JPS58694B2 - tuner device - Google Patents
tuner deviceInfo
- Publication number
- JPS58694B2 JPS58694B2 JP212778A JP212778A JPS58694B2 JP S58694 B2 JPS58694 B2 JP S58694B2 JP 212778 A JP212778 A JP 212778A JP 212778 A JP212778 A JP 212778A JP S58694 B2 JPS58694 B2 JP S58694B2
- Authority
- JP
- Japan
- Prior art keywords
- attenuator
- output
- detector
- frequency amplifier
- intermediate frequency
- 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.)
- Expired
Links
- 230000002238 attenuated effect Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 239000000284 extract Substances 0.000 claims description 2
- 230000005684 electric field Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Superheterodyne Receivers (AREA)
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Description
【発明の詳細な説明】
一般にラジオ受信機、ステレオ装置、テレビジョン受像
機等の受信機において、過大なアンテナ入力信号に対し
てはＲＦ増巾器やミキサーおよび中間周波増巾器の増巾
素子それぞれのダイナミックレンジに制約されて、ミキ
サー出力もしくは中間周波増巾器の出力が飽和する。Detailed Description of the Invention Generally, in receivers such as radio receivers, stereo equipment, television receivers, etc., in response to excessive antenna input signals, an RF amplifier, a mixer, and an amplifying element of an intermediate frequency amplifier are used. Constrained by their respective dynamic ranges, the mixer output or intermediate frequency amplifier output saturates.
したがって、この様な過大なアンテナ入力領域において
は、アンテナ入力とミキサー出力もしくは中間周波増巾
型出力の関係の直線性は存在しない。Therefore, in such an excessively large antenna input region, there is no linearity in the relationship between the antenna input and the mixer output or intermediate frequency amplification type output.
このような問題点は、中間周波信号の一部を取出してア
ンテナ入力の電界強度を指示する電界強度指示計の指示
のダイナミックレンジを制約するものである。These problems limit the dynamic range of the field strength indicator, which extracts a portion of the intermediate frequency signal to indicate the field strength of the antenna input.
例えば現状のステレオ受信機の指示計の直線指示限界は
８０ｄＢμ程度であり実電界では１００ｄＢ以上のアン
テナ入力信号も存在するので、現状の指示計は実用的に
満足できるものではない。For example, the linear indication limit of the current indicator of a stereo receiver is about 80 dBμ, and in an actual electric field there are antenna input signals of 100 dB or more, so the current indicator is not practically satisfactory.
そこで、電界強度指示計等に前置される過大なアンテナ
入力信号に対しても弱入力信号時と同じように中間周波
出力が直接的関係を持つようなダイナミックレンジの広
いチューナ装置を構成することが望まれる。Therefore, it is necessary to construct a tuner device with a wide dynamic range in which the intermediate frequency output has a direct relationship with an excessive antenna input signal installed in front of a field strength indicator, etc., in the same way as with a weak input signal. is desired.
本発明は上述の要望に鑑みなされたものであり、以下、
本発明を実施例の図面と共に説明する。The present invention was made in view of the above-mentioned demands, and the following:
The present invention will be explained with reference to drawings of embodiments.
第１図において、アンテナ１に到来する信号は０Ｎ−Ｏ
ＦＦアッテネータ２〔ＯＮ（減衰）状態と０ＦＦ（無減
衰）状態の切換が外部制御できるアッテネータ〕を介し
て高周波増巾器３で増巾され、ミキサー４で局部発振器
５の局発信号とビートがとられ、中間周波信号を発生す
る。In Figure 1, the signal arriving at antenna 1 is 0N-O
The signal is amplified by the high frequency amplifier 3 via the FF attenuator 2 [an attenuator whose switching between ON (attenuation) state and 0FF (non-attenuation) state can be controlled externally], and the local oscillator 5's local signal and beat are amplified by the mixer 4. and generates an intermediate frequency signal.
この中間周波信号は中間周波増巾器６で増巾され、０Ｎ
−ＯＦＦアッテネータ７を介して検波器８に入力され、
得られた検波出力は出力端子９に出力される。This intermediate frequency signal is amplified by an intermediate frequency amplifier 6, and is amplified by 0N
- input to the detector 8 via the OFF attenuator 7,
The obtained detection output is output to the output terminal 9.
検波器８は中間周波信号のレベルに応じて直流出力を得
るものである。The detector 8 obtains a DC output according to the level of the intermediate frequency signal.
以上で信号処理ラインを構成し、出力端子９の出力は表
示手段（図示せず）は送られ電界強度表示が可能となる
。The signal processing line is configured as described above, and the output from the output terminal 9 is sent to display means (not shown), making it possible to display the electric field strength.
