Amplitude modulating system |
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| 申请号 | JP12563379 | 申请日 | 1979-09-29 | 公开(公告)号 | JPS5650603A | 公开(公告)日 | 1981-05-07 |
| 申请人 | Anritsu Corp; | 发明人 | OOOKA TAKAO; ORII EIJI; | ||||
| 摘要 | PURPOSE:To obtain the amplitude modulation wave having a reduced distortion in the amplitude modulating system in which a modulation is applied to the input carrier wave by the feedback modulation system, by reducing the limitation given to the maximum modulation frequency with the minimum value of the input carrier wave. CONSTITUTION:The input carrier signal is converted by the frequency-voltage converter 31 into the voltage which is proportional to the frequency of the carrier wave. This voltage is then compared with the reference voltage of the comparator 30 to produce the signal corresponding to the frequency range of the carrier wave. With this signal, a switching setting is given to the cut-off frequency of the HPF23 and the time constant of the wave detector 26 and the loop filter 29 respectively. As a result, a reduction can be prevented for the maximum modulation frequency due to the minimum value of the input carrier frequency of the device and against an optional input carrier. Thus an amplitude modulation wave can be obtained with a reduced distortion. | ||||||
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| 说明书全文 | |||||||
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