frequency-modulation frequency converter
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针对PGC解调中混频信号与实际调制信号的频率偏差，在DSP系统实现中采用一路A/D转换器对调制信号进行同步采样，从而克服了频率偏差对解调结果的影响。
To overcome the frequency offset between the mixing signal and modulating signal in PGC demodulation, an additional (A/D) channel in DSP system is used to sample the modulating signal.
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