一方、上記信号処理ラインのダイナミックレンジを拡大
させる制御ラインは、まず、検波器８の出力の一部を取
出し、その電圧レベルと比較基準レベル設定器１０（以
下レベル設定器と略す）で設定された電圧レベルを比較
器１１で比較させ、その比較出力はアッテネータ用ドラ
イバー１２を介して０Ｎ−ＯＦＦアッテネータ２に伝達
され、０Ｎ−ＯＦＦアッテネータ２のＯＮとＯＦＦを制
御する信号となる制御ラインを構成する。On the other hand, the control line that expands the dynamic range of the signal processing line first takes out a part of the output of the detector 8, and sets the voltage level and comparison reference level setter 10 (hereinafter abbreviated as the level setter). The voltage levels obtained are compared by a comparator 11, and the comparison output is transmitted to the 0N-OFF attenuator 2 via the attenuator driver 12, forming a control line that becomes a signal for controlling ON and OFF of the 0N-OFF attenuator 2. do.
一方、比較器１１の比較出力の一部を信号反転器１３で
反転して、その反転出力はアッテネータ用ドライバー１
４を介して０Ｎ−ＯＦＦアッテネータ７に伝達され０Ｎ
−ＯＦＦアッテネータ７のＯＮとＯＦＦを制御する信号
となる制御ラインをも構成する。On the other hand, a part of the comparison output of the comparator 11 is inverted by the signal inverter 13, and the inverted output is sent to the attenuator driver 1.
4 to the 0N-OFF attenuator 7.
-OFF It also constitutes a control line that serves as a signal for controlling ON and OFF of the attenuator 7.
次にその動作を第２図と共に説明する。Next, its operation will be explained with reference to FIG.
まずレベル設定器１０の設定レベルは第２図のアンテナ
入力電圧ｖ１を検波器８で検波した時の検波出力レベル
と同等に設定する。First, the setting level of the level setter 10 is set to be equal to the detection output level when the antenna input voltage v1 in FIG. 2 is detected by the detector 8.
アンテナ入力電圧がｖ１以下の場合は比較器１１の出力
は第２図りに示すようにＬｏｗ（以下りと略す）となり
、ｖ１を超える場合はＨｉｇｈ（以下Ｈと略す）となる
。When the antenna input voltage is less than v1, the output of the comparator 11 becomes Low (hereinafter abbreviated as less) as shown in the second diagram, and when it exceeds v1, it becomes High (hereinafter abbreviated as H).
また、０Ｎ−ＯＦＦアッテネータ２，７は制御信号がＨ
の時はＯＮ状態に、Ｌの時はＯＦＦ状態になる。Furthermore, the control signal for the 0N-OFF attenuators 2 and 7 is H.
When it is, it is in the ON state, and when it is L, it is in the OFF state.
したがって、アンテナ入力電圧がｖ１以下の時、０Ｎ−
ＯＦＦアッテネータ２はＯＦＦ状態に、０Ｎ−ＯＦＦア
ッテネータ７は反転器１３の働きで第２図Ｅに示すよう
にＯＮ状態になる。Therefore, when the antenna input voltage is less than v1, 0N-
The OFF attenuator 2 is turned OFF, and the ON-OFF attenuator 7 is turned ON by the action of the inverter 13 as shown in FIG. 2E.
一方、アンテナ入力電圧がｖ１を超える時、０Ｎ−ＯＦ
Ｆアッテネータ２はＯＮ状態に、０Ｎ−ＯＦＦアッテネ
ータ７はＯＦＦ状態になる。On the other hand, when the antenna input voltage exceeds v1, 0N-OF
The F attenuator 2 is in the ON state, and the 0N-OFF attenuator 7 is in the OFF state.
また０Ｎ−ＯＦＦアッテネータ２，７それぞれの減衰量
は同等とする。Further, it is assumed that the attenuation amounts of the 0N-OFF attenuators 2 and 7 are the same.
ｖ１値の決定は、第２図Ａに示すような、ミキサー４の
出力が本発明の措置を施さない場合の飽和点以下で定め
るものとする。The v1 value is determined to be below the saturation point of the output of the mixer 4 when the measure of the present invention is not applied, as shown in FIG. 2A.
いうまでもなく本発明措置を施さない場合の出力端９の
出力信号のダイナミックレンジは中間周波増巾器６のダ
イナミックレンジが充分大とする場合ミキサー４の出力
飽和に制約される。Needless to say, the dynamic range of the output signal at the output end 9 without the measures of the present invention is limited by the output saturation of the mixer 4 if the dynamic range of the intermediate frequency amplifier 6 is sufficiently large.
