JP6276957B2 - Intercom system - Google Patents
Intercom system Download PDFInfo
- Publication number
- JP6276957B2 JP6276957B2 JP2013207047A JP2013207047A JP6276957B2 JP 6276957 B2 JP6276957 B2 JP 6276957B2 JP 2013207047 A JP2013207047 A JP 2013207047A JP 2013207047 A JP2013207047 A JP 2013207047A JP 6276957 B2 JP6276957 B2 JP 6276957B2
- Authority
- JP
- Japan
- Prior art keywords
- transmission signal
- line
- branch line
- main
- trunk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims description 193
- 238000001514 detection method Methods 0.000 claims description 45
- 230000003321 amplification Effects 0.000 claims description 33
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 33
- 238000004804 winding Methods 0.000 claims description 21
- 230000008054 signal transmission Effects 0.000 claims description 7
- 238000012937 correction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 10
- 238000011144 upstream manufacturing Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 238000007493 shaping process Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Dc Digital Transmission (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Description
本発明は、インターホンシステムに係り、特に、幹線と分岐線との分岐点に挿入される分岐器を備えるインターホンシステムに関する。 The present invention relates to an interphone system, and more particularly to an interphone system including a branching device inserted at a branch point between a trunk line and a branch line.
従来から、この種のインターホンシステムとして、図４に示すように、主装置Ｓ１０から延線される幹線Ｌ１０と、幹線Ｌ１０から分岐されて複数の端末器２０ａ、２０ｂ、・・・、２０ｎにそれぞれ接続される複数の分岐線Ｌ２０ａ、Ｌ２０ｂ、・・・、Ｌ２０ｎと、主装置１０及び端末器２０ａ、２０ｂ、・・・、２０ｎ間で信号伝送を行うにあたり幹線Ｌ１０及び複数の分岐線Ｌ２０ａ、Ｌ２０ｂ、・・・、Ｌ２０ｎ間にそれぞれ挿入される複数の分岐器３０ａ、３０ｂ、・・・、３０ｎとを有するインターホンシステムが知られている（例えば、特許文献１等）。 Conventionally, as this type of intercom system, as shown in FIG. 4, a trunk line L10 extending from the main apparatus S10 and a plurality of terminals 20a, 20b,. .., L20n and the trunk line L10 and the plurality of branch lines L20a, L20b for signal transmission between the main apparatus 10 and the terminals 20a, 20b,. ,..., An interphone system having a plurality of branching devices 30a, 30b,..., 30n inserted between L20n is known (for example, Patent Document 1).
なお、以下の説明では、複数の端末器２０ａ、２０ｂ、・・・、２０ｎ、複数の分岐線Ｌ２０ａ、Ｌ２０ｂ、・・・、Ｌ２０ｎ、複数の端末器２０ａ、２０ｂ、・・・、２０ｎのそれぞれを単一のものとして区別するときは、説明を簡単にするため、単に、「端末器２０」「分岐線Ｌ２０」および「分岐器３０」として説明する。 In the following description, a plurality of terminals 20a, 20b, ..., 20n, a plurality of branch lines L20a, L20b, ..., L20n, and a plurality of terminals 20a, 20b, ..., 20n, respectively. Are simply described as “terminal device 20”, “branch line L20”, and “branch device 30” for the sake of simplicity.
このような構成のインターホンシステムにおいては、一般的に、幹線Ｌ１０と分岐線Ｌ２０との各分岐点にそれぞれ分岐器３０を挿入することで、インピーダンスの不整合（ミスマッチ）による伝送信号の反射等の影響を抑制することが行われている。 In an intercom system having such a configuration, in general, by inserting a branching device 30 at each branch point between the trunk line L10 and the branch line L20, reflection of a transmission signal due to impedance mismatch (mismatch), etc. Suppressing the impact is done.
ここで、分岐器３０を用いて反射等の影響を抑制するためには、以下の２つの条件を満たすように設計する必要がある。 Here, in order to suppress the influence of reflection or the like using the branching device 30, it is necessary to design so as to satisfy the following two conditions.
第１に、分岐器３０に接続された端末器２０での伝送信号の受信時において、幹線Ｌ１０側から分岐線Ｌ２０側を見たときのインピーダンスが伝送線路の特性インピーダンスよりも高くなっていることが必要である。 First, when receiving a transmission signal at the terminal 20 connected to the branching device 30, the impedance when the branching line L20 side is viewed from the main line L10 side is higher than the characteristic impedance of the transmission line. is necessary.
第２に、分岐器３０に接続された端末器２０からの伝送信号の送信時において、分岐線Ｌ２０側から幹線Ｌ１０側を見たときのインピーダンスが伝送線路の特性インピーダンスと一致していることが必要である。 Second, when transmitting a transmission signal from the terminal device 20 connected to the branching device 30, the impedance when the trunk line L10 side is viewed from the branching line L20 side matches the characteristic impedance of the transmission line. is necessary.
図５は、上記の条件を満たす分岐器３０の構成例を示している。 FIG. 5 shows a configuration example of the branching device 30 that satisfies the above conditions.
同図において、分岐器３０は、上流側（図５の左側）の幹線Ｌ１０が接続される幹線端子Ｔ１０ａ、Ｔ１０ｂと、下流側（図５の右側）の幹線Ｌ１０が接続される幹線端子Ｔ１０ａ´、Ｔ１０ｂ´と、分岐線Ｌ２０が接続される分岐線端子Ｔ２０ａ、Ｔ２０ｂとを備えており、これらの幹線端子Ｔ１０ａ、Ｔ１０ｂ、Ｔ１０ａ´、Ｔ１０ｂ´と分岐線端子Ｔ２０ａ、Ｔ２０ｂとの間には幹線端子Ｔ１０ａ、Ｔ１０ｂ、Ｔ１０ａ´、Ｔ１０ｂ´側を１次巻線、分岐線端子Ｔ２０ａ、Ｔ２０ｂ側を２次巻線とするトランスＴｒ１０が接続されている。また、各幹線端子Ｔ１０ａ、Ｔ１０ｂ、Ｔ１０ａ´、Ｔ１０ｂ´とトランスＴｒ１０の１次巻線との間にはそれぞれ抵抗Ｒ１、Ｒ２が接続されている。 In the figure, a branching device 30 includes trunk line terminals T10a and T10b to which an upstream side (left side in FIG. 5) trunk line L10 is connected and a trunk line terminal T10a ′ to which a downstream side (right side in FIG. 5) trunk line L10 is connected. , T10b ′ and branch line terminals T20a, T20b to which the branch line L20 is connected, and the trunk line between these trunk line terminals T10a, T10b, T10a ′, T10b ′ and the branch line terminals T20a, T20b. A transformer Tr10 is connected to which the terminals T10a, T10b, T10a ′, and T10b ′ are primary windings and the branch line terminals T20a and T20b are secondary windings. Resistors R1 and R2 are connected between the trunk terminals T10a, T10b, T10a ′, T10b ′ and the primary winding of the transformer Tr10, respectively.
なお、この分岐器３０は幹線Ｌ１０における分岐線Ｌ２０の分岐点となる各部位に挿入される形で接続されるので、幹線端子Ｔ１０ａ、Ｔ１０ｂ、Ｔ１０ａ´、Ｔ１０ｂ´は、幹線Ｌ１０の上流側と幹線Ｌ１０の下流側とのそれぞれに対応して２組設けられており、上流側の幹線端子Ｔ１０ａ、Ｔ１０ｂと下流側の幹線端子Ｔ１０ａ´、Ｔ１０ｂ´とが互いに接続されている。また、端末器２０を分岐線Ｌ２０の先端に接続する場合には、通常、端末器２０は伝送線路とのインピーダンス整合（インピーダンスマッチング）を実現するために、伝送線路の特性インピーダンスに近いインピーダンスに設定されている。 Since this branching device 30 is connected in such a way that it is inserted into each part of the trunk line L10 that becomes the branch point of the branch line L20, the trunk terminals T10a, T10b, T10a ′, T10b ′ are connected to the upstream side of the trunk line L10. Two sets are provided corresponding to the downstream side of the trunk line L10, and the upstream trunk line terminals T10a and T10b and the downstream trunk line terminals T10a ′ and T10b ′ are connected to each other. When the terminal device 20 is connected to the tip of the branch line L20, the terminal device 20 is usually set to an impedance close to the characteristic impedance of the transmission line in order to realize impedance matching (impedance matching) with the transmission line. Has been.
