Detecting circuit

Details Detecting circuit Detecting circuit

1983-02-23

1985-10-29

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 27, 358 28, H04N 946

Patent

active

045503389

ABSTRACT:
A detecting circuit comprises a synchronous detecting circuit (11, 12, 15 to 19, 22 and 27 to 29) and a switching transistor (35). The collector and the emitter of the transistor (35) are connected to junctions (A) and (B), respectively, of the synchronous detecting circuit. The input portion (11) of the synchronous detecting circuit is connected to receive a signal to be detected and the input portion (12) of the same is connected to receive a carrier wave. The base of the transistor (35) is connected to receive a switching signal. The synchronous detecting circuit performs a detecting operation when the switching signal assumes the low level; however, the transistor (35) is turned on when the switching signal assumes the high level so that the junctions (A) and (B) are short-circuited, whereby the synchronous detecting circuit does not perform a detecting operation. Accordingly, the detecting circuit can be switched with a simple circuit configuration. A large change in the direct current potential at the junction (A) occurs when the transistor (35) is turned on and off. Accordingly, a sample and hold circuit (40) can also be simplified.

REFERENCES:
patent: 3626089 (1971-12-01), Cecchin
patent: 3651418 (1972-03-01), Wittmann
patent: 3711634 (1973-01-01), Portoulas
patent: 3740456 (1973-06-01), Harwood

Affiliated with

Also associated with

Rating

Detecting circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Detecting circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detecting circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-730773