JPS6352356U - - Google Patents
Info
- Publication number
- JPS6352356U JPS6352356U JP14580586U JP14580586U JPS6352356U JP S6352356 U JPS6352356 U JP S6352356U JP 14580586 U JP14580586 U JP 14580586U JP 14580586 U JP14580586 U JP 14580586U JP S6352356 U JPS6352356 U JP S6352356U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- audio
- signal
- video
- detection
- 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 16
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 239000000284 extract Substances 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案のテレビジヨン受像機の音声検
波装置の一実施例を示すブロツク図、第２図はチ
ユーナ回路から得られる中間周波信号の周波数特
性を説明する説明図、第３図は従来のインターキ
ヤリア方式の音声検波装置を示すブロツク図、第
４図及び第５図は他の従来例を示すブロツク図で
ある。
１１……映像中間周波増幅回路、１２……映像
検波回路、１３，２２……ＡＧＣ回路、１４Ａ…
…音声中間周波増幅回路、１７Ａ……音声検波回
路、１８……４．５ＭＨｚバンドパスフイルタ、
１９……リミツタアンプ、２０……ＦＭ検波回路
、２１……４．５ＭＨｚレベル検波回路。
Fig. 1 is a block diagram showing an embodiment of the audio detection device for a television receiver according to the present invention, Fig. 2 is an explanatory drawing explaining the frequency characteristics of an intermediate frequency signal obtained from a tuner circuit, and Fig. 3 is a conventional one. FIGS. 4 and 5 are block diagrams showing other conventional examples. 11...Video intermediate frequency amplification circuit, 12...Video detection circuit, 13, 22...AGC circuit, 14A...
...Audio intermediate frequency amplification circuit, 17A...Audio detection circuit, 18...4.5MHz bandpass filter,
19... Limiter amplifier, 20... FM detection circuit, 21... 4.5MHz level detection circuit.
Claims (1)
像中間周波増幅回路と、その増幅出力を検波し映
像信号を出力する映像検波回路と、この映像検波
出力に基づいて前記映像中間周波増幅回路を制御
する利得制御回路とから成る映像回路と、 前記映像中間周波信号から取り出した音声搬送
波信号を利得制御可能に増幅する音声中間周波増
幅回路と、その増幅出力と前記映像検波回路から
得た映像搬送波信号とを掛算検波し音声インター
キヤリア信号を得る音声検波回路と、この音声検
波出力より前記音声インターキヤリア信号を抽出
する帯域通過回路と、この回路で抽出した信号を
振幅制限するリミツタ回路と、このリミツタ回路
を通過した信号をＦＭ検波して音声信号を出力す
るＦＭ検波回路と、前記帯域通過回路にて抽出し
た信号のレベルを検波するレベル検波回路と、こ
のレベル検波出力に基づいて前記音声中間周波増
幅回路を制御する利得制御回路とから成る音声回
路とを具備したことを特徴とするテレビジヨン受
像機の音声検波装置。[Claims for Utility Model Registration] A video intermediate frequency amplification circuit that amplifies a video intermediate frequency signal in a gain controllable manner, a video detection circuit that detects the amplified output thereof and outputs a video signal, and a video circuit comprising a gain control circuit that controls the video intermediate frequency amplification circuit; an audio intermediate frequency amplification circuit that amplifies the audio carrier signal extracted from the video intermediate frequency signal in a gain controllable manner; and an amplified output thereof and the video detection circuit. An audio detection circuit that performs multiplication detection with the video carrier signal obtained from the circuit to obtain an audio intercarrier signal, a bandpass circuit that extracts the audio intercarrier signal from the audio detection output, and an amplitude limiter for the signal extracted by this circuit. an FM detection circuit that performs FM detection on the signal that has passed through the limiter circuit and outputs an audio signal, a level detection circuit that detects the level of the signal extracted by the bandpass circuit, and a level detection output of the level detection circuit. 1. An audio detection device for a television receiver, comprising: an audio circuit comprising a gain control circuit that controls the audio intermediate frequency amplification circuit based on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14580586U JPS6352356U (en) | 1986-09-25 | 1986-09-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14580586U JPS6352356U (en) | 1986-09-25 | 1986-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6352356U true JPS6352356U (en) | 1988-04-08 |
Family
ID=31057677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14580586U Pending JPS6352356U (en) | 1986-09-25 | 1986-09-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6352356U (en) |
-
1986
- 1986-09-25 JP JP14580586U patent/JPS6352356U/ja active Pending
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