・・・移動検出器、１７・・・前後リンクスイッチ、２０・・・シート回路部、２１，２１_-1〜２１_-8・・・差分演算器、２２，２２_-1〜２２_-8・・・ノイズ信号予測回路、３０・・・システムコントローラ、３１・・・操作部、３２・・・表示部、３３・・・記憶装置、１０１・・・入力端子、１０３・・・バッファメモリ、１０４・・・第１のタップ選択回路、１０５・・・第２のタップ選択回路、１０６・・・クラス検出回路、１０７・・・係数メモリ、１０８・・・情報メモリバンク、１０９・・・係数生成回路、１１０・・・推定予測演算回路、１１２・・・出力端子、１５０・・・係数種データ生成装置、１５１・・・入力端子、１５２・・・遅延反転回路、１５３・・・第１のタップ選択回路、１５４・・・第２のタップ選択回路、１５５・・・クラス検出回路、１５６・・・正規方程式生成部、１５７・・・係数種データ決定部、１５８・・・係数種メモリ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat system suitable for application to, for example, a theater and a movie theater, and an external noise canceling apparatus that can be used therefor.
[0002]
Specifically, a grouping area composed of one or two or more sheets can be set, and a canceling sound that cancels the external noise sound is emitted only from the sound emitting part corresponding to the boundary of the grouping area. Thus, in the grouping area, the noise system from outside the area can be eliminated and the conversation can be shared.
[0003]
Also, a plurality of sound collecting units that collect environmental sounds from a plurality of directions, respectively, and a plurality of sound collecting units provided in pairs, and based on the environmental sounds collected by the plurality of sound collecting units. And a plurality of sound emitting units for emitting canceling sounds for canceling noise sounds, and by using a configuration that obtains canceling signals from the noise signals extracted from the environmental sound signals by class classification adaptive processing, external noise The present invention relates to an external noise canceling apparatus capable of canceling sound satisfactorily.
[0004]
[Prior art]
In a theater or a movie theater, a seat area is provided opposite to a stage or a screen, and a plurality of seats (seats) are arranged in an orderly manner in the seat area.
Conventionally, a plurality of sound collecting units that collect environmental sounds (noise sounds) and a plurality of sound collecting units are provided as a pair, and noise is generated based on the environmental sounds collected by the plurality of sound collecting units. There has been proposed an external noise reduction device that includes a plurality of sound emission units that emit a canceling sound for canceling a sound to reduce external noise (see Japanese Patent Application Laid-Open No. 2000-242277).
[0005]
[Problems to be solved by the invention]
By applying the above-described external noise reduction device to a seat (seat), it is possible to reduce the external noise sound for the audience sitting on the seat.
However, when a spectator who came in a group is seated on an adjacent seat, the conversation noise between adjacent spectators in the same group is also reduced as a noise sound if each seat simply reduces external noise. This makes it difficult to share the venue within the group.
[0006]
Further, in the conventional external noise reduction device, the noise signal extracted based on the environmental sound collected by the sound collecting unit is inverted, and the canceling sound is generated by the sound emitting unit using the inverted noise signal. It is configured to emit sound. In other words, it is assumed that there is no time difference between the time when the environmental sound is collected by the sound collection unit and the time when the canceling sound is emitted by the sound emission unit due to the inverted noise signal obtained based on the collected environmental sound. I handle it.
[0007]
However, in reality, there is a time difference caused by the signal processing system between these time points, so that the canceling sound emitted from the sound emitting unit may not cancel the noise sound included in the environmental sound at that time. is there.
[0008]
Accordingly, an object of the present invention is to provide a seat system in which noise sounds from outside the area can be eliminated and conversation can be shared within the grouping area. Another object of the present invention is to provide an external noise canceling device that can satisfactorily cancel external noise.
[0009]
[Means for Solving the Problems]
  The seat system according to the present invention includes a plurality of sound collection units that collect environmental sounds from a plurality of directions, respectively, and a situation in which there is no environmental sound and noise sound collected by the plurality of sound collection units. A plurality of sound emitting portions each for emitting a canceling sound for canceling a noise sound based on a reference sound signal that is a sound signal of the sound signal, and one or two of the plurality of sheets are provided. A region setting unit that sets a grouping region including at least one sheet, and a sound emitting unit that corresponds to the boundary of the grouping region set by the region setting unit and emits a canceling sound toward the grouping region. Control means for controlling to cancel the canceling soundThe sound collecting unit includes an acoustoelectric converting unit that converts the collected environmental sound into an electric signal, and the sound emitting unit is based on an output signal of the corresponding acoustoelectric converting unit of the sound collecting unit. A noise signal extraction unit that extracts a noise signal corresponding to the noise sound by removing an audio signal, and a position of interest in the cancellation signal corresponding to the cancellation sound based on the noise signal extracted by the noise signal extraction unit Based on a first data selection means for selecting a plurality of first data for class detection located in the vicinity, and a level distribution pattern of the plurality of first data selected by the first data selection means A class detection unit for detecting a class to which the data of the target position belongs, and an estimation formula for obtaining data of the target position in the cancellation signal corresponding to the class detected by the class detection unit. Coefficient data generating means for generating coefficient data to be used, and a plurality of second data for prediction located around the position of interest in the cancellation signal based on the noise signal extracted by the noise signal extracting means Using the second data selection means, the coefficient data generated by the coefficient data generation means, and a plurality of second data selected by the second data selection means, based on the estimation formula, Computation means for obtaining data of a position of interest in the signal, and electroacoustic conversion means for converting a cancellation signal composed of the data obtained by the calculation means into a cancellation soundIs.
[0010]
In the present invention, a plurality of seats (seats) are provided. Each sheet includes a plurality of sound collecting units and a plurality of sound emitting units that emit canceling sounds for canceling noise sounds based on the environmental sounds collected by the plurality of sound collecting units. Is provided. Then, a grouping area including one or more sheets is set from the plurality of sheets by the area setting means.
[0011]
For example, the sheet can be moved in the left-right direction, and the region setting means sets a link between the movement detector that detects the movement of the sheet in the left-right direction and the front and rear sheets provided at a predetermined position of the sheet. And a link setting device for setting the grouping area based on the detection output of the movement detector and the setting of the link setting device.
[0012]
Further, for example, the seat can move in the left-right direction and in the front-rear direction, and the region setting means includes a first movement detector that detects the movement in the left-right direction of the sheet, and the movement of the seat in the front-rear direction. And a grouping region is set based on the detection outputs of the first and second movement detectors.
Further, for example, the area setting means includes a setting unit that sets the arrival direction of the noise sound to be canceled provided at a predetermined position of the sheet, and sets the grouping area based on the setting of the setting unit.
[0013]
Then, the control unit controls the canceling sound to be emitted only from the sound emitting unit corresponding to the boundary of the grouping area set by the area setting unit. Thereby, in the grouping area, noise sound from outside the area can be eliminated and conversation can be shared.