今、アンテナ入力が零から上昇するものとして、ｖ１に
達した時点で０Ｎ−ＯＦＦアッテネータ２がＯＮ状態に
、０Ｎ−ＯＦＦアッテネータ７がＯＦＦ状態に状態変化
する。Now, assuming that the antenna input increases from zero, when it reaches v1, the ON-OFF attenuator 2 changes to the ON state, and the ON-OFF attenuator 7 changes to the OFF state.
そして更にアンテナ入力がｖ２まで上昇するものとする
と、０Ｎ−ＯＦＦアッテネータ２の出力信号電圧は第２
図Ｂのように、アンテナ入力がｖ１の時に所要の減衰量
Δｖだけ減衰してｖ３まで低下し、再びアンテナ入力が
ｖ２まで上昇して出力電圧が再びｖ１までに達する。Then, if the antenna input further increases to v2, the output signal voltage of 0N-OFF attenuator 2 becomes
As shown in FIG. B, when the antenna input is v1, it is attenuated by a required attenuation amount Δv and drops to v3, and then the antenna input increases to v2 again and the output voltage reaches v1 again.
したがって、第２図Ａ、Ｂから明確なようにミキサー４
の出力が飽和するｖ１以上の過大信号は高周波増巾器３
の入力には印加されないことになる。Therefore, as is clear from Fig. 2A and B, the mixer 4
An excessive signal of v1 or higher, at which the output of
will not be applied to the input of
一方、０Ｎ−ＯＦＦアッテネータ７は反対にアンテナ入
力がｖ１の時にＯＦＦ状態に状態変化し、０Ｎ−ＯＦＦ
アッテネータ２の減衰量を補正するので０Ｎ−ＯＦＦア
ッテネータ７の出力電圧は第２図Ｃに示すようにアンテ
ナ入力電圧ｖ２まで直線的に増加させることができる。On the other hand, the 0N-OFF attenuator 7 changes to the OFF state when the antenna input is v1, and the 0N-OFF attenuator 7 changes to the OFF state when the antenna input is v1.
Since the amount of attenuation of the attenuator 2 is corrected, the output voltage of the ON-OFF attenuator 7 can be increased linearly up to the antenna input voltage v2 as shown in FIG. 2C.
したがって、この出力を検波器８で検波すれば出力端子
９にはアンテナ入力ｖ２まで直線的ダイナミックレンジ
を有する直流出力が得られる。Therefore, if this output is detected by the detector 8, a DC output having a linear dynamic range up to the antenna input v2 can be obtained at the output terminal 9.
以上のようにして、アンテナ入力ｖ１以上で出力電圧が
飽和する高周波増巾器３およびミキサー４を有するにも
かかわらず、アンテナ入力ｖ２まで直線的な検波出力を
得るダイナミックレンジの広いチューナ装置が構成でき
る。As described above, a tuner device with a wide dynamic range that obtains a linear detection output up to the antenna input v2 is configured despite having the high frequency amplifier 3 and the mixer 4 whose output voltage is saturated at an antenna input v1 or higher. can.
したがって、このようなチューナ装置を用いて、出力端
子９に直流電圧のレベル表示手段を接続すれば、アンテ
ナ入力が過大なレンジまでの電界強度を問題なく表示す
ることができ、極めてダイナミックレンジの広い電界強
度測定装置を構成することができる。Therefore, if such a tuner device is used and a DC voltage level display means is connected to the output terminal 9, the electric field strength up to a range where the antenna input is excessive can be displayed without any problem, and an extremely wide dynamic range can be obtained. An electric field strength measurement device can be configured.
またアンテナ１．０Ｎ−ＯＦＦアッテネータ２、高周波
増巾器３、ミキサー４、局部発振器５、および中間周波
増巾器６をラジオ受信機、ステレオ受信機として併用し
、中間周波増巾器６の出力をＡＭ検波器もしくはＦＭ検
波器に接続して音声再生しても、アンテナ入力が弱信号
時でもＳ／Ｎを損うことなく受信することができ、更に
過大なアンテナ入力信号に対してはアッテネータが有効
に働いて受信機の特性（例えばＦＭ受信時のＡＭ抑圧比
、歪率特性等）を劣化させることなく良質の受信が可能
となるものである。In addition, the antenna 1.0N-OFF attenuator 2, high frequency amplifier 3, mixer 4, local oscillator 5, and intermediate frequency amplifier 6 are used together as a radio receiver and a stereo receiver, and the output of the intermediate frequency amplifier 6 is Even if you connect it to an AM detector or FM detector and play audio, it can be received without losing S/N even when the antenna input is a weak signal. works effectively to enable high-quality reception without degrading the characteristics of the receiver (for example, AM suppression ratio, distortion rate characteristics, etc. during FM reception).