ここで、上記の第１の条件を満たすためには、トランスＴｒ１０の１次巻線の巻数Ｎ１と２次巻線の巻数Ｎ２との比である巻数比ｎ（＝Ｎ１／Ｎ２）を、ｎ＞１（つまり、Ｎ１＞Ｎ２）とする必要がある。このとき、幹線Ｌ１０側から見た分岐線Ｌ２０側のインピーダンスＺ１は、Ｚ１＝ｎ２×Ｚａ＋ｒ１＋ｒ２となる。なお、Ｚａは伝送線路の特性インピーダンス、ｒ１、ｒ２はそれぞれ抵抗Ｒ１、Ｒ２の抵抗値を表している。 Here, in order to satisfy the first condition, the turns ratio n (= N1 / N2), which is the ratio of the number of turns N1 of the primary winding and the number of turns N2 of the secondary winding of the transformer Tr10, is set to n > 1 (ie, N1> N2). At this time, the impedance Z1 on the branch line L20 side viewed from the main line L10 side is Z1 = n2 × Za + r1 + r2. Za represents the characteristic impedance of the transmission line, and r1 and r2 represent the resistance values of the resistors R1 and R2, respectively.
また、分岐線Ｌ２０側から見た幹線Ｌ１０側のインピーダンスＺ２は、Ｚ２＝（１／ｎ）２×（ｒ１＋ｒ２＋Ｚａ／２）で表されるので、上記の第２の条件を満たすためには、抵抗Ｒ１、Ｒ２の抵抗値ｒ１、ｒ２は、次の式を満たす必要がある。 Further, since the impedance Z2 on the trunk line L10 side viewed from the branch line L20 side is expressed by Z2 = (1 / n) 2 × (r1 + r2 + Za / 2), in order to satisfy the second condition, a resistance The resistance values r1 and r2 of R1 and R2 need to satisfy the following formula.
Ｚａ≒（１／ｎ）２×（ｒ１＋ｒ２＋Ｚａ／２） Za≈ (1 / n) 2 × (r1 + r2 + Za / 2)
ところで、このような構成の分岐器３０においては、図６（ａ）に示すように上流側の幹線Ｌ１０−下流側の幹線Ｌ１０間をエネルギが通過するときの通過損失ＢＬ１と、幹線Ｌ１０−分岐線Ｌ２０間をエネルギが通過するときの分岐損失ＢＬ２との関係は、一般的には図６（ｂ）に示すように、ＢＬ１≪ＢＬ２となるため、分岐器３０を介して幹線Ｌ１０−分岐線Ｌ２０間をエネルギが通過する際に比較的大きな伝送損失（ロス）が生じる。 By the way, in the branching device 30 having such a configuration, as shown in FIG. 6A, the passage loss BL1 when energy passes between the upstream trunk line L10 and the downstream trunk line L10, and the trunk line L10-branch. Since the relationship between the branch loss BL2 when energy passes between the lines L20 is generally BL1 << BL2, as shown in FIG. 6B, the trunk line L10-branch line via the branch device 30 When energy passes between L20, a relatively large transmission loss occurs.
ここで、このような構成のインターホンシステムにおける伝送システムにおいて、例えば第１の端末器２０ａから最後段の端末器２０ｎへ伝送信号を送信する場合を例として考えると、伝送信号の伝送損失は、反射等の影響がないものとして、第１の分岐線Ｌ２０ａを通過する際のロス（ケーブル損失）と、第１の分岐器３０ａを分岐線端子Ｔ２０ａ、Ｔ２０ｂ側から下流側の幹線端子Ｔ１０ａ´、Ｔ１０ｂ´側へ通過する際の分岐損失と、第１の分岐器３０ａ−最後段の分岐器３０ｎ間に存在する分岐器３０ｂ、・・・、３０ｎを通過する際の通過損失と、第１の分岐器３０ａ−最後段の分岐器３０ｎ間に存在する幹線Ｌ１０でのケーブル損失と、最後段の分岐器３０ｎを上流側の幹線端子Ｔ１０ａ、Ｔ１０ｂ側から分岐線端子Ｔ２０ａ、Ｔ２０ｂ側へ通過する際の分岐損失と、最後段の分岐線Ｌ２０ｎを通過する際のケーブル損失とを足し合わせたものになる。 Here, in the transmission system in the intercom system having such a configuration, for example, when a transmission signal is transmitted from the first terminal 20a to the terminal 20n at the last stage, the transmission loss of the transmission signal is reflected. As a result, the loss (cable loss) when passing through the first branch line L20a and the first branching device 30a from the branch line terminals T20a and T20b to the downstream trunk terminals T10a ′ and T10b Branch loss when passing to the ′ side, passage loss when passing through the branching devices 30b,..., 30n existing between the first branching device 30a and the last branching device 30n, and the first branching Cable loss in the trunk line L10 existing between the branching device 30a and the last branching device 30n, and branching terminal T20a, T from the upstream trunking terminal T10a, T10b side to the last branching device 30n. This is the sum of the branch loss when passing to the 20b side and the cable loss when passing through the last branch line L20n.
従って、複数の分岐器３０ａ、３０ｂ、・・・、３０ｎを用いた接続形態では、インピーダンスの不整合による影響を抑制できるという利点がある反面、別々の分岐線Ｌ２０ａ、Ｌ２０ｂ、・・・、Ｌ２０ｎに接続された端末器２０ａ、２０ｂ、・・・、２０ｎ間の信号伝送においては、常に、伝送信号を送信する側の端末器２が接続された分岐器３０と、伝送信号を受信する側の端末器２０が接続された分岐器３０との２箇所で分岐損失ＢＬ２が生じ、ひいては伝送損失が大きくなるという難点があった。 Therefore, in the connection form using the plurality of branching devices 30a, 30b,..., 30n, there is an advantage that the influence of impedance mismatching can be suppressed, but on the other hand, separate branch lines L20a, L20b,. In the signal transmission between the terminals 20a, 20b,..., 20n connected to each other, the branching device 30 to which the terminal 2 on the transmission signal transmission side is always connected and the transmission signal receiving side on the side There is a problem in that branch loss BL2 occurs at two locations with the branch device 30 to which the terminal device 20 is connected, and as a result, transmission loss increases.
本発明は、このような難点を解決するためになされたもので、端末器間の信号伝送における伝送損失を低減することができるインターホンシステムを提供することを目的としている。 The present invention has been made to solve such a problem, and an object of the present invention is to provide an intercom system capable of reducing transmission loss in signal transmission between terminals.
