JPS5825630Y2 - television receiver - Google Patents
television receiverInfo
- Publication number
- JPS5825630Y2 JPS5825630Y2 JP681076U JP681076U JPS5825630Y2 JP S5825630 Y2 JPS5825630 Y2 JP S5825630Y2 JP 681076 U JP681076 U JP 681076U JP 681076 U JP681076 U JP 681076U JP S5825630 Y2 JPS5825630 Y2 JP S5825630Y2
- Authority
- JP
- Japan
- Prior art keywords
- audio
- circuit
- video
- carrier wave
- 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.)
- Expired
Links
Landscapes
- Television Receiver Circuits (AREA)
Description
【考案の詳細な説明】
本考案は、テレビジョン受像機の音声回路の改良に係る
ものである。[Detailed Description of the Invention] The present invention relates to an improvement of the audio circuit of a television receiver.
テレビジョンの放送方式は各国さまざまな方式が採用さ
れており、この中で特に大きく異なる方式として音声搬
送波の変調方式がＡＭ方式に分かれていることがあげら
れる。A variety of television broadcasting systems are used in each country, and one of the most significantly different systems is the AM system in which the audio carrier wave is modulated.
音声ＡＭ方式は映像変調方式もＡＭでＡＭ−ＡＭ方式と
なり、一般に使用される回路は第１図に示す如くチュー
ナの出力端子１よりの出力信号を音声トラップ回路２及
び音声搬送波検出回路３に供給し、音声トラップ回路２
より映像増幅回路４、映像検波回路５を介して映像検波
出力を導出し、音声搬送波検出回路３より音声増幅回路
６、音声ＡＭ検波回路７を介して音声検波出力を導出し
て構成され、この場合音声トラップ回路２において充分
音声搬送波を減衰させ映像検波出力への音声信号の混入
を防止し、音声搬送波検出回路３にて音声搬送波のみを
ピックアップし音声回路への映像搬送波の混入を防止し
ている。The audio AM system is an AM-AM system in which the video modulation system is also AM, and the commonly used circuit supplies the output signal from the output terminal 1 of the tuner to the audio trap circuit 2 and the audio carrier detection circuit 3, as shown in FIG. and voice trap circuit 2
The video detection output is derived from the video amplification circuit 4 and the video detection circuit 5, and the audio detection output is derived from the audio carrier detection circuit 3 via the audio amplification circuit 6 and the audio AM detection circuit 7. In this case, the audio trap circuit 2 sufficiently attenuates the audio carrier wave to prevent the audio signal from being mixed into the video detection output, and the audio carrier detection circuit 3 picks up only the audio carrier wave to prevent the video carrier wave from mixing into the audio circuit. There is.
又、音声ＦＭ方式は映像変調方式がＡＭ″［′ＦＭＡＭ
方式となり使用される回路としては第２図の如く、チュ
ーナの出力端子１１よりの出力信号を映像増幅回路１２
に供給し、該映像増幅回路１２より映像検波回路１３を
介して映像検波出力を導出すると共に、インターキャリ
ア方式による音声中間周波数を検波する検波回路１４、
音声増幅及びリミッタ−回路１５、音声ＦＭ検波回路１
６を介して音声検波出力を導出して構成され、この場合
は音声搬送波が映像検波回路１３に供給されるが、音声
搬送波がＦＭ戊分であるため映像搬送波と音声搬送との
周波数差の中間周波成分が現われ音声中間周波数として
導出する。In addition, the video modulation method for the audio FM method is AM''['FMAM
As shown in Fig. 2, the circuit used for this system is to convert the output signal from the output terminal 11 of the tuner into a video amplification circuit 12.
a detection circuit 14 which supplies a video detection output from the video amplification circuit 12 via a video detection circuit 13 and detects an audio intermediate frequency using an intercarrier method;
Audio amplification and limiter circuit 15, audio FM detection circuit 1
In this case, the audio carrier wave is supplied to the video detection circuit 13, but since the audio carrier wave is an FM component, the frequency difference between the video carrier wave and the audio carrier is the middle of the frequency difference between the video carrier wave and the audio carrier wave. A frequency component appears and is derived as an audio intermediate frequency.