【図面の簡単な説明】
第１図は本発明のチューナ装置の一構成例を示すブロッ
ク図、第２図はその動作説明図である。
２．７・・・・・・０Ｎ−ＯＦＦアッテネータ、３・・
・・・・高周波増巾器、４・・・・・・ミキサー、５・
・・・・・局部発振器、６・・・・・・中間周波増巾器
、８・・・・・・検波器、１０・・・・・・レベル設定
器、１１・・・・・・比較器、１２，１４・・・・・・
アッテネータ用ドライバー、１３・・・・・・信号反転
器。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration example of a tuner device according to the present invention, and FIG. 2 is an explanatory diagram of its operation. 2.7...0N-OFF attenuator, 3...
...High frequency amplifier, 4...Mixer, 5.
... Local oscillator, 6 ... Intermediate frequency amplifier, 8 ... Detector, 10 ... Level setter, 11 ... Comparison Vessel, 12, 14...
Attenuator driver, 13...Signal inverter.
Claims (1)
の０Ｎ−ＯＦＦアッテネータと、上記高周波増巾器の出
力を周波数変換する周波数変換器と、この周波数変換器
から得られる中間周波出力を増巾する中間周波増巾器と
、その中間周波増巾器に後置された第２の０Ｎ−ＯＦＦ
アッテネータと、その第２のアッテネータの出力を検波
する検波器と、その検波器の出力を取出して所定のレベ
ルき比較してその大小比較をさせる比較器の出力で上記
第１の０Ｎ−ＯＦＦアッテネータをドライブするドライ
バーを具有する第１の制御ループと、上記比較器の比較
出力を反転させる反転器と、その反転出力で上記第２の
０Ｎ−ＯＦＦアッテネータをドライブするドライバーを
具有する第２の制御ループを備え、上記アンテナに入力
される信号のレベルによって得る上記検波器の検波出力
が上記比較器の比較基準レベルよりも小さいとき上記第
１の０Ｎ−ＯＦＦアッテネータは無減衰状態で、上記第
２の０Ｎ−ＯＦＦアッテネータは減衰状態となり、一方
上記検波出力が比較基準レベルよりも大きいとき上記第
１の０Ｎ−ＯＦＦアッテネータは減衰状態で、上記第２
の０Ｎ−ＯＦＦアッテネータは無減衰状態となるように
して、上記検波器の検波出力のダイナミックレンジを拡
大させることを特徴とするチューナ装置。1 The first antenna is connected to the antenna before the high frequency amplifier
a 0N-OFF attenuator, a frequency converter that converts the frequency of the output of the high frequency amplifier, an intermediate frequency amplifier that amplifies the intermediate frequency output obtained from the frequency converter, and the intermediate frequency amplifier. a second 0N-OFF followed by
an attenuator, a detector that detects the output of the second attenuator, and an output of the comparator that extracts the output of the detector and compares it to a predetermined level to compare the magnitude of the output of the first 0N-OFF attenuator. a first control loop having a driver for driving the attenuator, an inverter for inverting the comparison output of the comparator, and a second control loop having a driver for driving the second ON-OFF attenuator with the inverted output. When the detection output of the wave detector obtained by the level of the signal input to the antenna is smaller than the comparison reference level of the comparator, the first 0N-OFF attenuator is in a non-attenuated state, and the second The 0N-OFF attenuator is in an attenuated state, while when the detection output is greater than the comparison reference level, the first 0N-OFF attenuator is in an attenuated state, and the second 0N-OFF attenuator is in an attenuated state.
A tuner device characterized in that the ON-OFF attenuator is set in a non-attenuated state to expand the dynamic range of the detected output of the detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP212778A JPS58694B2 (en) | 1978-01-11 | 1978-01-11 | tuner device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP212778A JPS58694B2 (en) | 1978-01-11 | 1978-01-11 | tuner device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5494814A JPS5494814A (en) | 1979-07-26 |
| JPS58694B2 true JPS58694B2 (en) | 1983-01-07 |
Family
ID=11520667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP212778A Expired JPS58694B2 (en) | 1978-01-11 | 1978-01-11 | tuner device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58694B2 (en) |
-
1978
- 1978-01-11 JP JP212778A patent/JPS58694B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5494814A (en) | 1979-07-26 |
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