High frequency modulation circuit |
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| 申请号 | JP4041384 | 申请日 | 1984-03-05 | 公开(公告)号 | JPS60185475A | 公开(公告)日 | 1985-09-20 |
| 申请人 | Alps Electric Co Ltd; | 发明人 | YAMAGUCHI YOSHITADA; | ||||
| 摘要 | PURPOSE: To cope with a receiver of the different system and to attain economy by providing plural modulation circuits of different system switchingly in a device modulating a reproducing signal from a VTR or the like and applying the result to the receiver so as to reproduce the recorded picture. CONSTITUTION: The plural sound subcarrier modulation circuits OM and G in response to the television system of the receivers in use are provided, and they are switched corresponding to the receiver in use by using the 1st switching transistors Q 1 , Q 4 and Q 7 . Further, a modulation means comprising a block L mixing the modulated sound subcarrier signal and a video signal so as to modulate a carrier from a carrier oscillator COSC is provided and the modulation system of the modulation means is switched in response to the system of the receiver in use by using the 2nd switching means comprising blocks J, K. Thus, the economical constitution is attained in comparison with the case with an exclusive modulation circuit provided at each television system. COPYRIGHT: (C)1985,JPO&Japio |
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