この音声中間周波数の実用レベルを維持するため映像増
幅回路１２にトラップを設は規定値に設定している。In order to maintain this audio intermediate frequency at a practical level, a trap is installed in the video amplification circuit 12 and set to a specified value.
この様は回路方式において、第１図のＡＭ−ＡＭ方式の
回路によれば音声トラップ回路２及び映像増幅回路４に
音声搬送波が存在せず、音声搬送波検出回路３及び音声
増幅回路６に映像搬送波が存在しない為、映像検波回路
５及び音声ＡＭ検波回路７のいずれにもインターキャリ
ア方式による音声中間周波数が存在せず音声ＦＭ方式に
は使用できない。In the circuit system, in the case of the AM-AM circuit shown in FIG. Therefore, neither the video detection circuit 5 nor the audio AM detection circuit 7 has an audio intermediate frequency based on the intercarrier method, and cannot be used for the audio FM method.
又、第２図のＦＭ−ＡＭ方式の回路に音声ＡＭ方式を適
用すれば、映像検波回路１３より導出される映像検波出
力に音声検波出力が混入し、画像に悪影響を及ぼすため
音声ＡＭ方式には使用できない。Furthermore, if the audio AM method is applied to the FM-AM method circuit shown in FIG. cannot be used.
本考案は、上述したＡＭ方式とＦＭ方式で相反する音声
回路の問題点を解決し、両方式を支障なく受信可能とし
たテレビジョン受像機の回路方式を提供するものであり
、以下第３図に従ってその実施例を説明する。The present invention solves the problems of the conflicting audio circuits between the AM and FM systems mentioned above, and provides a circuit system for a television receiver that can receive both systems without any problems, as shown in Figure 3 below. The embodiment will be explained according to the following.
第３図の回路図は本考案の実施例で、チューナの出力端
子２１より音声トラップ回路２２及び音声搬送波検出回
路２３を接続し、音声トラップ回路２２より映像増幅回
路２４、映像検波回路２５を介して映像検波出力を導出
し、音声搬送波検出回路２３より音声増幅回路２６と音
声検波回路２７を接続し、該音声検波回路２７の出力端
よりリミッタ−回路２８と音声ＦＭ検波回路２９を接続
し、該リミッタ−回路２８及び音声ＦＭ検波回路２９と
並列に第１のスイッチ３０を接続し、該並列接続端より
音声検波出力を導出すると共に、前記音声増幅回路２６
の出力端と映像増幅回路２４の出力端間に第２のスイッ
チ３１を設けて構成する。The circuit diagram in FIG. 3 shows an embodiment of the present invention, in which an audio trap circuit 22 and an audio carrier detection circuit 23 are connected from the output terminal 21 of the tuner, and a video amplification circuit 24 and a video detection circuit 25 are connected from the audio trap circuit 22. to derive the video detection output, connect the audio amplifier circuit 26 and the audio detection circuit 27 from the audio carrier detection circuit 23, connect the limiter circuit 28 and the audio FM detection circuit 29 from the output end of the audio detection circuit 27, A first switch 30 is connected in parallel with the limiter circuit 28 and the audio FM detection circuit 29, and the audio detection output is derived from the parallel connection terminal, and the audio amplification circuit 26
A second switch 31 is provided between the output terminal of the video amplifier circuit 24 and the output terminal of the video amplification circuit 24.
本考案は上記の如く構成するので、音声ＡＭ方式の場合
は第１のスイッチ３０を閉威し第２のスイッチ３１を開
成すれば、音声トラップ回路２２及び映像増幅回路２４
を介して得られる映像搬送波を映像検波回路２５にて検
波し映像検波出力を導出すると共に、音声搬送波検出回
路２３及び音声増幅回路２６を介して得られる音声搬送
波を音声検波回路２７にて検波し、第１のスイッチ３０
を介してＡＭ方式の音声検波出力が導出される。Since the present invention is constructed as described above, in the case of the audio AM system, if the first switch 30 is closed and the second switch 31 is opened, the audio trap circuit 22 and the video amplification circuit 24
The video carrier wave obtained through the audio carrier wave detection circuit 23 and the audio amplification circuit 26 is detected by the video detection circuit 25 to derive a video detection output, and the audio carrier wave obtained through the audio carrier wave detection circuit 23 and the audio amplification circuit 26 is detected by the audio detection circuit 27. , first switch 30
The AM system audio detection output is derived through the .
