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Application of Walsh Functions to an FM Stereo Demodulator

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In the conventional FM stereo demodulator, interference from adjacent channels is demodulated by the harmonics of a square wave switching signal resulting in a high pitched whistle type noise. In our new demodulator, such noise is not generated because the switching square waves are derived from Walsh functions. We can therefore eliminate the low-pass filter, producing a phase-linear composite signal characteristic with high separation and low distortion.

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AES - Audio Engineering Society