この目的を達成するために、本発明のインターホンシステムは、主装置から延線される幹線と、幹線から分岐されて複数の端末器にそれぞれ接続される複数の分岐線と、主装置及び端末器間で信号伝送を行うにあたり幹線及び複数の分岐線間にそれぞれ挿入され、幹線が接続される幹線端子及び分岐線が接続される分岐線端子を有する複数の分岐器とを備えるインターホンシステムにおいて、
複数の分岐器は、自己の端末器から分岐線を経由して送信されてくる分岐線側伝送信号を監視し、自己の端末器から送信される分岐線側伝送信号が主装置に対するものであるか否かを検知する送信信号検知手段と、
自己の端末器から主装置に対し送信される分岐線側伝送信号を検知している間、送信信号検知手段から出力される制御信号によって幹線の特性インピーダンスで分岐線側伝送信号を幹線端子に送出するために制御される送信信号出力インピーダンス可変手段と、
幹線端子から受信され分岐線端子に送出される幹線側伝送信号が一次巻線から入力されるトランス（ただし、一次巻線の巻数、二次巻線の巻数との比である巻線比ｎをｎ＞１にする）と、
二次巻線からの幹線側伝送信号を検知する受信信号検知手段と、
幹線側伝送信号を増幅する伝送信号増幅手段と、
伝送信号増幅手段による増幅利得を制御する利得制御手段とを備えるものである。
In order to achieve this object, an interphone system of the present invention includes a main line extending from a main apparatus, a plurality of branch lines branched from the main line and connected to a plurality of terminals, and the main apparatus and the terminal. In interphone system comprising a plurality of branching units having a branch line terminal connected to a trunk line terminal and a branch line connected to a trunk line and a branch line terminal inserted into the trunk line and a plurality of branch lines, respectively, in performing signal transmission between
A plurality of branching devices monitor branch line side transmission signals transmitted from their own terminals via branch lines, and branch line side transmission signals transmitted from its own terminals are for the main unit. Transmission signal detection means for detecting whether or not,
While detecting the branch line side transmission signal transmitted from its own terminal to the main unit, the branch line side transmission signal is sent to the trunk line terminal with the characteristic impedance of the trunk line by the control signal output from the transmission signal detection means. A transmission signal output impedance variable means controlled to
Transformer that receives main line transmission signal received from main line terminal and sent to branch line terminal is input from primary winding (however, turn ratio n, which is the ratio between the number of turns of primary winding and the number of turns of secondary winding. n> 1)
A reception signal detection means for detecting a main transmission signal from the secondary winding;
Transmission signal amplification means for amplifying the trunk side transmission signal;
Gain control means for controlling the amplification gain by the transmission signal amplification means.
本発明のインターホンシステムは、送信信号検知手段は、分岐線側伝送信号が検知処理するために必要な時間分、送信信号出力インピーダンス可変手段への分岐線側伝送信号の入力を遅延させる制御信号を出力する機能を備えるものである。 In the intercom system of the present invention, the transmission signal detection means delays the input of the branch line side transmission signal to the transmission signal output impedance variable means by the time necessary for the branch line side transmission signal to perform detection processing. It has a function to output.
本発明のインターホンシステムは、伝送信号増幅手段は、受信信号検知手段で検知される幹線側伝送信号の減衰量を検知し、減衰量が所定の閾値レベル以上であったとき、分岐線端子への幹線側伝送信号の送出を停止する機能を備えるものである。 In the intercom system of the present invention, the transmission signal amplifying means detects the attenuation amount of the trunk-side transmission signal detected by the reception signal detection means, and when the attenuation amount is equal to or greater than a predetermined threshold level, A function of stopping transmission of the transmission signal on the main line side is provided.
本発明のインターホンシステムは、利得制御手段は、受信信号検知手段で検知される幹線側伝送信号の減衰量が所定の閾値レベル未満であったとき、伝送信号増幅手段の利得を可変する機能を備えるものである。 In the intercom system of the present invention, the gain control means has a function of varying the gain of the transmission signal amplifying means when the attenuation amount of the main transmission signal detected by the reception signal detection means is less than a predetermined threshold level. Is.
本発明のインターホンシステムは、伝送信号増幅手段は、利得制御手段の利得レベルに対応させて幹線側伝送信号の波形補正を実行するイコライザ機能を備えるものである。 In the interphone system according to the present invention, the transmission signal amplification means includes an equalizer function for executing waveform correction of the trunk side transmission signal in correspondence with the gain level of the gain control means.
本発明のインターホンシステムによれば、分岐器に搭載された送信信号検知手段（送信信号検知回路）や送信信号出力インピーダンス可変手段（送信信号出力インピーダンス可変回路）によって、端末器から分岐線を経由して送信されてくる分岐線側伝送信号を検知することで、端末器から主装置に対し送信される分岐線側伝送信号を検知している間、幹線の特性インピーダンスで分岐線側伝送信号を送出することができる。従って、本発明のインターホンシステムによれば、端末器からの伝送信号の送信時には受信経路よりも伝送損失の少ない送信経路に通過させることができるので、端末器間での伝送損失を低減することができる。 According to the intercom system of the present invention, the transmission signal detection means (transmission signal detection circuit) and the transmission signal output impedance variable means (transmission signal output impedance variable circuit) mounted on the branching unit are connected via the branch line from the terminal unit. By detecting the branch line side transmission signal transmitted from the terminal, the branch line side transmission signal is transmitted with the characteristic impedance of the trunk line while the branch line side transmission signal transmitted from the terminal to the main unit is detected. can do. Therefore, according to the intercom system of the present invention, when transmitting a transmission signal from a terminal, it can be transmitted through a transmission path with a transmission loss smaller than that of the reception path, so that transmission loss between terminals can be reduced. it can.
以下、本発明のインターホンシステムを適用した最良の実施の形態例について、図面を参照して説明する。
［実施例１］
図１は、本発明の一実施例におけるマンション等の集合住宅に設置されるインターホンシステムの全体構成を示すブロック図である。
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments to which an intercom system of the invention is applied will be described with reference to the drawings.
[Example 1]
FIG. 1 is a block diagram showing the overall configuration of an intercom system installed in an apartment house such as a condominium in one embodiment of the present invention.
本発明のインターホンシステムは、集合玄関機としての主装置１から延線される平衡線路（ペア線）からなる幹線Ｌ１と、幹線から分岐されて複数の居室親機としての端末器２ａ、２ｂ、・・・、２ｎにそれぞれ接続される複数の平衡線路（ペア線）からなる分岐線Ｌ２ａ、Ｌ２ｂ・・・、Ｌ２ｎと、主装置１及び端末器２ａ、２ｂ、・・・、２ｎ間で信号伝送を行うにあたり幹線Ｌ１及び複数の分岐線Ｌ２ａ、Ｌ２ｂ、・・・、Ｌ２ｎ間にそれぞれ挿入される複数の分岐器３ａ、３ｂ、・・・、３ｎとを備えている。なお、以下の実施例では、複数の端末機２ａ、２ｂ、・・・、２ｎ、複数の分岐器３ａ、３ｂ、・・・、３ｎ、複数の分岐線Ｌ２ａ、Ｌ２ｂ、・・・、Ｌ２ｎのそれぞれを単一のものとして区別するときは、説明を簡単にするため、単に、「端末機２」、「分岐器３」、「分岐線Ｌ２」として説明する。 The intercom system of the present invention includes a trunk line L1 composed of a balanced line (paired line) extended from the main apparatus 1 as a collective entrance machine, and terminals 2a, 2b as branch base units branched from the trunk line. ... Branch lines L2a, L2b ..., L2n consisting of a plurality of balanced lines (pair lines) connected to 2n, and signals between main device 1 and terminals 2a, 2b, ..., 2n .., 3n are provided between the trunk line L1 and the plurality of branch lines L2a, L2b,..., L2n. In the following embodiment, a plurality of terminals 2a, 2b,..., 2n, a plurality of branching devices 3a, 3b, ..., 3n, a plurality of branch lines L2a, L2b,. When distinguishing each of them as a single unit, for the sake of simplicity of explanation, they are simply described as “terminal 2”, “branch unit 3”, and “branch line L2.
図２は、本発明の一実施例における複数の分岐器のブロック図を示している。 FIG. 2 shows a block diagram of a plurality of branching units in one embodiment of the present invention.
