Digital FM demodulating apparatus

Details Digital FM demodulating apparatus Digital FM demodulating apparatus

1988-12-06

1989-10-17

LaRoche, Eugene R.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329343, 358 23, H03D 300

Patent

active

048750174

ABSTRACT:
In a digital FM demodulating apparatus of this invention, an input video signal is converted into a predetermined digital FM signal, e.g., Asin.theta. by a recording signal processor and supplied from an input terminal to a phase shift circuit. The phase shift circuit divides digital FM signal Asin.theta. into digital FM signals Asin.theta..sub.2 and Acos.theta..sub.2 phase-shifted from each other through 90.degree. and outputs the signals directly to an operational circuit. The digital FM signal Asin.theta. is converted into digital FM signals A'sin.theta..sub.1 and A'cos.theta..sub.1 delayed from signals Asin.theta..sub.2 and Acos.theta..sub.2 by predetermined periods by registers and supplied to the operational circuit. The operational circuit calculates signals Asin.theta..sub.2, Acos.theta..sub.2, A'sin.theta..sub.1 and A'cos.theta..sub.1. A result of tan.sup.-1 conversion of an output from the calculator performed by a ROM having a tan.sup.-1 conversion table is obtained as a value obtained by differentiating a phase component of signal Asin.theta. by a time from an output terminal.

REFERENCES:
IEEE International Conference on Consumer Electronics 1986 Jun. THPM14. 1 "Experiments on VTR Digital Processing".

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