JPS604074U - TV audio multiplex signal receiver - Google Patents
TV audio multiplex signal receiverInfo
- Publication number
- JPS604074U JPS604074U JP9544183U JP9544183U JPS604074U JP S604074 U JPS604074 U JP S604074U JP 9544183 U JP9544183 U JP 9544183U JP 9544183 U JP9544183 U JP 9544183U JP S604074 U JPS604074 U JP S604074U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- differential pair
- base
- resistor
- detection circuit
- 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.)
- Granted
Links
Landscapes
- Television Receiver Circuits (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図はテレビ音声多重信号の構成を示す図、第２図は
本考案受信機の要部概略構成を示すブロック図、第３図
はその受信機に使用する副チヤンネル信号検出回路の一
実施例を示す回路ブロック図である。
４・・・・・・第１バンドパスフイルタ、８・・・・・
・第２バンドバスフイルタ、９・・・・・・ＡＭ検波回
路、１０・・・・・・制御信号判別回路、１１・・・・
・・論理回路、７・・・・・・音声信号処理回路、１２
・・・・・・副チヤンネル信号検出回路、１４・・・・
・・包絡線検波回路、１５５・・・・・・レベル比較回
路。Fig. 1 is a diagram showing the structure of a television audio multiplex signal, Fig. 2 is a block diagram showing the schematic structure of the main parts of the receiver of the present invention, and Fig. 3 is an implementation of the sub-channel signal detection circuit used in the receiver. FIG. 2 is a circuit block diagram showing an example. 4...First band pass filter, 8...
・Second bandpass filter, 9...AM detection circuit, 10...control signal discrimination circuit, 11...
...Logic circuit, 7...Audio signal processing circuit, 12
...Sub channel signal detection circuit, 14...
...Envelope detection circuit, 155...Level comparison circuit.
Claims (3)
検出する検出回路の出力及び上記多重信号の内容を示す
制御信号の判別を行なう判別回路の出力に応じて上記多
重信号の再生モードを切換える音声多重受信機に於いて
、前記検出回路の検出感度を電源投入直後は高く、定常
動作状態で低くなるように切換えるようにしたことを特
徴とするテレビ音声多重信号受信機。(1) Audio that switches the reproduction mode of the multiplexed signal in accordance with the output of a detection circuit that detects the presence or absence of a sub-channel signal of the multiplexed television signal and the output of a discrimination circuit that determines a control signal indicating the content of the multiplexed signal. 1. A television audio multiplex signal receiver, characterized in that the detection sensitivity of the detection circuit is switched such that it is high immediately after power is turned on and becomes low during steady operation.
対トランジスタを備え、その差動対トランジスタの各々
のベースに副チャンネル信号を入力し、且つ、その一方
のベースに入力される副チャンネル信号の大きさを電源
投入直後と定常動作状態とで切換えることによって検出
感度の切換えを行なうようにした登録請求の範囲第１項
記載のテレビ音声多重信号受信機。(2) The detection circuit includes a differential pair of transistors for amplifying the subchannel signal, and inputs the subchannel signal to the base of each of the differential pair transistors, and also inputs the subchannel signal to the base of one of the differential pair transistors. 2. The television audio multiplex signal receiver according to claim 1, wherein the detection sensitivity is switched by switching the signal magnitude between immediately after power-on and during steady operation.
基準電位点との間に第１の抵抗とコンデンサが直列に接
続され、且つ、上記ベースに第２の抵抗を介して副チャ
ンネル信号が入力されると共に、その第２の抵抗に並列
に電源投入直後の過渡状態でのみオンとなるスイッチン
グトランジスタが接続されていることを特徴とする請求 受信機。(3) The differential pair transistor has a first resistor and a capacitor connected in series between one base and a reference potential point, and a sub-channel signal is connected to the base via a second resistor. A switching transistor is connected in parallel to the second resistor and turns on only in a transient state immediately after power is turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9544183U JPS604074U (en) | 1983-06-20 | 1983-06-20 | TV audio multiplex signal receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9544183U JPS604074U (en) | 1983-06-20 | 1983-06-20 | TV audio multiplex signal receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS604074U true JPS604074U (en) | 1985-01-12 |
| JPS6122386Y2 JPS6122386Y2 (en) | 1986-07-04 |
Family
ID=30227919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9544183U Granted JPS604074U (en) | 1983-06-20 | 1983-06-20 | TV audio multiplex signal receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS604074U (en) |
-
1983
- 1983-06-20 JP JP9544183U patent/JPS604074U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6122386Y2 (en) | 1986-07-04 |
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