NON-CONTROL FREQUENCY DEMODULATOR

摘要

PURPOSE: A non-control frequency demodulator is provided to integrate in one chip by using a pulse density modulation signal generator. CONSTITUTION: A non-control frequency demodulator includes a pulse density modulation signal generator(52) and a low pass filter(54). The pulse density modulation signal generator(52) receives a frequency modulated message signal through an external communication channel and pulse-density-modulates it to have different pulse density corresponding to a frequency of the message signal, and outputs a pulse-density-modulated signal. The low pass filter(54) low pass filters the pulse-density-modulated signal from pulse density modulation signal generator(52) and passes a direct current component included in the pulse-density-modulated signal to thereby recover the original message signal.