[0014]
  The external noise canceling apparatus according to the present invention is provided with a plurality of sound collecting units that collect environmental sounds from a plurality of directions, respectively, and the plurality of sound collecting units. And a plurality of sound emitting units for emitting a canceling sound for canceling the noise sound based on the environmental sound collected by the unit. The sound collection unit includes an acoustoelectric conversion unit that converts the collected environmental sound into an electric signal, and the sound emission unit is output from the output signal of the corresponding acoustoelectric conversion unit of the sound collection unit.By removing the reference audio signal, which is an audio signal in a noise-free situationA noise signal extraction unit that extracts a noise signal corresponding to the noise sound, and a position around the target position in the cancellation signal corresponding to the cancellation sound based on the noise signal extracted by the noise signal extraction unitFor class detectionFirst data selecting means for selecting a plurality of first data, and a plurality of first data selected by the first data selecting meansLevel distribution patternBased on the class detection means for detecting the class to which the data of the target position belongs, and the class detected by the class detection means,Find the data of the position of interest in the cancellation signalEstimation formulaUsed forCoefficient data generating means for generating coefficient data and the noise signal extracted by the noise signal extracting means are located around the position of interest in the cancellation signalPredictiveUsing the second data selecting means for selecting a plurality of second data, the coefficient data generated by the coefficient data generating means, and the plurality of second data selected by the second data selecting means, an estimation formula is used. And calculating means for obtaining the data of the position of interest in the cancellation signal, and electroacoustic conversion means for converting the cancellation signal composed of the data obtained by the calculation means into the cancellation sound.
[0015]
In the present invention, the cancellation signal is generated from the noise signal extracted from the environmental sound signal by the class classification adaptive processing. In this case, the canceling signal can be generated so that the canceling sound emitted by the canceling signal corresponds to the noise sound included in the environmental sound at the time of sound emission. Therefore, it is possible to satisfactorily cancel external noise noise.
[0016]
Here, the sound emission unit further includes parameter input means for inputting a value of a parameter for determining an advance amount of the environmental sound including the noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit. The coefficient data generating means is configured to generate coefficient data of the estimation formula corresponding to the class value detected by the class detecting means and the parameter value input to the parameter input means, whereby the parameter value When the canceling sound corresponding to an arbitrary advance amount can be emitted by adjusting the environmental sound at the sound collection unit and when the canceling sound is emitted based on the collected environmental sound Even if there is a variation in the time difference between
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows a movie theater 10 to which a seat system according to the present invention is applied. The movie theater 10 is provided with a screen 11 on the front, a seat area 12 is provided opposite to the screen 11, and a plurality of seats 13 (seats) are arranged in the seat area 12 in an orderly manner in the front, rear, left and right. (FIG. 1 shows only a part of the sheets 13). In addition, speakers 14 for outputting movie sound are arranged on the front, left side, right side, and back side of the seat area 12, respectively.
[0018]
In the present embodiment, a grouping region (GP region) composed of one or more sheets can be set selectively from the plurality of sheets 13 arranged in the sheet area 12. Then, the canceling sound for canceling the external noise sound is emitted only from the sound emitting part that emits the canceling sound toward the grouping area corresponding to the boundary of the grouping area. Then, noise sounds from outside the area can be eliminated and conversation can be shared.
[0019]
FIG. 2 shows a schematic configuration of the sheet 13. In FIG. 2, the speakers and microphones attached to the seat 13 are shown by solid lines even in the inside of the seat 13.
The seat 13 includes a base portion 13A, a backrest portion 13B connected upward to the rear end of the base portion 13A, an armrest portion 13C connected upward from both ends of the base portion 13A, and the base portion 13A and the backrest portion 13B. The leg part 13D connected to the lower surface of the back part and the arm part 13E rotatably attached to the upper end side surface of the backrest part 13B. The arm portion 13E can selectively take a state parallel to the backrest portion 13B (first state) or a state parallel to the armrest portion 13C (second state).
[0020]
The seat 13 is disposed on a rail 15 for moving the seat 13 in the left-right direction. With respect to the left-right direction, the seat 13 can be moved in three stages: a right position, a center position, and a left position. In this case, even if the position of the sheet 13 is the left position or the right position, the left position and the right position are set so as not to be in close contact with the other adjacent sheets 13.
The rail 15 is provided with a movement detector 16 for detecting whether the position of the seat 13 in the left-right direction is the above-described right position, center position, or left position.
[0021]
In addition, the back portion 13B of the seat 13 has a speaker S directed in the straight rearward direction at the center of the rear surface._BCAnd the speaker S facing the rear diagonal right direction on the right side of the rear surface_BRAnd the speaker S facing diagonally left rearward on the left side of the rear surface_BLAnd the speaker S facing forward straight in the center of the front_FCAnd the speaker S facing the front diagonal left direction on the right side of the front_FRAnd the speaker S facing diagonally forward right on the entire left side_FLAnd are provided. These speakers S_BC, S_BR, S_BL, S_FC, S_FR, S_FLIs an electroacoustic conversion means for emitting a canceling sound for canceling a noise sound.
[0022]
Further, a speaker S is provided on the backrest portion 13B of the seat 13._BC, S_BR, S_BL, S_FC, S_FR, S_FLAnd microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FLIs provided. These microphones M_BC, M_BR, M_BL, M_FC, M_FR, M_FLIs an acoustoelectric conversion means for collecting environmental sounds.
[0023]
Microphone M_BCIs for collecting environmental sound toward the straight back direction. Microphone M_BRIs for collecting environmental sounds heading diagonally right behind. Microphone M_BLIs for collecting environmental sounds that are directed diagonally to the left. Microphone M_FCIs for collecting environmental sounds going straight ahead. Microphone M_FRIs for collecting environmental sound toward the front diagonal left. Microphone M_FLIs for collecting environmental sounds heading diagonally to the right.
[0024]
In addition, the right arm portion 13E of the seat 13 has a speaker S directed leftward on its free end side._RIs provided. Similarly, the left arm portion 13E of the seat 13 has a speaker S directed rightward on its free end side._LIs provided. These speakers S_R, S_LIs an electroacoustic conversion means for emitting a canceling sound for canceling a noise sound.
[0025]
In addition, the arm portion 13E, 13E of the seat 13 has a speaker S._R, S_LAnd microphone M_R, M_LIs provided. These microphones M_R, M_LIs an acoustoelectric conversion means for collecting environmental sounds. Microphone M_RIs for collecting environmental sound toward the left. Microphone M_LIs for collecting environmental sound toward the right.
[0026]
The arm portion 13E is a speaker S_R, S_LAnd microphone M_R, M_LCan be placed in a state parallel to the armrest portion 13C (second state), and in other cases, it can be placed in a state parallel to the backrest portion 13B (first state).
[0027]
Further, a front / rear link switch 17 as a link setting device is provided on the back side of the back portion 13B of the seat 13. The front / rear link switch 17 can be set to three link states: “not linked to any preceding or following sheet”, “link to previous sheet”, or “link to subsequent sheet”. .
