JPH0216624U - - Google Patents
Info
- Publication number
- JPH0216624U JPH0216624U JP1988095587U JP9558788U JPH0216624U JP H0216624 U JPH0216624 U JP H0216624U JP 1988095587 U JP1988095587 U JP 1988095587U JP 9558788 U JP9558788 U JP 9558788U JP H0216624 U JPH0216624 U JP H0216624U
- Authority
- JP
- Japan
- Prior art keywords
- audio
- supplied
- terminal
- detector
- frequency signal
- 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
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Noise Elimination (AREA)
Description
第１図は本考案になる音声ミユート回路の一実
施例を示すブロツク図、第２図及び第３図は音声
ＦＭ検波回路の動作を説明するための図、第４図
は従来の音声ミユート回路のブロツク図である。
１……アンテナ、２……チユーナ、３……ＩＦ
回路、４……映像検波回路、５……音声ＦＭ検波
回路、５ａ……帰還端子、５ｂ……検波出力端子
、６……出力アンプ、６ａ……ミユート端子、７
……スピーカ、８……積分器、９……比較器、Ｃ
１……コンデンサ、Ｑ１……ＮＰＮトランジスタ
、Ｒ１，Ｒ３，Ｒ４……抵抗、Ｒ２……可変抵抗
、ｆｓ……音声キヤリア周波数。
FIG. 1 is a block diagram showing an embodiment of the audio mute circuit according to the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the audio FM detection circuit, and FIG. 4 is a conventional audio mute circuit. FIG. 1...Antenna, 2...Chyuna, 3...IF
Circuit, 4...Video detection circuit, 5...Audio FM detection circuit, 5a...Feedback terminal, 5b...Detection output terminal, 6...Output amplifier, 6a...Mute terminal, 7
... Speaker, 8 ... Integrator, 9 ... Comparator, C
1 ...Capacitor, Q1 ... NPN transistor, R1 , R3 , R4 ...Resistor, R2 ...Variable resistor, fs...Audio carrier frequency.
Claims (1)
され、同調点がその音声キヤリア周波数から所定
量ずれていると共に、帰還端子と出力端子とが接
続されている音声ＦＭ検波器と、 この音声ＦＭ検波器の出力端子から音声低周波
信号が供給される音声出力増幅器と、 前記音声ＦＭ検波器の前記帰還端子から前記音
声低周波信号が供給される積分器と、 この積分器から直流電圧が負極側入力端子に供
給されると共に、基準電圧が正極側入力端子に供
給される比較器と、 前記直流電圧が前記基準電圧以下になつたとき
に、この比較器から供給される電圧によりオンし
、ミユート動作開始信号を前記音声出力増幅器に
供給するスイツチング素子とより構成したことを
特徴とする音声ミユート回路。[Claims for Utility Model Registration] An audio FM detector to which an audio intermediate frequency signal at an audio carrier frequency is supplied, a tuning point is deviated from the audio carrier frequency by a predetermined amount, and a feedback terminal and an output terminal are connected. an audio output amplifier to which the audio low frequency signal is supplied from the output terminal of the audio FM detector; an integrator to which the audio low frequency signal is supplied from the feedback terminal of the audio FM detector; and this integrator. a comparator to which a DC voltage is supplied to the negative input terminal and a reference voltage to the positive input terminal; 1. An audio mute circuit comprising a switching element that is turned on by voltage and supplies a mute operation start signal to the audio output amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988095587U JPH0535628Y2 (en) | 1988-07-19 | 1988-07-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988095587U JPH0535628Y2 (en) | 1988-07-19 | 1988-07-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0216624U true JPH0216624U (en) | 1990-02-02 |
| JPH0535628Y2 JPH0535628Y2 (en) | 1993-09-09 |
Family
ID=31320269
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988095587U Expired - Lifetime JPH0535628Y2 (en) | 1988-07-19 | 1988-07-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0535628Y2 (en) |
-
1988
- 1988-07-19 JP JP1988095587U patent/JPH0535628Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0535628Y2 (en) | 1993-09-09 |
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