Automatic modulation factor control circuit of transmitter |
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| 申请号 | JP15781077 | 申请日 | 1977-12-29 | 公开(公告)号 | JPS5492005A | 公开(公告)日 | 1979-07-20 |
| 申请人 | Sanyo Electric Co Ltd; | 发明人 | OKADA HISAO; KAWAMOTO YUKIHIRO; | ||||
| 摘要 | PURPOSE: To control with simple circuit and adjust easily by responding to the output of detection circuit 17 by a modulation input voltage control circuit and modulating the modulation output voltage within the specified level, thus controlling the modulation factor. CONSTITUTION: The signal applied to microphone 1 by automatic modulation control AMC circuit 16 is controlled, that is, feedback circuit 13 is installed from the output side to the input side of modulation signal amplifier circuit 5, the peak value of modulation output voltage is detected 17, modulation input voltage control circuit 18 is used for responding to the output of circuit 17 and modulation is made so that the peak value of modulation output voltage is kept lower than the specified level, thus controlling the modulation factor. With this invention, the automatic modulation factor control circuit of transmitter that meets all requirements can be made with a simple and readily adjustable circuit. COPYRIGHT: (C)1979,JPO&Japio |
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