Modulating/demodulating circuit for multiplex recording/playback

Details Modulating/demodulating circuit for multiplex recording/playback Modulating/demodulating circuit for multiplex recording/playback

1988-09-28

1990-03-06

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358909, 360 29, 360 18, 329311, 329358, H04N 576

Patent

active

049070924

ABSTRACT:
A data signal is modulated by an exclusive-OR operation applied to a carrier signal and a data signal to be recorded. Demodulation is similarly performed by an exclusive-OR operation applied to the carrier signal and signal indicative of read data. This makes it possible to construct the modulating/demodulating circuit in the form of a digital circuit.

REFERENCES:
patent: 4628271 (1986-12-01), Takayama

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