Camera including demodulating processing circuit with time inter

Details Camera including demodulating processing circuit with time inter Camera including demodulating processing circuit with time inter

1993-11-12

1995-05-16

Perkey, W. B.

G03B 1724

Patent

active

054165466

ABSTRACT:
In a demodulation circuit for demodulating a pulse position modulation (PPM) signal, and a camera having the demodulation circuit, a change in PPM signal is counted by an up/down counter which is switched between count-up and count-down modes every time the PPM signal changes. When a carry signal is output from the counter, the carry signal is latched, and the PPM signal is demodulated into binary data on the basis of the presence/absence of the carry signal in the count-up mode and the carry signal in the count-down mode.

REFERENCES:
patent: 4964139 (1990-10-01), Wash et al.
patent: 5184161 (1993-02-01), Egawa
patent: 5220367 (1993-06-01), Matsuyama
patent: 5229810 (1993-07-01), Cloutier et al.
patent: 5270875 (1993-12-01), Shah et al.
patent: 5281987 (1994-01-01), Nagata

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