[0028]
The front / rear link switch 17 and the movement detector 16 described above constitute grouping area setting means. The setting information of the front / rear link switch 17 and the detection output of the movement detector 16 are supplied to a system controller 30 which will be described later, which controls the noise canceling operation of the plurality of sheets 13 arranged in the seat area 12.
[0029]
Here, a grouping area setting method will be described.
When a grouping area including only one sheet 13 is set, the position of the sheet 13 in the left-right direction is set as the center position, and the link setting with the sheet 13 before and after the sheet 13 is set to “any sheet before or after. Set to "No link". In this case, the left and right arm portions 13E of the seat 13 are set in a state parallel to the armrest portion 13C (second state).
[0030]
Also, when setting a grouping area including the two left and right sheets 13h1, 13h2, the right sheet 13h1 is moved to the left by a predetermined distance d from the center position as shown in FIGS. In addition to the left position, the left sheet 13h2 is moved to the right by a predetermined distance d from the center position, and that position is set as the right position. In this case, the arm portion 13E on the right side of the seat 13h1 and the arm portion 3E on the left side of the seat 13h2 are in a state parallel to the armrest portion 13C (second state). In this case, the link setting of the sheets 13h1 and 13h2 with the preceding and succeeding sheets 13 is set to “not linked with any preceding or following sheet”.
[0031]
Further, when setting a grouping area including 2 left and right 2 × front and rear two sheets 13h11, 13h12, 13h21, and 13h22, as shown in FIGS. 4A and 4B, the front and rear right sheets 13h11 and 13h21 are moved from the center position. The left and right seats 13h12 and 13h22 are moved to the right by a predetermined distance d from the central position, and the position is set to the right position.
[0032]
In this case, the link setting with the front and rear seats 13h11 and 13h12 of the front side seats 13h11 and 13h12 is set to “link with subsequent seats”, and the link setup with the front and rear seats 13 of the rear side seats 13h21 and 13h22 is set. , Set to “Link to previous sheet”. In this case, the right arm portion 13E of the seats 13h11 and 13h21 and the left arm portion 13E of the seats 13h12 and 13h22 are in a state (second state) parallel to the armrest portion 13C.
[0033]
When a grouping area including three or more sheets 13 on the left and right is set, the rightmost sheet 13 is moved to the left by a predetermined distance d from the center position, and that position is set as the left position. Is moved to the right by a predetermined distance d from the center position to set the position to the right position, and the sheet 13 positioned between the left and right directions remains at the center position. In this case, the right arm portion 13E in the rightmost seat 13 and the left arm portion 13E in the leftmost seat 13 are each in a state (second state) parallel to the armrest portion 13C.
[0034]
In this case, the link setting with the front and rear sheets 13 of the frontmost sheet 13 is set to “link with the subsequent sheet” and the link setting with the front and rear sheets 13 of the rearmost sheet 13 is set. Is set to “link with the previous sheet”, and the link setting of the sheet 13 positioned in the front-rear direction with the front and rear sheets 13 is set to “not linked with any preceding or subsequent sheet”.
[0035]
Next, the external noise canceling operation will be described.
FIG. 5 shows an external noise canceling operation in a grouping region including one sheet 13. In this case, the speaker S provided on the front surface of the backrest 13B of the seat 13 under the control of the system controller 30 described later._FR, S_FC, S_FLAnd the speaker S provided on the left and right arm portions 13E_R, S_LAnd a speaker S provided on the rear surface of the backrest 13B of the seat 13 positioned in front of the seat 13_BCAnd a speaker S provided on the rear surface of the backrest portion 13B of the seat 13 positioned in front of the seat 13_BLAnd a speaker S provided on the rear surface of the backrest portion 13B of the seat 13 located on the left front side of the seat 13_BRThe canceling sound is emitted from
[0036]
FIG. 6 shows an external noise canceling operation in the grouping region including the left and right sheets 13h1 and 13h2. In this case, the speaker S provided on the front surface of the backrest portion 13B of the seat 13h1 under the control of the system controller 30 described later._FR, S_FC, S_FLThe speaker S provided on the right arm 13E_RAnd the speaker S provided in front of the backrest 13B of the seat 13h2._FR, S_FC, S_FLThe speaker S provided on the left arm 13E_LAnd a speaker S provided on the rear surface of the backrest 13B of the seat 13 positioned in front of the seat 13h1._BC, S_BLAnd the speaker S provided in the backrest portion 13B of the seat 13 positioned in front of the seat 13h1._BLAnd a speaker S provided on the rear surface of the backrest portion 13B of the seat 13 positioned in front of the seat 13h2._BR, S_BCAnd the speaker S provided in the backrest portion 13B of the seat 13 located on the left front side of the seat 13h2._BRThe canceling sound is emitted from
[0037]
FIG. 7 shows the external noise canceling operation in the grouping region including the left and right, two front and rear sheets 13h11, 13h12, 13h21, and 13h22. In this case, the speaker S provided on the front surface of the backrest portion 13B of the seat 13h21 under the control of the system controller 30 described later._FR, S_FC, S_FLThe speaker S provided on the right arm 13E_RAnd a speaker S provided in front of the backrest 13B of the seat 13h22_FR, S_FC, S_FLThe speaker S provided on the left arm 13E_LAnd the speaker S provided in the backrest portion 13B of the seat 13 located in front of the seat 13h21._BLAnd the speaker S provided in the backrest portion 13B of the seat 13 located on the left front side of the seat 13h22_BRAnd a speaker S provided in front of the seat 13h11_FRAnd the speaker S provided on the arm 13E on the right side thereof_RAnd a speaker S provided in front of the seat 13h12_FLAnd a speaker S provided on the left arm 13E._LAnd a speaker S provided on the rear surface of the backrest 13B of the seat 13 located in front of the seat 13h11._BC, S_BLAnd the speaker S provided in the backrest portion 13B of the seat 13 located in front of the seat 13h11._BLAnd a speaker S provided on the rear surface of the backrest 13B of the seat 13 located in front of the seat 13h12_BR, S_BCAnd the speaker S provided in the backrest part 13B of the seat 13 located in front of the seat 13h12._BRThe canceling sound is emitted from
[0038]
Although detailed description is omitted, the external noise canceling operation in the other grouping areas is similarly performed under the control of the system controller 30 described later. In other words, the canceling sound is emitted only from the speaker corresponding to the boundary of the grouping area and emitting the canceling sound toward the grouping area. Thereby, within the grouping area, noise sounds from outside the area can be eliminated and conversation can be shared.
[0039]
As described above, the detection output of the movement detector 16 of each seat 13 and the setting information of the front / rear link switch 17 are sent to a system controller 30 (to be described later) that controls the noise canceling operation in the plurality of seats 13 arranged in the seat area 12. While being supplied, the noise canceling operation in each sheet 13 is controlled by the control of the system controller 30.
[0040]
Next, with reference to FIG. 8, a circuit configuration related to the noise canceling operation in the plurality of sheets 13 arranged in the sheet area 12 will be described.
