Encoding and decoding system

Details Encoding and decoding system Encoding and decoding system

1978-11-13

1980-08-05

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 455 29, H04N 716, H04K 102

Patent

active

042165008

ABSTRACT:
The frequencies of a channel containing at least one modulated carrier are encoded by heterodyning them with an alternating current wave having a cyclically varying frequency, and decoding of the encoded channel is achieved by deriving a signal corresponding to the cyclic variation in the frequencies of an encoded channel and heterodyning the encoded channel with an alternating current wave having a frequency that is varied in accordance with the signal.

REFERENCES:
patent: 3991371 (1976-11-01), Shelby
patent: 4024575 (1977-05-01), Harney et al.
patent: 4034402 (1977-07-01), Brian
patent: 4081831 (1978-03-01), Tang
patent: 4091413 (1978-05-01), Herman

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