Signal demodulation device

Details Signal demodulation device Signal demodulation device

1991-04-16

1994-02-15

Powell, Mark R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358314, 360 381, 375 94, 375 84, 348643, H04N 988, H04N 594

Patent

active

052871975

ABSTRACT:
A signal demodulation device includes a change point sensing circuit which senses a change point of an envelope of a DPSK signal, and a range setting circuit which generates a gate pulse corresponding to a period in which the DPSK signal cannot be changed. An output signal of the change point sensing circuit and the gate pulse are inputted to an AND gate so that a trigger prohibition signal is obtained. The trigger prohibition signal and the output signal of the change point sensing circuit are inputted to a NOR gate so that a trigger pulse corresponding only to a normal change point of the DPSK signal is generated, so that DPSK modulation data is obtained.

REFERENCES:
patent: 4618830 (1986-10-01), Mori et al.
patent: 4628271 (1986-12-01), Takayama
patent: 4746872 (1988-05-01), Yamagata
patent: 4827357 (1989-05-01), Kawakami
Patent Abstract of Japan, vol. 12, No. 187, May 31, 1988.
Patent Abstract of Japan, vol. 14, No. 239, May 21, 1990.
French Search Report and Annex.
English Language Abstract of JP 62-223855.
United Kingdom Search Report Corresponding to App. No. 9108585.2.

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