そして、音声ＦＭ方式の場合は第１のスイッチ３０を開
成し第２のスイッチ３１を閉成すれば、前記同様に映像
検波出力が導出され、更に音声増幅回路２６からの音声
搬送波と第２のスイッチ３１を介して印加される映像搬
送波により音声検波回路２７にてインターキャリア方式
による音声中間周波信号が検波されＦＭ変調されている
ため、リミッタ−回路２８及び音声ＦＭ検波回路２９を
介してＦＭ方式の音声検波出力が導出される。In the case of the audio FM method, by opening the first switch 30 and closing the second switch 31, the video detection output is derived in the same manner as described above, and the audio carrier wave from the audio amplification circuit 26 and the second Since the audio intermediate frequency signal based on the intercarrier method is detected and FM modulated in the audio detection circuit 27 by the video carrier wave applied via the switch 31, the FM method is detected via the limiter circuit 28 and the audio FM detection circuit 29. The audio detection output of is derived.
これにより、音声搬送波の変調方式がＡＭ方式あるいは
ＦＭ方式のいずれかの方式であっても画像等への影響を
及ぼすことなく受信可能となる。As a result, even if the modulation method of the audio carrier wave is either the AM method or the FM method, it is possible to receive the audio without affecting the image or the like.
尚、同期検波方式の映像検波方式回路を採用するものに
おいては、映像増幅回路２４と音声増幅回路２６の各出
力端に映像搬送波を印加すれば、第１及び第２のスイッ
チを不要とすることができる。In addition, in a device that employs a synchronous detection type video detection circuit, if a video carrier wave is applied to each output terminal of the video amplification circuit 24 and the audio amplification circuit 26, the first and second switches can be made unnecessary. I can do it.
第１図は従来の音声ＡＭ方式の回路図、第２図は同音声
ＦＭ方式の回路図、第３図は本考案の回路図、であす、
２４は映像増幅回路、２５は映像検波回路、２６は音声
増幅回路、２７は音声検波回路、２９は音声ＦＭ検波回
路、３０及び３１は第１及び第２のスイッチ、をそれぞ
れ示す。Figure 1 is a circuit diagram of the conventional audio AM system, Figure 2 is a circuit diagram of the same audio FM system, and Figure 3 is a circuit diagram of the present invention.
24 is a video amplification circuit, 25 is a video detection circuit, 26 is an audio amplification circuit, 27 is an audio detection circuit, 29 is an audio FM detection circuit, and 30 and 31 are first and second switches, respectively.
Claims (1)
、映像搬送波を検波するＡＭ検波手段、及び音声搬送波
をＡＭ検波若しくは前記両搬送波を混合し中間周波数信
号をＦＭ検波する切換手段を設けたことを特徴とするテ
レビジョン受像機。AM detection means for separating the output signal of the tuner into a video carrier wave and an audio carrier wave and detecting the video carrier wave, and a switching means for performing AM detection on the audio carrier wave or FM detection on the intermediate frequency signal by mixing the two carrier waves. A distinctive television receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP681076U JPS5825630Y2 (en) | 1976-01-23 | 1976-01-23 | television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP681076U JPS5825630Y2 (en) | 1976-01-23 | 1976-01-23 | television receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5299731U JPS5299731U (en) | 1977-07-28 |
| JPS5825630Y2 true JPS5825630Y2 (en) | 1983-06-02 |
Family
ID=28467369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP681076U Expired JPS5825630Y2 (en) | 1976-01-23 | 1976-01-23 | television receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5825630Y2 (en) |
-
1976
- 1976-01-23 JP JP681076U patent/JPS5825630Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5299731U (en) | 1977-07-28 |
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