System and method for demodulating the second audio FM carrier

European Patent Office Patent

APP PUB NO EP-1339231-A2
SERIAL NO

03004147

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The present invention provides a system and methodfor SAP FM demodulation. The system includes a bandpass filter (120) for isolating theSAP signal, a Hilbert filter (140) to produce a copy of the SAP signal phase shifted by 90degrees, an FM demodulator (150) for demodulating the SAP signal using the phase shiftedSAP signal (Xq) and a delayed SAP signal (Xi), and a lowpass filter (160) to eliminate noise from theFM demodulated SAP signal. The system may also include an automatic gain controlfor normalizing amplitude of FM demodulator input signals. The digital FMdemodulator uses a simplified approximation using non-unity delay for simplifieddemodulation of frequency modulated signals.

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