Digital filter for a digital demodulation receiver

Details Digital filter for a digital demodulation receiver Digital filter for a digital demodulation receiver

1975-11-20

1977-06-07

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

325 30, 325320, H04B 116

Patent

active

RE0292575

ABSTRACT:
A digital filter comprising an up-down counter conditioned by a signal indicative of whether an input periodic oscillation signal is of a frequency representing a binary 1 or a binary 0, to count in one direction to a threshold count for an input 1, and to count in the other direction to a threshold count for an input 0 is disclosed. Additional, a crystal controlled oscillator provides the pulses by which the up-down counter counts in a direction determined by the conditioning signal. The conditioning signal is provided by a storage flip-flop which is conditioned by an indicia signal flip-flop from the demodulation receiver.

REFERENCES:
patent: 3656064 (1972-04-01), Giles
patent: 3660771 (1972-05-01), Balugini et al.
patent: 3674935 (1972-07-01), Lawrence
patent: 3719779 (1973-03-01), Wilson

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