同図において、複数の分岐器３は、それぞれ同様の構成とされ、それぞれ幹線Ｌ１が接続される幹線端子Ｔ１ａ、Ｔ１ｂ、Ｔ１ａ´、Ｔ１ｂ´（以下、上流側の幹線端子Ｔ１ａ、Ｔ１ｂと下流側の幹線端子Ｔ１ａ´、Ｔ１ｂ´は電気的に等価であるから、以下の実施例では、特に区別しないときには単に幹線端子「Ｔ１Ａ、Ｔ１Ｂ」として説明する。）と、分岐線Ｌ２ａ、Ｌ２ｂ・・・、Ｌ２ｎが接続される分岐線端子Ｔ２ａ、Ｔ２ｂと、端末器２から分岐線Ｌ２を経由して送信されてくる分岐線側伝送信号Ｓ１を検知する送信信号検知手段としての送信信号検知回路３１と、分岐線側伝送信号Ｓ１を幹線Ｌ１に出力するための送信信号出力手段としての送信信号出力回路３２と、幹線端子Ｔ１Ａ、Ｔ１Ｂから受信経路を経由して受信され分岐線端子Ｔ２ａ、Ｔ２ｂに送出される幹線側伝送信号Ｓ２を検知する受信信号検知手段としての受信信号検知回路３３と、幹線側伝送信号Ｓ２を増幅する伝送信号増幅手段としての受信信号増幅回路３４と、受信信号増幅回路３４の増幅利得を制御する利得制御手段としての利得制御回路３５と、幹線端子Ｔ１Ａ、Ｔ１Ｂ側を一次巻線、分岐線端子Ｔ２ａ、Ｔ２ｂ側を二次巻線とするトランスＴｒ１とを備えている。また、送信信号出力回路３２は、後述する幹線端子Ｔ１Ａ、Ｔ１Ｂ及び分岐線端子Ｔ２ａ、Ｔ２ｂ間に形成される信号経路であって幹線Ｌ１を経由して送信されてくる幹線側伝送信号Ｓ２の受信経路及び分岐線側伝送信号Ｓ１の送信経路のうち送信経路を経由して幹線端子Ｔ１Ａ、Ｔ１Ｂに分岐線側伝送信号Ｓ１を送出し、幹線Ｌ１に介在する送信信号出力インピーダンス可変手段としての送信信号出力インピーダンス可変回路３２ａを備えている。 In the figure, the plurality of branching devices 3 have the same configuration, and are connected to the trunk terminals T1a, T1b, T1a ′, T1b ′ (hereinafter referred to as upstream trunk terminals T1a, T1b and downstream) to which the trunk line L1 is connected. The trunk terminals T1a 'and T1b' are electrically equivalent to each other. Therefore, in the following embodiments, they are simply described as trunk terminals "T1A, T1B" unless otherwise distinguished), branch lines L2a, L2b. , Branch line terminals T2a and T2b to which L2n is connected, and a transmission signal detection circuit 31 as a transmission signal detection means for detecting a branch line side transmission signal S1 transmitted from the terminal 2 via the branch line L2, and The transmission signal output circuit 32 as a transmission signal output means for outputting the branch line side transmission signal S1 to the trunk line L1 and the branch received from the trunk terminals T1A and T1B via the reception path A reception signal detection circuit 33 as a reception signal detection means for detecting the main transmission signal S2 sent to the terminals T2a and T2b, a reception signal amplification circuit 34 as a transmission signal amplification means for amplifying the main transmission signal S2, A gain control circuit 35 as a gain control means for controlling the amplification gain of the reception signal amplifier circuit 34; a transformer Tr1 having a primary winding on the trunk line terminals T1A and T1B side and a secondary winding on the branch line terminals T2a and T2b side; It has. The transmission signal output circuit 32 is a signal path formed between trunk line terminals T1A and T1B and branch line terminals T2a and T2b, which will be described later, and receives a trunk line side transmission signal S2 transmitted via the trunk line L1. The transmission signal as transmission signal output impedance varying means that sends the branch line side transmission signal S1 to the trunk terminals T1A and T1B via the transmission path among the transmission paths of the path and the branch line side transmission signal S1 and is interposed in the trunk line L1. An output impedance variable circuit 32a is provided.
ここで、送信信号検知回路３１は、後述するように、複数の端末器２ａ、２ｂ、・・・、２ｎのうち何れか１つから主装置１に対し送信される分岐線側伝送信号Ｓ１を検知している間、幹線Ｌ１の特性インピーダンスで分岐線側伝送信号Ｓ１を送出するために送信信号出力インピーダンス可変回路３１ａを制御する制御信号を出力する機能や分岐線側伝送信号Ｓ１が検知処理するために必要な時間分、送信信号出力インピーダンス可変手段としての送信信号出力インピーダンス可変回路３１ａへの分岐線側伝送信号Ｓ１の入力を遅延させる制御信号を出力する機能を備えている。また、受信信号増幅回路３４は、後述するように、受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量を検知し、減衰量が所定の閾値レベル以上であったとき、分岐線端子Ｔ２ａ、Ｔ２ｂへの幹線側伝送信号Ｓ２の送出を停止する機能や利得制御回路３５の利得レベルに対応させて幹線側伝送信号Ｓ２の波形補正を実行するイコライザ機能を備えている。さらに、利得制御回路３５は、後述するように受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量が所定の閾値レベル未満であったとき、受信信号増幅回路３４の増幅利得を可変する機能を備えている。 Here, as will be described later, the transmission signal detection circuit 31 receives the branch line side transmission signal S1 transmitted to the main device 1 from any one of the plurality of terminals 2a, 2b,. While detecting, the function of outputting a control signal for controlling the transmission signal output impedance variable circuit 31a in order to send the branch line side transmission signal S1 with the characteristic impedance of the trunk line L1 and the branch line side transmission signal S1 perform detection processing. Therefore, it has a function of outputting a control signal for delaying the input of the branch line side transmission signal S1 to the transmission signal output impedance variable circuit 31a as the transmission signal output impedance variable means for the time required for this. Further, as will be described later, the reception signal amplifier circuit 34 detects the attenuation amount of the main transmission signal S2 detected by the reception signal detection circuit 33, and when the attenuation amount is equal to or higher than a predetermined threshold level, the branch line A function for stopping transmission of the main line side transmission signal S2 to the terminals T2a and T2b and an equalizer function for executing waveform correction of the main line side transmission signal S2 in correspondence with the gain level of the gain control circuit 35 are provided. Further, as will be described later, the gain control circuit 35 changes the amplification gain of the reception signal amplification circuit 34 when the attenuation amount of the main transmission signal S2 detected by the reception signal detection circuit 33 is less than a predetermined threshold level. It has a function to do.
なお、幹線側伝送信号として例えば、フレーム毎に伝送される信号の一形態として、その信号を構成する複数のスロットのうち、所定のスロットに、集合玄関機から特定の居室親機への呼出しがあることを示す呼出データ、集合玄関機の撮像機能で生成される映像データ、集合玄関機の通話機能で生成される通話データがそれぞれ組込まれている。また、分岐線側伝送信号として例えば、フレーム毎に伝送される信号の一形態として、その信号を構成する複数のスロットのうち、所定のスロットに、集合玄関機から特定の居室親機への呼出しに当該居室親機が応答したことを示す応答データ、特定の居室親機の通話機能で生成される音声データがそれぞれ組込まれている。 In addition, as a main line side transmission signal, for example, as a form of a signal transmitted for each frame, a call from the collective entrance unit to a specific room base unit is placed in a predetermined slot among a plurality of slots constituting the signal. Call data indicating the presence, video data generated by the imaging function of the collective entrance machine, and call data generated by the call function of the collective entrance machine are incorporated. In addition, as a branch line side transmission signal, for example, as a form of a signal transmitted for each frame, a call from a central entrance to a specific room base unit in a predetermined slot among a plurality of slots constituting the signal Response data indicating that the room master has responded and voice data generated by the call function of the specific room master are incorporated.