A sheet circuit unit 20 is provided corresponding to each sheet 13. The system controller 30 controls the operation of each sheet circuit unit 20. The system controller 30 is disposed at a position different from the sheet area 12 where a plurality of sheets 13 are arranged, for example. Connected to the system controller 30 are an operation unit 31 for an operator to perform various operations, a display unit 32 for displaying a grouping area setting state, and a storage device 33 such as an HDD (Hard Disk Drive). Has been.
[0041]
In the storage device 33, as will be described later, an audio signal used when extracting a noise signal from the output signal of each microphone, that is, an audio signal in a situation without noise sound (hereinafter referred to as "reference audio signal"). Are recorded in advance by each microphone. This reference audio signal is composed of a signal component that does not include any signal component corresponding to the audience's conversational audio or the like and that corresponds purely to movie audio. The reference audio signals are recorded in advance in the storage device 33 by the number of microphones.
[0042]
The configuration of the sheet circuit unit 20 will be described.
The sheet circuit unit 20 includes eight speakers S._BC, S_BR, S_BL, S_FC, S_FR, S_FL, S_R, S_LAnd 8 microphones M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LAnd have.
[0043]
The seat circuit unit 20 includes eight microphones M._BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LEight difference calculators 21 for extracting noise signals from the output signals of_-1~ 21_-8have. These eight difference calculators 21_-1~ 21_-8Each has a microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LThe reference audio signal S corresponding to the signal component of the movie audio included in the output signal of_RAIs supplied from the system controller 30. The system controller 30 is supplied with a timing signal TS for synchronizing with the movie sound output from the speaker 14 (see FIG. 1).
[0044]
Based on the timing signal TS, the system controller 30 performs microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LCorresponding reference audio signal S at a timing synchronized with the signal component of the movie audio included in the output signal of_RAAre respectively read from the storage device 33 and the difference calculator 21 is read out._-1~ 21_-8To supply.
[0045]
Eight difference calculators 21_-1~ 21_-8Then, microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LFrom the output signal of the reference audio signal S_RAIs subtracted, the noise signal S corresponding to the noise sound_NZIs extracted.
[0046]
The sheet circuit unit 20 includes eight difference calculators 21._-1~ 21_-8Noise signal S extracted in each_NZCanceling signal S corresponding to the canceling sound based on_-NZ, And each speaker S_BC, S_BR, S_BL, S_FC, S_FR, S_FL, S_R, S_L8 noise signal prediction circuits 22 to be supplied to_-1~ 22_-8have. In this case, the cancellation signal S_-NZThe canceling signal S so that the canceling sound emitted by the sound corresponds to the noise sound included in the environmental sound at the time of the sounding._-NZIs generated. Thereby, the noise sound contained in environmental sound can be canceled favorably.
[0047]
Each noise signal prediction circuit 22_-1~ 22_-8Includes a microphone M from the system controller 30._BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LThe value of the parameter h that determines the advance time α of the environmental sound that includes the noise sound that should be canceled by the canceling sound with respect to the environmental sound collected at is input. By adjusting the value of this parameter h, a canceling sound corresponding to an arbitrary advance time α can be emitted, and the microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FL, M_R, M_LThe speaker S is based on the collected environmental sound from the time when the environmental sound is collected at_BC, S_BR, S_BL, S_FC, S_FR, S_FL, S_R, S_LEven if there is a variation in the time α from when the canceling sound is emitted to when the canceling sound is emitted, it can be dealt with.
[0048]
The seat circuit unit 20 includes a movement detection unit 16 that detects the position of the seat 13 in the left-right direction, and a front / rear link switch 17 for setting a link between the front and rear seats 13. The setting information of the front / rear link switch 17 and the detection output of the movement detector 16 are supplied to the system controller 30. The system controller 30 recognizes the setting of the grouping area based on the setting information of the front / rear link switch 17 of each seat 13 and the detection output of the movement detector 16, corresponds to the boundary of the grouping area, and moves toward the grouping area. Control is performed so that the canceling sound is emitted only from the speaker that emits the canceling sound. For example, in order to prevent the canceling sound from being emitted from a certain speaker, the canceling signal S is provided on the output side of the noise signal prediction circuit corresponding to the speaker._-NZIs not output.
[0049]
FIG. 9 is a conceptual diagram showing a noise noise canceling operation.
That is, the environmental sound at the time point T-α is input to the microphone M, and the output signal of the microphone M is supplied to the difference calculator 21. The difference calculator 21 receives a reference sound signal S corresponding to the movie sound included in the environmental sound at the time point T-α._RAIs supplied, and a difference calculation with the output signal of the microphone M is performed. Thereby, the difference calculator 21 outputs the noise signal S corresponding to the noise sound included in the environmental sound at the time T-α._NZ(T-α) is obtained.
[0050]
The noise signal S obtained by the difference calculator 21 in this way._NZ(T−α) is supplied to the noise signal prediction circuit 22. In the noise signal prediction circuit 22, the noise signal S at the input time point T-α._NZFrom (T-α), the noise signal S at a future time T_NZCancellation signal S with the phase of (T) inverted_-NZ(T) is generated. And this cancellation signal S_-NZ(T) is supplied to the speaker S.
[0051]
Thereby, when the environmental sound at the time T reaches the user's ear 40, the canceling sound corresponding to the noise sound at the time T reaches the user's ear 40 from the speaker S. Therefore, at the position of the user's ear 40, the noise sound is canceled out from the environmental sound, and the user can listen to only the movie sound included in the environmental sound.
[0052]
Next, details of the noise signal prediction circuit 22 will be described.
FIG. 10 shows the configuration of the noise signal prediction circuit 22. The noise signal predicting circuit 22 is connected to the noise signal S._NZThe input terminal 101 for inputting (T-α) and the noise signal S_NZAn A / D converter 102 that samples (T-α) at a predetermined sampling frequency and converts it into a digital signal, and a noise signal S as a digital signal output from the A / D converter 102_NZAnd a buffer memory 103 for temporarily storing (T-α).
[0053]
The noise signal prediction circuit 22 also includes a noise signal S stored in the buffer memory 103._NZFrom (T-α), the cancellation signal S to be created_-NZA first tap selection circuit 104 and a second tap selection circuit 105 that selectively extract and output a plurality of sampling data located around the target position in (T) are provided. The first tap selection circuit 104 selectively extracts data used for prediction (prediction tap data). The second tap selection circuit 105 selectively extracts data used for class classification (class tap data).
[0054]
Further, the noise signal prediction circuit 22 detects a level distribution pattern from the data selectively extracted by the second tap selection circuit 105 as a feature amount, and generates a class code CL based on the level distribution pattern. 106.
