Facsimile signal modulation detector

Details Facsimile signal modulation detector Facsimile signal modulation detector

1988-01-22

1989-09-05

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 94, 358443, 329341, 329347, H03K 900

Patent

active

048645915

ABSTRACT:
Electronic apparatus for receiving amplitude or frequency modulated facsimile signals detects the instantaneous value ( i.e., the amplitude or frequency) of the modulation by a circuit including means detecting the modulation value in each cycle of the signal and producing a gating signal corresponding in duration to the detected modulation value, a generator of clock pulses higher in frequency than the signal, and a modulator responsive to the clock pulse and gating signal to pass a number of clock pulses commensurate with the modulation value to a counter which generates a marking signal commensurate in amplitude to the modulation value for application to a facsimile recorder.

REFERENCES:
patent: 3489853 (1970-01-01), Lang
patent: 3600680 (1971-08-01), Maniere et al.
patent: 3828263 (1974-08-01), Blomenkamp

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