| 摘要 |
A circuit for controlling the amplitude of the pilot signal which is received together with the modulated wave to a constant, mixing the signal with the modulated wave, and offsetting the random FM noises included in the modulated wave with the random FM noises included in the pilot signal. In this circuit, the frequency to be received is extracted from the input signal in a high frequency band. This output is converted by a frequency converter into a signal in a low frequency band. Thus extraction of the pilot signal and offset of the random FM noises are executed in a low frequency band. Hence it is possible to relax the characteristics required for the band pass filter in a high frequency band. |
