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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 this new demodulator no such noise is generated because the switching square waves are derived from Walsh functions. The low-pass filter can therefore be eliminated, producing a phase-linear composite signal characteristic with high separation and low distortion.

JAES Volume 33 Issue 9 pp. 669-673; September 1985
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AES - Audio Engineering Society