SIGNAL PROCESSING CIRCUIT FOR FM RADIO RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a signal processing circuit for an FM radio receiver that reduces the sampling frequency in its analog/digital conversion. SOLUTION: An integrator 16 detects the level of the output of an amplifier 14. The output of the integrator 16 controls the gain of the amplifier 14 so tat the output of the amplifier 14 is a sine wave output. Thus, a DSP 20 can accurately conduct demodulation by decreasing the sampling gain of an analog/ digital converter 18.