Demodulation clock generator circuit

Details Demodulation clock generator circuit Demodulation clock generator circuit

1989-01-19

1989-11-21

LaRoche, Eugene R.

Demodulators

Phase shift keying or quadrature amplitude demodulator

Including logic element

375 87, H03D 300

Patent

active

048825468

ABSTRACT:
A demodulation clock generator circuit employed in a modulation system such as a bi-phase mark system is improved by including a frequency detector to speed up the initial processing of a data signal to be demodulated. The frequency detector generates a frequency detection signal which corresponds to a signal from an oscillator and a signal from a synchronization signal portion of the signal to be demodulated. The frequency detector includes a memory portion clocked by the oscillator for storing the states of the signal to be demodulated and a signal generating portion for supplying the frequency detection signal when information stored in the memory portion is the same as a synchronizing portion of the signal to be demodulated and has a frequency of less than a predetermined value.

REFERENCES:
patent: 3878334 (1975-04-01), Halpern
patent: 4339725 (1982-07-01), Ichiyoshi

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