次に、このように構成された本発明の一実施例におけるインターホンシステムの具体的な動作について説明する。なお、本発明の実施例において、住戸玄関に居る来訪者が玄関子機（不図示）を使用して所定の呼出操作を行い、この玄関呼出しを検出した居室親機としての端末器２の信号処理部（不図示）の制御による所定の呼出報知動作、及び居住者が端末器２の操作部（不図示）を使用して所定の応答操作を行い来訪者との間で通話を成立させる動作はそれぞれ、インターホン通信分野において周知な技術であるため、説明は省略する。 Next, a specific operation of the intercom system according to an embodiment of the present invention configured as described above will be described. In the embodiment of the present invention, a visitor at the entrance of the dwelling unit performs a predetermined calling operation using an entrance cordless handset (not shown), and the signal of the terminal 2 as the room base unit that has detected this entrance calling. A predetermined call notification operation by control of the processing unit (not shown), and an operation in which the resident uses the operation unit (not shown) of the terminal device 2 to perform a predetermined response operation to establish a call with the visitor. Since each is a well-known technique in the intercom communication field, description thereof will be omitted.
先ず、本発明の第１の実施例におけるインターホンシステムにおいては、前述の分岐器３の各回路のうち、少なくとも送信信号検知回路３１および送信信号出力インピーダンス可変回路３２ａを備えている。 First, the intercom system according to the first embodiment of the present invention includes at least a transmission signal detection circuit 31 and a transmission signal output impedance variable circuit 32a among the circuits of the branching device 3 described above.
このように構成された伝送システムにおいては、幹線Ｌ１と当該幹線Ｌ１から分岐された複数の分岐線Ｌ２とを含む伝送線路と、各分岐線路Ｌ２の先端に接続された複数台の端末器２とを備え、これら複数台の端末器２間で伝送線路を介して信号伝送が行われる。 In the transmission system configured as described above, a transmission line including the trunk line L1 and a plurality of branch lines L2 branched from the trunk line L1, and a plurality of terminals 2 connected to the tip of each branch line L2; The signal transmission is performed between the plurality of terminals 2 via the transmission line.
ここで、端末器２を分岐線Ｌ２の先端に接続する場合には、通常、端末器２は伝送線路とのインピーダンス整合（インピーダンス・マッチング）を実現するために、伝送線路の特性インピーダンスに近いインピーダンスに設定されている。 Here, when the terminal 2 is connected to the tip of the branch line L2, the terminal 2 normally has an impedance close to the characteristic impedance of the transmission line in order to realize impedance matching with the transmission line (impedance matching). Is set to
分岐器３は、伝送線路を構成する幹線Ｌ１と分岐線Ｌ２との各分岐点にそれぞれ挿入され、インピーダンス不整合による伝送信号の反射等の影響を抑制する。 The branching device 3 is inserted into each branch point of the trunk line L1 and the branch line L2 constituting the transmission line, and suppresses the influence of transmission signal reflection or the like due to impedance mismatch.
ここで、幹線Ｌ１および分岐線Ｌ２はペア線からなるので、上流側の幹線端子Ｔ１ａ、Ｔ１ｂ、下流側の幹線端子Ｔ１ａ´、Ｔ１ｂ´および分岐線端子Ｔ２ａ、Ｔ２ｂはそれぞれ２個１組として設けられている。さらに、この分岐器３は幹線Ｌ１の分岐線Ｌ２の分岐点となる各部位に挿入される形で接続されるので、幹線端子Ｔ１ａ、Ｔ１ｂ、Ｔ１ａ´、Ｔ１ｂ´は幹線Ｌ１の上流側（図１の左側）と幹線Ｌ１の下流側（図２の右側）とのそれぞれに対応して２組設けられており、上流側の端子Ｔ１ａ、Ｔ１ｂと下流側の端子Ｔ１ａ´、Ｔ１ｂ´とが互いに接続されている。 Here, since the trunk line L1 and the branch line L2 are made of a paired line, the upstream trunk line terminals T1a and T1b, the downstream trunk line terminals T1a ′ and T1b ′, and the branch line terminals T2a and T2b are provided as one set. It has been. Further, since the branching device 3 is connected in such a manner that it is inserted into each part that becomes a branching point of the branch line L2 of the main line L1, the main line terminals T1a, T1b, T1a ′, T1b ′ are upstream of the main line L1 (see FIG. 1) and the downstream side of the trunk line L1 (the right side in FIG. 2), two sets are provided, and the upstream side terminals T1a and T1b and the downstream side terminals T1a ′ and T1b ′ are mutually connected. It is connected.
ここで、幹線端子Ｔ１Ａ、Ｔ１Ｂと分岐線端子Ｔ２ａ、Ｔ２ｂとの間には、次に述べるように、端末器２で送受信される伝送信号を通す経路として送信経路Ｔｘ１と、受信経路Ｒｘ１との２つの経路が形成される。 Here, between the trunk line terminals T1A and T1B and the branch line terminals T2a and T2b, as described below, a transmission path Tx1 and a reception path Rx1 as a path through which transmission signals transmitted and received by the terminal 2 are passed. Two paths are formed.
送信経路Ｔｘ１は、分岐線側伝送信号Ｓ１を幹線Ｌ１に出力するための送信信号出力手段としての送信信号出力回路３２と、分岐線側伝送信号Ｓ１を検知するための送信信号検知回路３１とを備えている。 The transmission path Tx1 includes a transmission signal output circuit 32 as transmission signal output means for outputting the branch line side transmission signal S1 to the trunk line L1, and a transmission signal detection circuit 31 for detecting the branch line side transmission signal S1. I have.
具体的には、送信経路Ｔｘ１の送信信号出力回路３２の出力インピーダンスは、分岐線側伝送信号Ｓ１を送信するときは幹線Ｌ１の特性インピーダンスとなり、それ以外のときは高インピーダンスに制御されるようになっている。 Specifically, the output impedance of the transmission signal output circuit 32 of the transmission path Tx1 is the characteristic impedance of the trunk line L1 when transmitting the branch line side transmission signal S1, and is controlled to be high impedance at other times. It has become.
送信信号出力回路３２の制御は、送信信号検知回路３１により端末器２の分岐線側伝送信号Ｓ１の有無を検知することで行われている。 The transmission signal output circuit 32 is controlled by detecting the presence or absence of the branch line side transmission signal S1 of the terminal 2 by the transmission signal detection circuit 31.
受信経路Ｒｘ１は、幹線端子Ｔ１Ａ、Ｔ１Ｂ側を一次巻線、分岐線端子Ｔ２ａ、Ｔ２ｂ側を二次巻線とするトランスＴｒ１を備えており、ここでは、トランスＴｒ１の一次巻線の巻数Ｎ１、二次巻線の巻数Ｎ２との比である巻線比ｎ（＝Ｎ１／Ｎ２）をｎ＞１（つまり、Ｎ１＞Ｎ２）としてある。 The reception path Rx1 includes a transformer Tr1 having a primary winding on the main line terminals T1A and T1B side and a secondary winding on the branch line terminals T2a and T2b side. Here, the number of turns N1 of the primary winding of the transformer Tr1, A winding ratio n (= N1 / N2) which is a ratio with the number of turns N2 of the secondary winding is set to n> 1 (that is, N1> N2).
また、受信経路Ｒｘ１は幹線側伝送信号Ｓ２を検知するための受信信号検知回路３３と、幹線側伝送信号Ｓ２を増幅する受信信号増幅回路３４と、受信信号増幅回路３４の増幅利得を制御する利得制御回路３５とを備えている。 The reception path Rx1 includes a reception signal detection circuit 33 for detecting the main transmission signal S2, a reception signal amplification circuit 34 for amplifying the main transmission signal S2, and a gain for controlling the amplification gain of the reception signal amplification circuit 34. And a control circuit 35.
具体的には、受信経路Ｒｘ１の受信信号増幅回路３４は、幹線受信信号Ｓ２を受信信号検知回路３３にて信号の有無および信号振幅を検知することで、利得制御回路３５により適正信号振幅となるように利得制御がなされる。 Specifically, the reception signal amplifying circuit 34 of the reception path Rx1 detects the presence / absence of the signal and the signal amplitude of the main line reception signal S2 by the reception signal detection circuit 33, thereby obtaining an appropriate signal amplitude by the gain control circuit 35. Thus, gain control is performed.
