Didon digital demodulator

Details Didon digital demodulator Didon digital demodulator

1985-03-05

1987-01-13

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

329104, 375 94, H04N 7093, H03K 900

Patent

active

046368590

ABSTRACT:
A DIDON Digital demodulator includes an input analog-to-digital conversion device which supplies n samples (n being at least equal to 4) during a DIDON period, and an identification device which involves shifts at the sampling frequency in order to search and detect groups of n successive samples which are probably representative of DIDON signals. The probability criteria are a function of the structure of the group under study and of the nature of the DIDON signal which said group may represent in comparison with the nature of the DIDON signal represented by the group which precedes this signal by a DIDON period. The identification device outputs a configuration probability signal and a configuration signal. The configuration signal is received by a data regenerating circuit which then regenerates a data signal and a clock signal when the identification device determines that the configurations are probably DIDON signals.

REFERENCES:
patent: 4034404 (1977-07-01), Nakagome et al.
patent: 4199656 (1980-04-01), Saylor
patent: 4242755 (1980-12-01), Gauzan
patent: 4302845 (1981-11-01), McClaughry et al.
patent: 4303941 (1981-12-01), Marti et al.
patent: 4358846 (1982-11-01), Morgan
Funkschau, vol. 49, No. 19, pp. 62-67, 9/1977.
Proceedings of the IEE, vol. 126, No. 12, 12/1979, pp. 1374-1396.

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