FM signal magnitude quantizer and demodulator compatible with digital signal processing

摘要: A sampled input signal is quantized to lie within a predetermined magnitude range. The coupled bandpass filter which selects the digital be processed. bandlimited then feedback automatic gain control circuit removes slow variations in envelope of signal. output AGC feedforward fast and feed forward circuits share common detector, that composed squaring operation low pass operation. also reduces dynamic range required circuit. processed demodulated with quadrature FM detector. detector may filtered, D/A converter produce an audio message