JPS6210570U - - Google Patents
Info
- Publication number
- JPS6210570U JPS6210570U JP10084785U JP10084785U JPS6210570U JP S6210570 U JPS6210570 U JP S6210570U JP 10084785 U JP10084785 U JP 10084785U JP 10084785 U JP10084785 U JP 10084785U JP S6210570 U JPS6210570 U JP S6210570U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- input signal
- switching
- switching operation
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000005236 sound signal Effects 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案による音声検波回路の一部ブロ
ツク図を含む回路図、第２図はテレビ電波から映
像信号および音声信号をとり出す回路のブロツク
図、第３図、第４図は従来の音声検波回路のブロ
ツク図、第５図は周波数検波回路の検波特性を示
す図である。
２８…周波数電圧変換回路、２９，３１…切換
回路、４９…音声検波回路、５０…共振回路。
Figure 1 is a circuit diagram including a partial block diagram of the audio detection circuit according to the present invention, Figure 2 is a block diagram of a circuit for extracting video and audio signals from television radio waves, and Figures 3 and 4 are conventional circuit diagrams. FIG. 5 is a block diagram of the audio detection circuit, and is a diagram showing the detection characteristics of the frequency detection circuit. 28... Frequency voltage conversion circuit, 29, 31... Switching circuit, 49... Audio detection circuit, 50... Resonance circuit.
Claims (1)
か一つの信号を入力して入力した信号の周波数に
応じた変換電圧を出力する周波数電圧変換回路と
、前記変換電圧に応じて切換動作をする切換回路
と、前記入力した信号を周波数弁別する弁別回路
とを備え、前記切換回路の切換動作によつて前記
弁別回路の共振周波数を前記入力した信号の周波
数に合わせて切換えるように構成したことを特徴
とするＰＡＬ方式テレビ信号の音声検波回路。 a frequency-voltage conversion circuit that inputs one of a plurality of high-frequency signals having different frequencies and outputs a converted voltage according to the frequency of the input signal; and a switching circuit that performs a switching operation according to the converted voltage. , further comprising a discrimination circuit that discriminates the frequency of the input signal, and configured such that the resonant frequency of the discrimination circuit is switched in accordance with the frequency of the input signal by a switching operation of the switching circuit. Audio detection circuit for PAL television signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10084785U JPS6210570U (en) | 1985-07-02 | 1985-07-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10084785U JPS6210570U (en) | 1985-07-02 | 1985-07-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6210570U true JPS6210570U (en) | 1987-01-22 |
Family
ID=30971044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10084785U Pending JPS6210570U (en) | 1985-07-02 | 1985-07-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6210570U (en) |
-
1985
- 1985-07-02 JP JP10084785U patent/JPS6210570U/ja active Pending