以上の説明から明らかなように、本発明の第１の実施例におけるインターホンシステムによれば、分岐器３に搭載された送信信号検知手段（送信信号検知回路３１）や送信信号出力インピーダンス可変手段（送信信号出力インピーダンス可変回路３２ａ）によって、端末器２から分岐線Ｌ２を経由して送信されてくる分岐線側伝送信号Ｓ１を検知することで、端末器２から主装置１に対し送信される分岐線側伝送信号Ｓ１を検知している間、幹線Ｌ１の特性インピーダンスで分岐線側伝送信号Ｓ１を送出することができる。従って、本発明のインターホンシステムによれば、端末器２からの伝送信号の送信時には受信経路よりも伝送損失の少ない送信経路に通過させることができるので、端末器間での伝送損失を低減することができる。 As is clear from the above description, according to the intercom system in the first embodiment of the present invention, the transmission signal detection means (transmission signal detection circuit 31) mounted on the branching device 3 and the transmission signal output impedance variable means ( The transmission signal output impedance variable circuit 32a) detects the branch line side transmission signal S1 transmitted from the terminal device 2 via the branch line L2, thereby branching transmitted from the terminal device 2 to the main apparatus 1. While the line side transmission signal S1 is being detected, the branch line side transmission signal S1 can be sent out with the characteristic impedance of the trunk line L1. Therefore, according to the intercom system of the present invention, the transmission signal from the terminal 2 can be transmitted through a transmission path having a transmission loss smaller than that of the reception path when the transmission signal is transmitted, thereby reducing the transmission loss between the terminals. Can do.
次に、本発明のインターホンシステムの付加機能について説明する。
［実施例２］
この実施例においては、前述の第１の実施例におけるインターホンシステムに、更に、送信信号検知手段としての送信信号検知回路３１に、分岐線側伝送信号Ｓ１が検知処理するために必要な時間分（例えば、１００μｓｅｃ程度）、送信信号出力インピーダンス可変手段としての送信信号出力インピーダンス可変回路３２ａへの分岐線側伝送信号Ｓ１の入力を遅延させる制御信号を出力する機能が付加されている。
Next, additional functions of the intercom system of the present invention will be described.
[Example 2]
In this embodiment, the interphone system in the first embodiment described above, and further the transmission signal detection circuit 31 as the transmission signal detection means, the time required for the branch line side transmission signal S1 to be detected ( For example, a function of outputting a control signal for delaying the input of the branch line side transmission signal S1 to the transmission signal output impedance variable circuit 32a as a transmission signal output impedance variable means is added.
ここで、送信信号検知手段としての送信信号検知回路３１は、ピーク・ホールド回路、全波整流回路、半波整流回路、またはパルス・カウント回路で構成され、これらの回路で分岐線Ｌ２を経由して送信されてくる分岐線側伝送信号Ｓ１の検知を行うことができる。 Here, the transmission signal detection circuit 31 as the transmission signal detection means includes a peak hold circuit, a full-wave rectification circuit, a half-wave rectification circuit, or a pulse count circuit, and these circuits pass through the branch line L2. The branch line side transmission signal S1 transmitted can be detected.
本発明の第２の実施例におけるインターホンシステムによれば、分岐線側伝送信号Ｓ１が検知処理するために必要な時間分、送信信号出力インピーダンス可変回路３２ａへの分岐線側伝送信号Ｓ１の入力を遅延させることができることから、第１の実施例であるインターホンシステムの作用・効果に加えて、幹線Ｌ１への出力信号のいわゆる頭切れ現象の発生を防止することができる。
［実施例３］
この実施例においては、前述の第１の実施例または第２の実施例におけるインターホンシステムの分岐器３に、更に、幹線端子Ｔ１Ａ、Ｔ１Ｂから受信経路を経由して分岐線端子Ｔ２ａ、Ｔ２ｂに送出される幹線側伝送信号Ｓ２を検知する受信信号検知回路３３と、幹線側伝送信号Ｓ２を増幅する受信信号増幅回路３４と、受信信号増幅回路３４の増幅利得を制御する利得制御回路３５とが付加されている。
According to the intercom system of the second embodiment of the present invention, the branch line side transmission signal S1 is input to the transmission signal output impedance variable circuit 32a for the time necessary for the branch line side transmission signal S1 to perform detection processing. Since it can be delayed, in addition to the operation and effect of the intercom system according to the first embodiment, it is possible to prevent the so-called head break phenomenon of the output signal to the trunk line L1.
[Example 3]
In this embodiment, the interphone system branching device 3 in the first or second embodiment described above is further sent from the trunk terminals T1A and T1B to the branch line terminals T2a and T2b via the reception path. A reception signal detection circuit 33 for detecting the transmission signal S2 to be transmitted, a reception signal amplification circuit 34 for amplifying the transmission signal S2 on the main line, and a gain control circuit 35 for controlling the amplification gain of the reception signal amplification circuit 34 are added. Has been.
本発明の第３の実施例におけるインターホンシステムによれば、分岐器３に搭載された
受信信号検知回路３３、受信信号増幅回路３４および利得制御回路３５により、幹線側伝送信号Ｓ２の有無および大きさを検知し、幹線側伝送信号Ｓ２を増幅することができることから、第１の実施例または第２の実施例であるインターホンシステムの作用・効果に加えて、線路長に依存する線路損失や分岐器３の挿入に伴う損失に因る減衰を補償し適切な信号振幅を得ることができる。
［実施例４］
この実施例においては、前述の第３の実施例におけるインターホンシステムの伝送信号増幅手段としての受信信号増幅回路３４に、更に、受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量を検知し、減衰量が所定の閾値レベル（例えば、−２１０ｄＢ程度）以上であったとき、分岐線端子Ｔ２ａ、Ｔ２ｂへの幹線側伝送信号Ｓ２の送出を停止する機能が付加されている。
According to the intercom system of the third embodiment of the present invention, the presence / absence and magnitude of the main transmission signal S2 is detected by the reception signal detection circuit 33, the reception signal amplification circuit 34, and the gain control circuit 35 mounted on the branching unit 3. Can be detected and the main transmission signal S2 can be amplified. In addition to the operation and effect of the intercom system according to the first embodiment or the second embodiment, the line loss and the branching device depend on the line length. Therefore, it is possible to compensate for the attenuation due to the loss due to the insertion of 3 and obtain an appropriate signal amplitude.
[Example 4]
In this embodiment, the attenuation amount of the main transmission signal S2 detected by the reception signal detection circuit 33 is further added to the reception signal amplification circuit 34 as the transmission signal amplification means of the intercom system in the third embodiment. A function is added to stop transmission of the trunk-side transmission signal S2 to the branch line terminals T2a and T2b when detected and the attenuation amount is equal to or greater than a predetermined threshold level (for example, about -210 dB).
