System for recording and reproducing multiplex information

Details System for recording and reproducing multiplex information System for recording and reproducing multiplex information

1983-10-28

1986-12-16

Faber, Alan

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 191, 358143, 381 3, 370122, H04N 576

Patent

active

046301348

ABSTRACT:
A method for recording and reproducing multiplex information in which two subcarriers of the same frequency are modulated by two respective subchannel signals. The modulated signals are added to two main channel signals to produce two corresponding sum signals. Two main carriers of different frequencies are then modulated with the two sum signals. Information is recorded on a storage medium in response to the frequency-modulated signals. For reproduction of the recorded information, the main carriers are extracted and separated in frequency, and then detected by separate frequency detecting means. A selected one of two detected outputs from the frequency detecting means is supplied at a time to a common subchannel demodulating means.

REFERENCES:
patent: 3934263 (1976-01-01), Palmer
patent: 4208671 (1980-06-01), Ozawa
patent: 4353090 (1982-10-01), Broadbent
patent: 4353098 (1982-10-01), Heinz
patent: 4472830 (1984-09-01), Nagai
patent: 4490751 (1984-12-01), Kono

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