A new FM demodulation technique has been developed introducing an idea of feedback controlled variable center-frequency filter. The circuit consists of a variable frequency band pass filter, a Hilbert filter, a phase comparator, a loop filter, and a loop amplifier. It features a wide dynamic range; a high S/N ratio; and a less spurious response. This is an excellent high fidelity FM detector for the CD-4 disc system in particular.

Authors: Ishigaki, Yukinobu; Muraoka, Teruo; Sasamura, Kohei
Affiliation: Victor Company of Japan, Limited, Yokohama, Japan
AES Convention: 57 (May 1977) Paper Number: 1256
Publication Date: May 1, 1977

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