本発明の第４の実施例におけるインターホンシステムによれば、分岐器３に搭載された受信信号増幅回路３４に、受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量を検知し、減衰量が所定の閾値レベル以上であったとき、分岐線端子Ｔ２ａ、Ｔ２ｂへの幹線側伝送信号Ｓ２の送出を停止する機能が付加されていることから、第３の実施例であるインターホンシステムの作用・効果に加えて、次のような効果を奏する。すなわち、幹線側伝送信号Ｓ２として例えば、フレーム毎に伝送される信号の一形態として、その信号を構成する複数のスロットのうち、所定のスロットに、集合玄関機から特定の端末器（居室親機）２への呼出しがあることを示す呼出データ、集合玄関機の撮像機能で生成される映像データ、集合玄関機の通話機能で生成される音声データがそれぞれ組込まれているとき、この幹線側伝送信号Ｓ２の減衰量が例えば、幹線Ｌ１の線路長の長さに比例して所定の閾値レベル以上である場合、受信信号増幅回路３４を経由して増幅しても、増幅後の幹線側伝送信号Ｓ２を受信する特定の端末器（居室親機）２では、幹線側伝送信号Ｓ２に組込まれた各種データ（呼出データ、映像データ、音声データ）に基づく正常な動作を行うことができず、誤動作を発生するおそれがあるところ、第４の実施例においては、それを防止するにあたって信号の送出を停止することができる。
［実施例５］
この実施例においては、前述の第３の実施例または第４の実施例におけるインターホンシステムの利得制御手段としての利得制御回路３５に、受信信号検知手段としての受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量が所定の閾値レベル（例えば、３０ｄＢ程度）未満であったとき、伝送信号増幅手段としての受信信号増幅回路３４の利得を可変する機能が付加されている。
According to the intercom system of the fourth embodiment of the present invention, the reception signal amplification circuit 34 mounted on the branching device 3 detects the attenuation amount of the main transmission signal S2 detected by the reception signal detection circuit 33. Since the function of stopping the transmission of the trunk line side transmission signal S2 to the branch line terminals T2a and T2b when the attenuation amount is equal to or higher than a predetermined threshold level is added, the intercom system of the third embodiment In addition to the functions and effects, the following effects are achieved. That is, as the main transmission signal S2, for example, as a form of a signal transmitted for each frame, a predetermined terminal from a central entrance to a specific terminal (room base unit) among a plurality of slots constituting the signal ) When the call data indicating that there is a call to 2, the video data generated by the imaging function of the central entrance machine, and the voice data generated by the call function of the central entrance machine are respectively incorporated, this trunk side transmission For example, when the attenuation amount of the signal S2 is greater than or equal to a predetermined threshold level in proportion to the length of the main line L1, the main transmission signal after amplification is amplified even if it is amplified via the reception signal amplifier circuit 34. The specific terminal device (living room master) 2 that receives S2 cannot perform a normal operation based on various data (call data, video data, audio data) incorporated in the trunk-side transmission signal S2, Where there is a risk of generating operation, in the fourth embodiment, it is possible to stop the transmission of the signal when preventing it.
[Example 5]
In this embodiment, the main line detected by the reception signal detection circuit 33 as the reception signal detection means is added to the gain control circuit 35 as the gain control means of the intercom system in the third or fourth embodiment. When the attenuation amount of the side transmission signal S2 is less than a predetermined threshold level (for example, about 30 dB), a function of changing the gain of the reception signal amplification circuit 34 as transmission signal amplification means is added.
本発明の第５の実施例におけるインターホンシステムによれば、分岐器３に搭載された利得制御回路３５に、受信信号検知回路３３で検知される幹線側伝送信号Ｓ２の減衰量が所定の閾値レベル未満であったとき、受信信号増幅回路３４の利得を可変する機能が付加されていることから、第３の実施例または第４の実施例であるインターホンシステムの作用・効果に加えて、次のような効果を奏する。すなわち、幹線側伝送信号Ｓ２の減衰量が例えば、幹線Ｌ１の線路長の長さに比例して所定の閾値レベル未満である場合、その減衰量に対応させた利得で受信信号増幅回路３４を経由して増幅することにより、増幅後の幹線側伝送信号Ｓ２を受信する特定の端末器（居室親機）２では、幹線側伝送信号Ｓ２に組込まれた各種データ（呼出データ、映像データ、音声データ）に基づく正常な動作を行うことができ、誤動作の発生を防止することができる。
［実施例６］
この実施例においては、前述の第３の実施例乃至第５の実施例の何れかの実施例であるインターホンシステムの伝送信号増幅手段としての受信信号増幅回路３４に、図３に示すように、利得制御手段としての利得制御回路３５の利得レベルに対応させて幹線側伝送信号Ｓ２の波形補正を実行するイコライザ機能が付加されている。
According to the intercom system in the fifth embodiment of the present invention, the gain control circuit 35 mounted on the branching unit 3 has the attenuation amount of the main transmission signal S2 detected by the reception signal detection circuit 33 at a predetermined threshold level. Since the function of changing the gain of the reception signal amplifying circuit 34 is added when it is less than the above, in addition to the operation and effect of the interphone system of the third embodiment or the fourth embodiment, The effect is produced. That is, when the attenuation amount of the main transmission signal S2 is, for example, less than a predetermined threshold level in proportion to the length of the main line L1, the reception signal amplification circuit 34 passes through the gain corresponding to the attenuation amount. In the specific terminal device (room base unit) 2 that receives the amplified trunk-side transmission signal S2 by amplification, various data (call data, video data, voice data) incorporated in the trunk-side transmission signal S2 are received. ) Can be performed normally, and the occurrence of malfunctions can be prevented.
[Example 6]
In this embodiment, as shown in FIG. 3, the reception signal amplification circuit 34 as the transmission signal amplification means of the interphone system which is any one of the third to fifth embodiments described above, An equalizer function is added to perform waveform correction of the main transmission signal S2 in correspondence with the gain level of the gain control circuit 35 as gain control means.
同図において、分図（ａ）は波形整形前の信号減衰量の特性、分図（ｂ）は波形成形後の信号減衰量の特性を示している。ここで、横軸は周波数、縦軸は利得レベルを示しており、利得レベルの高い領域、すなわち信号の減衰量が大きい領域と、利得レベルの低い領域、すなわち信号の減衰量が小さい領域は遮断帯域として遮断することで幹線側伝送信号Ｓ２における通過帯域の波形補正が図られている。 In the same figure, a part (a) shows the characteristic of the signal attenuation before waveform shaping, and part (b) shows the characteristic of the signal attenuation after waveform shaping. Here, the horizontal axis indicates the frequency, and the vertical axis indicates the gain level. The high gain level region, that is, the high signal attenuation region, and the low gain level region, that is, the low signal attenuation region are blocked. By blocking as a band, the waveform correction of the pass band in the main line side transmission signal S2 is achieved.
本発明の第６の実施例におけるインターホンシステムによれば、分岐器３に搭載された受信信号増幅回路３４に利得制御回路３５の利得レベルに対応させて幹線側伝送信号Ｓ２の波形補正を実行するイコライザ機能が付加されていることから、第３の実施例乃至第５の実施例の何れかの実施例であるインターホンシステムの作用・効果に加えて、幹線側伝送信号Ｓ２の波形補正により、幹線側伝送信号Ｓ２の平滑化を図ることができる。 According to the intercom system of the sixth embodiment of the present invention, the received signal amplification circuit 34 mounted on the branching device 3 is subjected to waveform correction of the main transmission signal S2 in correspondence with the gain level of the gain control circuit 35. Since the equalizer function is added, in addition to the operation and effect of the intercom system according to any one of the third to fifth embodiments, the main line is corrected by correcting the waveform of the main transmission signal S2. The side transmission signal S2 can be smoothed.
以上、述べたように、本発明のインターホンシステムにおいては、特定の実施の形態をもって説明してきたが、この形態に限定されるものでなく、本発明の効果を奏する限り、これまで知られた如何なる構成の、インターホンシステム、例えば、次のようなインターホンシステムであっても採用できることはいうまでもないことである。 As described above, the intercom system of the present invention has been described with a specific embodiment. However, the present invention is not limited to this embodiment, and as long as the effects of the present invention can be obtained, any one known so far can be obtained. It goes without saying that an interphone system having a configuration, for example, the following interphone system can be adopted.
第１に、前述の実施例においては、幹線と分岐線との分岐点に分岐器を挿入した例について述べているが、当該分岐器に代えて分配器を挿入しても本発明と同等の効果を奏する。 1stly, in the above-mentioned Example, although the example which inserted the branching device in the branch point of a trunk line and a branching line was described, even if it replaces with the said branching device and inserts a distributor, it is equivalent to this invention There is an effect.