[0055]
  In this class detection circuit 106, for example, an operation is first performed to compress each 8-bit data into 2 bits. Here, data compression is performed by ADRC. In this case, assuming that the maximum value of each data is MAX, the minimum value is MIN, the dynamic range is DR (= MAX−MIN + 1), and the number of requantization bits is P, each data With respect to ki, the requantized code qi as compressed data is obtained by the calculation of equation (1). However, in the expression (1), [] means a truncation process. Second tap selection circuit105When the number of data selected in (1) is Na, i = 1 to Na.
  qi = [(ki-MIN + 0.5) * 2^P/ DR] (1)
[0056]
Next, in the class detection circuit 106, based on the requantization code qi obtained as described above, the cancellation signal S to be generated by the equation (2)._-NZA class code CL indicating the class to which the data of the target position in (T) belongs is calculated.
[0057]
[Expression 1]

[0058]
The noise signal prediction circuit 22 includes a coefficient memory 107. The coefficient memory 107 stores coefficient data of an estimation formula used in an estimated prediction calculation circuit 110 described later for each class. This coefficient data is the noise signal S_NZ(T-α) is canceled signal S_-NZInformation for converting to (T). The coefficient memory 107 is supplied with the class code CL output from the class detection circuit 106 described above as read address information. Coefficient data Wi corresponding to the class code CL is read from the coefficient memory 107 and supplied to the estimated prediction calculation circuit 110.
[0059]
Further, the noise signal prediction circuit 22 has an information memory bank 108. In the estimated prediction calculation circuit 110 to be described later, the canceling signal S to be generated from the prediction tap data xi and the coefficient data Wi read from the coefficient memory 107 by the estimation expression (3)._-NZThe data y of the target position of (T) is calculated. In Expression (3), n represents the number of prediction taps selected by the first tap selection circuit 104.
[0060]
[Expression 2]

[0061]
Then, the coefficient data Wi (i = 1 to n) of the estimation formula is generated by a generation formula including a parameter h as shown in, for example, the formula (4). In the information memory bank 108, coefficient seed data w which is coefficient data in this generation formula is stored._i0~ W_i3Is stored for each class. A method for generating the coefficient seed data will be described later.
[0062]
[Equation 3]

[0063]
  Further, the noise signal prediction circuit 22 uses the coefficient seed data of each class and the value of the parameter h, and the coefficient data Wi (i = i = 1 to n) is generated. The coefficient generation circuit 109 is loaded with the above-described coefficient seed data of each class from the information memory bank 108. The coefficient generation circuit 109 has a system controller.LaFrom 30 (see FIG. 8), the value of the parameter h is supplied.
[0064]
The coefficient data Wi (i = 1 to n) of each class generated by the coefficient generation circuit 109 is stored in the coefficient memory 107 described above. The generation of coefficient data Wi for each class in the coefficient generation circuit 109 is performed each time the value of the parameter h is changed.
[0065]
Further, the noise signal prediction circuit 22 uses (3) the prediction tap data xi selectively extracted by the first tap selection circuit 104 and the coefficient data Wi read from the coefficient memory 107 based on the class code CL. The cancellation signal S to be generated by the estimation equation_-NZAn estimated prediction calculation circuit 110 that calculates the data y of the target position in (T) is provided.
[0066]
The noise signal prediction circuit 22 also cancels the signal S as a digital signal composed of data y sequentially output from the estimated prediction calculation circuit 110._-NZA D / A converter 111 that converts (T) into an analog signal, and an offset signal S converted into an analog signal_-NZAnd an output terminal 112 for outputting (T).
[0067]
Next, the operation of the noise signal prediction circuit 22 will be described.
Noise signal S stored in buffer memory 103_NZFrom (T-α), the second tap selection circuit 105 generates the cancellation signal S to be generated._-NZData of the class tap located around the target position in (T) is selectively extracted. The class tap data selectively extracted by the second tap selection circuit 105 is supplied to the class detection circuit 106. The class detection circuit 106 detects a level distribution pattern from the class tap data as a feature amount, and based on this level distribution pattern, obtains a class code CL indicating the class to which the data of the noted position belongs ((2)). See formula).
[0068]
  This class code CL is supplied to the coefficient memory 107 as read address information. The coefficient memory 107 stores the coefficient seed data w for each class in the coefficient generation circuit 109 corresponding to the value of the parameter h._i0~ W_{i 3} Is used to obtain and store coefficient data Wi (i = 1 to n) of the estimation formula (see formula (4)). As described above, the class code CL is supplied to the coefficient memory 107 as read address information, so that the coefficient data Wi of the estimation formula corresponding to the class code CL is read from the coefficient memory 107 and supplied to the estimated prediction calculation circuit 110. Supplied.
[0069]
In addition, the noise signal S stored in the buffer memory 103_NZFrom (T-α), the first tap selection circuit 104 generates the cancellation signal S to be generated._-NZData of prediction taps located around the target position in (T) is selectively extracted. The estimated prediction calculation circuit 110 uses the prediction tap data xi and the coefficient data Wi read from the coefficient memory 109 to generate the cancellation signal S to be generated based on the estimation expression of the expression (3)._-NZThe data y of the position of interest in (T) is calculated.
[0070]
Then, the cancellation signal S composed of data y sequentially calculated by the estimated prediction calculation circuit 110._-NZ(T) is converted to an analog signal by the D / A converter 111 and then output to the output terminal 112.
[0071]
As described above, the noise signal prediction circuit 22 uses the coefficient data Wi (i = 1 to n) of the estimation formula corresponding to the value of the parameter h to cancel the cancellation signal S._-NZThe data y of the position of interest in (T) is calculated. Therefore, by adjusting the value of the parameter h, an arbitrary advance time α can be obtained by setting an arbitrary advance time of the environmental sound including the noise sound to be canceled by the canceling sound to α with respect to the environmental sound collected by the microphone M. Canceling signal S that can emit canceling sound corresponding to_-NZ(T) can be obtained. Further, the coefficient data Wi for each class corresponding to the value of the parameter h is generated and used by the coefficient generation circuit 109, and a memory for storing a large amount of coefficient data is not necessary, thereby saving memory. Can do.
[0072]
Next, an example of a method for generating coefficient seed data will be described. Here, coefficient seed data w which is coefficient data in the generation formula of the above-described formula (4)_i0~ W_i3An example of obtaining (i = 1 to n) is shown. Here, for the following explanation, tj (j = 0 to 3) is defined as in equation (5).
t₀= 1, t₁= H, t₂= H², T_Three= H^Three      ... (5)
Using this equation (5), equation (4) can be rewritten as equation (6).
[0073]
[Expression 4]

[0074]
Finally, the undetermined coefficient w_ijAsk for. That is, for each class, a plurality of noise signals S_NZStudent signal data and cancellation signal S corresponding to (T-α)_-NZThe coefficient value that minimizes the square error is determined using the teacher signal data corresponding to (T). This is a so-called least square method. The learning number is m, and the residual in the k-th learning data (1 ≦ k ≦ m) is e._kIf the sum of square errors is E, E is expressed by equation (7) using equations (3) and (4). Where x_ikIs the k-th data at the i-th predicted tap position of the student signal, y_kRepresents the data of the k-th teacher signal corresponding thereto.
[0075]
[Equation 5]

[0076]
In the least squares method, w in equation (7)_ijW such that the partial differential due to becomes zero_ijAsk for. This is shown by equation (8).
[0077]
[Formula 6]

[0078]
Hereinafter, X (X) as in (9) and (10)_ipjq, Y_ipIs defined, equation (8) can be rewritten using a matrix like equation (11).
[0079]
[Expression 7]

[0080]
[Equation 8]

[0081]
This equation is generally called a normal equation. This normal equation can be calculated using the sweep-out method (Gauss-Jordan elimination method), etc._ijThe coefficient seed data is calculated.
[0082]
FIG. 11 shows an example of the concept of the above-described coefficient seed data generation method. Offset signal S_-NZFrom the teacher signal corresponding to (T), the noise signal S_NZA plurality of student signals corresponding to (T-α) are generated. For example, the parameter h for changing the delay time α is varied in nine stages, and nine types of student signals are generated. The coefficient seed data is generated by performing learning between the plurality of student signals and the teacher signal generated as described above.
[0083]
FIG. 12 shows coefficient seed data w stored in the information memory bank 108 of the noise signal prediction circuit 22 described above._Ten~ W_n32 shows the configuration of the coefficient seed data generation device 150 for generating.
[0084]
The coefficient seed data generation device 150 is configured to cancel the cancellation signal S._-NZAn input terminal 151 to which a teacher signal ST (digital signal) corresponding to (T) is input, and a noise signal S by performing a delay and inversion process on the teacher signal ST._NZA delay inversion circuit 152 for obtaining a student signal SS corresponding to (T-α). The delay inversion circuit 152 receives the value of the parameter h corresponding to the value of the parameter h in the noise signal prediction circuit 22 (see FIG. 10). In the delay inversion circuit 152, the delay time α is varied based on the parameter h.
[0085]
Further, the coefficient seed data generation device 150 selectively extracts a plurality of pieces of data located around the position of interest in the teacher signal ST from the student signal SS output from the delay inversion circuit 152 and outputs the first tap selection. A circuit 153 and a second tap selection circuit 154 are included. The first and second tap selection circuits 153 and 154 are configured in the same manner as the first and second tap selection circuits 104 and 105 of the noise signal prediction circuit 22 described above, respectively.
[0086]
Further, the coefficient seed data generation device 150 detects a level distribution pattern as a feature amount from the class tap data selectively extracted by the second tap selection circuit 105, and based on this level distribution pattern, A class detection circuit 155 that generates a class code CL indicating the class to which the data of the target position belongs is provided. The class detection circuit 155 is configured in the same manner as the class detection circuit 106 of the noise signal prediction circuit 22 described above.
[0087]
Further, the coefficient seed data generation device 150 selectively selects each data y of the target position obtained from the teacher signal ST supplied to the input terminal 151 and the first tap selection circuit 153 corresponding to each data y. The coefficient seed data w for each class using the prediction tap data xi, the value of the parameter h, and the class code CL generated by the class detection circuit 155 corresponding to each data y._Ten~ W_n3A normal equation generation unit 156 that generates a normal equation (see equation (11)) for obtaining
[0088]
In this case, one learning data is generated by a combination of one data y and n prediction tap data xi (i = 1 to n) corresponding to the data y, but it corresponds to a change in the value of the parameter h. Then, the delay time α in the delay inverting circuit 152 is varied, and a plurality of student signals SS are sequentially generated, and learning data is generated between the teacher signal ST and each student signal SS. As a result, the normal equation generation unit 156 generates a normal equation in which many learning data having different values of the parameter h are registered, and the coefficient seed data w_Ten~ W_n3Can be obtained.
[0089]
Further, the coefficient seed data generation device 150 is supplied with data of normal equations generated for each class by the normal equation generation unit 156, solves the normal equations, and generates coefficient seed data w for each class._Ten~ W_n3The coefficient seed data determining unit 157 for calculating the coefficient seed data w_Ten~ W_n3Is stored in the coefficient seed memory 158. In the coefficient seed data determination unit 157, the normal equation is solved by, for example, a sweeping out method or the like to obtain coefficient seed data.
[0090]
The operation of the coefficient seed data generation device 150 shown in FIG. 12 will be described.
The input terminal 151 has a cancellation signal S_-NZA teacher signal ST (digital signal) corresponding to (T) is supplied, and a delay inversion circuit 152 performs a delay inversion process on the teacher signal ST, and the noise signal S_NZA student signal SS corresponding to (T-α) is generated. In this case, the value of the parameter h corresponding to the value of the parameter h in the noise signal prediction circuit 22 (see FIG. 10) is input to the delay inverting circuit 152. In the delay inversion circuit 152, the delay time α is varied based on the parameter h.
[0091]
Further, from the student signal SS generated by the delay inverting circuit 152, the second tap selection circuit 154 selectively extracts data of class taps located around the target position in the teacher signal ST. The class tap data is supplied to the class detection circuit 155. In this class detection circuit 155, a level distribution pattern is detected as a feature quantity from the class tap data, and based on this level distribution pattern, a class code CL indicating the class to which the data of the target position in the teacher signal ST belongs is generated. .
[0092]
Further, from the student signal SS generated by the delay inversion circuit 152, the first tap selection circuit 153 selectively extracts data of predicted taps located around the target position in the teacher signal ST.
[0093]
Then, each data y of the target position obtained from the teacher signal ST supplied to the input terminal 151, and predicted tap data xi selectively extracted by the first tap selection circuit 153 corresponding to each data y. And the value of the parameter h and the class code CL generated by the class detection circuit 155 corresponding to each data y, the normal equation generation unit 156 uses the coefficient seed data w for each class._Ten~ W_n3A normal equation (see equation (11)) is obtained.
[0094]
  Then, the coefficient seed data determination unit 157 solves each normal equation, and the coefficient seed data w for each class._Ten~ W_n3Are obtained, and their coefficient seed data w_Ten~ W_{n 3} Is stored in the coefficient seed memory 158.
[0095]
As described above, in the coefficient seed data generation device 150 shown in FIG. 12, it is used in the estimation formula (see formula (3)) for each class stored in the information memory bank 108 of the noise signal prediction circuit 22 in FIG. 10. Coefficient seed data w which is coefficient data in a generation formula (see formula (4)) for determining the coefficient data Wi to be obtained_Ten~ W_n3Can be generated.
[0096]
In the above-described practical form, the system controller 30 has shown the one that recognizes the setting of the grouping area based on the setting information of the front / rear link switch 17 of each seat 13 and the detection output of the movement detector 16. Instead of providing the front / rear link switch 17 on the seat 13, each seat 13 can be moved in, for example, three stages in the front / rear direction, and a movement detector for detecting the movement is provided. These movement detection outputs may be supplied to the system controller 30, and the system controller 30 may recognize the setting of the grouping area based only on those movement detection outputs.
[0097]
In the above-described embodiment, the sheet area 12 has the sheet 13 arranged as shown in FIG. 2, but the sheet area 12 has the sheet 23 as shown in FIG. Good. In FIG. 13, portions corresponding to those in FIG. In FIG. 13 as well, the speakers and microphones attached to the seat 23 are indicated by solid lines even if they are inside the seat 23.
[0098]
The seat 23 is connected to the base portion 23A, a back portion 23B that is connected to the rear end of the base portion 23A, and has a cross-sectional shape that protrudes rearward, and is connected upward from both ends of the base portion 23A. It consists of an armrest 23C and a leg 23D connected to the lower surface of the base 23A and the backrest 23B.
[0099]
The seat 23 is disposed on a rail 15 for moving the seat 23 in the left-right direction. With respect to the left-right direction, the seat 23 can be moved in three stages: a right position, a center position, and a left position. In this case, even if the position of the sheet 23 is the left position or the right position, the left position and the right position are set so as not to be in close contact with the other adjacent sheets 13.
[0100]
In addition, the back portion 23B of the seat 23 has a speaker S directed in the straight rearward direction at the center of the rear surface._BCAnd the speaker S facing the rear diagonal right direction on the right side of the rear surface_BRAnd the speaker S facing diagonally left rearward on the left side of the rear surface_BLAnd the speaker S facing forward straight in the center of the front_FCAnd the speaker S facing the front diagonal left direction on the right side of the front_FRAnd the speaker S facing diagonally forward right on the entire left side_FLAnd are provided. These speakers S_BC, S_BR, S_BL, S_FC, S_FR, S_FLIs an electroacoustic conversion means for emitting a canceling sound for canceling a noise sound.
[0101]
Further, a speaker S is placed on the backrest portion 23B of the seat 23._BC, S_BR, S_BL, S_FC, S_FR, S_FLAnd microphone M_BC, M_BR, M_BL, M_FC, M_FR, M_FLIs provided. These microphones M_BC, M_BR, M_BL, M_FC, M_FR, M_FLIs an acoustoelectric conversion means for collecting environmental sounds.
[0102]
Microphone M_BCIs for collecting environmental sound toward the straight back direction. Microphone M_BRIs for collecting environmental sounds heading diagonally right behind. Microphone M_BLIs for collecting environmental sounds that are directed diagonally to the left. Microphone M_FCIs for collecting environmental sounds going straight ahead. Microphone M_FRIs for collecting environmental sound toward the front diagonal left. Microphone M_FLIs for collecting environmental sounds heading diagonally to the right.
[0103]
In addition, a speaker S facing leftward is located at the right end of the backrest 23B of the seat 23._RIs provided. Similarly, at the left end of the backrest portion 23B of the seat 23, the speaker S directed in the right direction is provided._LIs provided. These speakers S_R, S_LIs an electroacoustic conversion means for emitting a canceling sound for canceling a noise sound.
[0104]
Further, a speaker S is placed on the right and left ends of the backrest 13B of the seat 13._R, S_LAnd microphone M_R, M_LIs provided. These microphones M_R, M_LIs an acoustoelectric conversion means for collecting environmental sounds. Microphone M_RIs for collecting environmental sound toward the left. Microphone M_LIs for collecting environmental sound toward the right.
[0105]
A control panel 25 is provided on the back side of the backrest 13B of the seat 13. FIG. 14 shows a specific configuration of the control panel 25. The control panel 25 has eight operation keys 26 used when the user makes settings so as to cancel noise sounds from eight directions toward the seat 23._-1~ 26_-8Is arranged. By repeatedly pressing each operation key, the cancellation setting can be alternately turned on (ON) and off (OFF). In addition, a light emitting element is disposed in each operation key portion, and is turned on in the on state and turned off in the off state. The control panel 25 constitutes grouping area setting means. The cancellation setting information by each operation key of the control panel 25 is supplied to a system controller 30 (see FIG. 8) that controls the noise cancellation operation in the plurality of sheets 23 arranged in the sheet area 12.
[0106]
Based on the cancellation setting information from the control panel 25 of each sheet 23, the system controller 30 emits the cancellation sound only from the speaker corresponding to the boundary of the grouping area and emitting the cancellation sound toward the grouping area. Will be controlled. Thereby, in the grouping area, noise sound from outside the area can be eliminated and conversation can be shared.
[0107]
In the above-described embodiment, the grouping area is set based on the settings of the horizontal movement detector 16 and the front / rear link switch 17 corresponding to each sheet 13. It may be arbitrarily settable by operation.
[0108]
Further, in the noise signal prediction circuit 22 in the above-described embodiment, the coefficient generation circuit 109 performs coefficient seed data w for each class._Ten~ W_n3Is used to generate coefficient data Wi (i = 1 to n) of each class corresponding to the value of the parameter h and store it in the coefficient memory 107. For example, in the information memory bank 108 Coefficient data Wi (i = 1 to n) of each class corresponding to each value of the parameter h is stored in advance, and coefficient data Wi (i = i = i) of each class corresponding to the value of the parameter h is stored from the information memory bank 108. 1 to n) may be read out and stored in the coefficient memory 107 for use.
[0109]
Further, in the noise signal prediction circuit 22 in the above-described embodiment, the cancellation signal S_-NZAlthough the example using the linear linear equation as an estimation formula when generating the data y of the position of interest in (T) is given, it is not limited to this. For example, a higher order equation may be used as the estimation formula. Conceivable.
[0110]
Further, in the above-described embodiment, it is assumed that the front and rear seats 13 and 13 are arranged on the same plane as shown in FIG. 15A. However, the present invention can be similarly applied to those arranged stepwise as shown in FIG. 15B. In that case, the direction of the speaker S and the microphone M facing in the front-rear direction attached to the backrest portion 13B of the seat 13 may be, for example, a direction along the inclination of the stairs.
[0111]
【The invention's effect】
  According to the seat system of the present invention, it is possible to set a grouping area composed of one or more sheets, and canceling sound that cancels external noise sound from only the sound emission part corresponding to the boundary of the grouping area. In the grouping area, noise sounds from outside the area can be eliminated and conversation can be shared.The canceling sound is generated from the canceling signal obtained by using the class classification adaptive process on the noise signal extracted from the environmental sound signal.
[0112]
In addition, according to the external noise canceling apparatus according to the present invention, the plurality of sound collecting units that collect environmental sounds from a plurality of directions, respectively, and the plurality of sound collecting units are provided in pairs, respectively. Equipped with multiple sound emission units that emit canceling sounds for canceling noise sounds based on environmental sounds collected by the sound collection unit, and canceling the noise signals extracted from the environmental sound signals by class classification adaptive processing The configuration is such that a signal is obtained, and external noise noise can be canceled well.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a movie theater to which a seat system according to the present invention is applied.
FIG. 2 is a diagram illustrating a schematic configuration of a sheet.
FIG. 3 is a conceptual diagram of grouping (number of sheets: left and right 2).
FIG. 4 is a conceptual diagram of grouping (number of sheets: left and right 2 × front and rear 2).
FIG. 5 is a diagram for explaining an external noise canceling operation (number of sheets: 1).
FIG. 6 is a diagram for explaining an external noise canceling operation (number of sheets: left and right 2).
FIG. 7 is a diagram for explaining an external noise canceling operation (number of sheets: left and right 2 × front and rear 2).
FIG. 8 is a block diagram showing a circuit configuration related to a noise canceling operation.
FIG. 9 is a conceptual diagram showing noise noise canceling operation.
FIG. 10 is a block diagram illustrating a configuration of a noise signal prediction circuit.
FIG. 11 is a diagram for explaining a method of generating coefficient seed data.
FIG. 12 is a block diagram illustrating a configuration of a coefficient seed data generation device.
FIG. 13 is a diagram illustrating another schematic configuration of a sheet.
FIG. 14 is a diagram showing a specific configuration of a control panel.
FIG. 15 is a diagram illustrating an example of an arrangement surface in the front-rear direction of a seat.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Movie theater, 12 ... Seat area, 13, 23 ... Seat, 13A ... Base, 13B ... Backrest part, 13C ... Armrest part, 13E ... Arm part, 15 ... Rail, 16 ... Movement detector, 17 ... Front / rear link switch, 20 ... Seat circuit part, 21, 21_-1~ 21_-8... Difference calculator, 22, 22_-1~ 22_-8... Noise signal prediction circuit, 30 ... System controller, 31 ... Operation unit, 32 ... Display unit, 33 ... Storage device, 101 ... Input terminal, 103 ... Buffer memory, 104: First tap selection circuit, 105: Second tap selection circuit, 106: Class detection circuit, 107: Coefficient memory, 108: Information memory bank, 109: Coefficient Generation circuit 110 ... Estimated prediction calculation circuit 112 ... Output terminal 150 ... Coefficient seed data generation device 151 ... Input terminal 152 ... Delay inversion circuit 153 ... First Tap selection circuit, 154... Second tap selection circuit, 155... Class detection circuit, 156... Normal equation generation unit, 157.

Claims (7)

A plurality of sound collection units that collect environmental sounds from a plurality of directions, respectively, and a reference sound signal that is a sound signal that is collected by the plurality of sound collection units and that is free from noise and noise A plurality of sound emitting portions each for emitting a canceling sound for canceling a noise sound based on the plurality of sheets,
An area setting means for setting a grouping area including one or more sheets from the plurality of sheets;
Control means corresponding to the boundary of the grouping area set by the area setting means, and controlling so as to emit the canceling sound only from the sound emitting unit that emits the canceling sound toward the grouping area ,
The sound collection unit has an acoustoelectric conversion means for converting the collected environmental sound into an electric signal,
The sound emission part is
Noise signal extraction means for extracting a noise signal corresponding to the noise sound by removing the reference sound signal from the output signal of the corresponding acoustoelectric conversion means of the sound collection unit;
Based on the noise signal extracted by the noise signal extraction means, first data selection means for selecting a plurality of first data for class detection located around the position of interest in the cancellation signal corresponding to the cancellation sound When,
Class detecting means for detecting a class to which the data of the target position belongs based on the level distribution pattern of the plurality of first data selected by the first data selecting means;
Coefficient data generating means for generating coefficient data used for an estimation formula for obtaining data of a position of interest in the cancellation signal corresponding to the class detected by the class detecting means;
Based on the noise signal extracted by the noise signal extraction means, second data selection means for selecting a plurality of second data for prediction located around the position of interest in the cancellation signal;
An operation for obtaining the data of the position of interest in the cancellation signal based on the estimation formula using the coefficient data generated by the coefficient data generation means and the plurality of second data selected by the second data selection means. Means,
A seat system comprising: an electroacoustic conversion means for converting a cancellation signal comprising data obtained by the calculation means into a cancellation sound . The seat can be moved in the left-right direction,
The area setting means includes
A movement detector for detecting movement of the sheet in the left-right direction;
A link setting device for setting a link with the front and rear seats provided at a predetermined position of the seat;
Based on the setting of the detection output and the link setting unit of the motion detector, seat system according to 請 Motomeko 1 to set the grouping area. The seat can move in the left-right direction and in the front-rear direction,
The area setting means includes
A first movement detector for detecting movement of the sheet in the left-right direction;
A second movement detector that detects movement of the seat in the front-rear direction;
Based on the detection output of the detection output and the second motion detector of said first motion detector, seat system according to 請 Motomeko 1 to set the grouping area. The area setting means includes
A setter provided at a predetermined position of the sheet, for setting the direction of arrival of the noise sound to be canceled;
Based on the setting of the setting device, the seat system according to 請 Motomeko 1 to set the grouping area. The sound emission unit further includes parameter input means for inputting a value of a parameter for determining an advance amount of the environmental sound including the noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit. Have
It said coefficient data generation means, the sheet system according to 請 Motomeko 1 that occur corresponding to the value of the parameters entered to the detected class and the parameter input means by the class detection means, the coefficient data of the estimation equation . A plurality of sound collecting sections for collecting environmental sounds from a plurality of directions,
A plurality of sound emitting units provided in pairs with the plurality of sound collecting units, each configured to emit a canceling sound for canceling a noise sound based on the environmental sound collected by the plurality of sound collecting units; With
The sound collection unit has an acoustoelectric conversion means for converting the collected environmental sound into an electric signal,
The sound emission part is
Noise signal extraction means for extracting a noise signal corresponding to the noise sound by removing a reference sound signal that is an audio signal under a condition without noise sound from the corresponding output signal of the acoustoelectric conversion means of the sound collecting unit When,
Based on the noise signal extracted by the noise signal extraction means, first data selection means for selecting a plurality of first data for class detection located around the position of interest in the cancellation signal corresponding to the cancellation sound When,
Class detecting means for detecting a class to which the data of the target position belongs based on the level distribution pattern of the plurality of first data selected by the first data selecting means;
Coefficient data generating means for generating coefficient data used for an estimation formula for obtaining data of a position of interest in the cancellation signal corresponding to the class detected by the class detecting means;
Based on the noise signal extracted by the noise signal extraction means, second data selection means for selecting a plurality of second data for prediction located around the position of interest in the cancellation signal;
An operation for obtaining the data of the position of interest in the cancellation signal based on the estimation formula using the coefficient data generated by the coefficient data generation means and the plurality of second data selected by the second data selection means. Means,
External noise cancellation apparatus that have a and electro-acoustic conversion means for converting the cancellation signal comprising data obtained by the calculating means into canceling sound. The sound emission unit further includes parameter input means for inputting a value of a parameter for determining an advance amount of the environmental sound including the noise sound to be canceled by the canceling sound with respect to the environmental sound collected by the sound collecting unit. Have
It said coefficient data generation means, corresponding to the value of the parameters entered to the detected class and the parameter input means by the class detection means, an external noise according to 請 Motomeko 6 that occur the coefficient data of the estimated equation Counterbalance device.

Images