第２に、前述の実施例においては、主装置を集合玄関機として使用する場合について述べているが、集合玄関機に制御機を接続し、当該制御機を主装置として使用しても本発明と同等の効果を奏する。 Secondly, in the above-described embodiment, the case where the main apparatus is used as a collective entrance machine has been described. However, the present invention may be applied even if a controller is connected to the collective entrance machine and the controller is used as the main apparatus. Has the same effect as
第３に、前述の実施例における分岐線側伝送信号Ｓ１が検知処理するために必要な時間分や幹線側伝送信号Ｓ２の減衰量が所定の閾値レベル等の数値は一例であって、これに限定されない。 Thirdly, numerical values such as a predetermined threshold level for the time required for the branch line side transmission signal S1 to detect and the attenuation amount of the main line side transmission signal S2 in the above-described embodiment are examples. It is not limited.
１・・・主装置
２（２ａ、２ｂ、・・・、２ｎ）・・・端末器
３（３ａ、３ｂ、・・・、３ｎ）分岐器
３１・・・送信信号検知回路（送信信号検知手段）
３２・・・送信信号出力回路（送信信号出力手段）
３２ａ・・・送信信号出力インピーダンス可変回路
（送信信号出力インピーダンス可変手段）
３３・・・受信信号検知回路（受信信号検知手段）
３４・・・受信信号増幅回路（伝送信号増幅手段）
３５・・・利得制御回路（利得制御手段）
Ｌ１・・・幹線
Ｌ２（Ｌ２ａ、Ｌ２ｂ、・・・、Ｌ２ｎ）分岐線
Ｔ１Ａ、Ｔ１Ｂ（Ｔ１ａ、Ｔ１ｂ、Ｔ１ａ´、Ｔ１ｂ´）・・・幹線端子
Ｔ２ａ、Ｔ２ｂ・・・分岐線端子
DESCRIPTION OF SYMBOLS 1 ... Main apparatus 2 (2a, 2b, ..., 2n) ... Terminal device 3 (3a, 3b, ..., 3n) Branch device 31 ... Transmission signal detection circuit (Transmission signal detection means )
32. Transmission signal output circuit (transmission signal output means)
32a ... Transmission signal output impedance variable circuit (transmission signal output impedance variable means)
33 ... Received signal detection circuit (received signal detection means)
34... Received signal amplification circuit (transmission signal amplification means)
35... Gain control circuit (gain control means)
L1 ... trunk line L2 (L2a, L2b, ..., L2n) branch lines T1A, T1B (T1a, T1b, T1a ', T1b') ... trunk line terminals T2a, T2b ... branch line terminals
Claims (5)
前記複数の分岐器は、自己の端末器から前記分岐線を経由して送信されてくる分岐線側伝送信号を検知し、自己の端末器から送信される前記分岐線側伝送信号が前記主装置に対するものであるか否かを検知する送信信号検知手段と、
自己の端末器から前記主装置に対し送信される前記分岐線側伝送信号を検知している間、前記送信信号検知手段から出力される制御信号によって前記幹線の特性インピーダンスで前記分岐線側伝送信号を前記幹線端子に送出するために制御される送信信号出力インピーダンス可変手段と、
前記幹線端子から受信され前記分岐線端子に送出される前記幹線側伝送信号が一次巻線から入力されるトランス（ただし、一次巻線の巻数、二次巻線の巻数との比である巻線比ｎをｎ＞１にする）と、
前記二次巻線からの前記幹線側伝送信号を検知する受信信号検知手段と、
前記幹線側伝送信号を増幅する伝送信号増幅手段と、
前記伝送信号増幅手段による増幅利得を制御する利得制御手段とを備えることを特徴とするインターホンシステム。 A main line extending from the main unit, a plurality of branch lines branched from the main line and connected to a plurality of terminals, and the main line and the plurality of lines for signal transmission between the main unit and the terminals In an interphone system comprising a plurality of branching units each having a trunk line terminal to which the trunk line is connected and a branch line terminal to which the branch line is connected.
Wherein the plurality of splitter detects the branch line side transmit signal transmitted via the branch line from the own terminal device, the branch line side transmit signal is the main device to be transmitted from the own terminal device Transmission signal detection means for detecting whether or not
While detecting the branch line side transmission signal transmitted from its own terminal to the main unit, the branch line side transmission signal is detected with the characteristic impedance of the trunk line by the control signal output from the transmission signal detecting means. Transmitting signal output impedance variable means controlled to send to the main line terminal,
Transformer in which the main line side transmission signal received from the main line terminal and sent to the branch line terminal is input from the primary winding (note that the winding is a ratio of the number of turns of the primary winding and the number of turns of the secondary winding. Ratio n to n> 1),
A reception signal detection means for detecting the main transmission signal from the secondary winding;
Transmission signal amplification means for amplifying the trunk side transmission signal;
An intercom system comprising: gain control means for controlling amplification gain by the transmission signal amplification means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013207047A JP6276957B2 (en) | 2013-10-02 | 2013-10-02 | Intercom system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013207047A JP6276957B2 (en) | 2013-10-02 | 2013-10-02 | Intercom system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2015073173A JP2015073173A (en) | 2015-04-16 |
| JP6276957B2 true JP6276957B2 (en) | 2018-02-07 |
Family
ID=53015266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2013207047A Active JP6276957B2 (en) | 2013-10-02 | 2013-10-02 | Intercom system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6276957B2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3195697B2 (en) * | 1993-10-08 | 2001-08-06 | 松下電器産業株式会社 | Two-wire audio / video signal multiplex transmission system |
| JP3054318B2 (en) * | 1994-08-26 | 2000-06-19 | トヨタ自動車株式会社 | Two-way communication circuit |
| JP3008873B2 (en) * | 1997-02-03 | 2000-02-14 | 株式会社日立製作所 | Signal transmission equipment |
| JPH11163950A (en) * | 1997-11-28 | 1999-06-18 | Keyence Corp | Branch line branching device |
| JP5865123B2 (en) * | 2012-02-29 | 2016-02-17 | アイホン株式会社 | Apartment house intercom device |
-
2013
- 2013-10-02 JP JP2013207047A patent/JP6276957B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2015073173A (en) | 2015-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8082570B2 (en) | Method and apparatus for a self-terminating signal path | |
| US20120140949A1 (en) | Conference system for independently adjusting audio parameters | |
| US9479222B2 (en) | Dynamic mode selection for MIMO powerline devices | |
| US11050459B2 (en) | Digital subscriber line access multiplexer for sending communication signals to customer devices | |
| JP6276957B2 (en) | Intercom system | |
| JP5792423B1 (en) | Transfer device, electronic signature key and interface detection system | |
| US8077631B2 (en) | Method and terminal for transmitting uplink data | |
| US3875350A (en) | Self-balancing hybrid circuit | |
| JP2005333496A (en) | Interphone system | |
| CN111294086A (en) | Gain control method and communication system for a communication system | |
| JP5852944B2 (en) | Apartment house intercom device | |
| CN102104455A (en) | Remote-end multiple input multiple output method, distributing cabinet and system | |
| JPS62501811A (en) | Data bus pilot tone | |
| TW201515385A (en) | Return path noise reducing amplifier with bypass signal | |
| JP2004135185A (en) | Communication system | |
| JP6061247B2 (en) | Apartment house intercom device | |
| US8693710B2 (en) | Apparatus for preventing leakage of a weak signal from a speaker | |
| US1997222A (en) | Telephone repeater | |
| JP2018088593A (en) | Collective housing interphone system | |
| US1594453A (en) | Transmission circuits | |
| TW201803290A (en) | Time division duplexing receiver with constant impedance for a broadband line terminal with asynchronous transmission | |
| US20170359130A1 (en) | Prevention of Crosstalk During Single-Ended Line Testing | |
| JPH01174019A (en) | Audio teleconference equipment | |
| CN101300783A (en) | Modules for communication signal distribution | |
| JPH0456555A (en) | Gain control method for doublex amplifier in telephone set circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20160630 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20170215 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20170314 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20170413 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20171003 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20171201 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20171226 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20180115 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6276957 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |