Keying signal generator with input control for false output immu

Details Keying signal generator with input control for false output immu Keying signal generator with input control for false output immu

1980-08-29

1982-02-16

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 20, 358178, 358172, H04N 544, H04N 946

Patent

active

043162142

ABSTRACT:
A source of keying signals for use by keyed circuits in a television receiver comprises a keyed transistor, an input coupling circuit including a timing control circuit responsive to video sync signals for timing the operation of the keyed transistor to normally produce keying signals during blanking intervals of the television signal, and a switching network coupled to the input circuit. The switching network responds to switching signals for enabling the sync signals to be coupled to the keyed transistor via the input coupling circuit during the blanking intervals. During picture intervals of the television signal, the switching network disables the input coupling circuit to prevent the transistor from generating false keying signals in response to spurious input signals occurring during the picture intervals. In addition, the timing control circuit and transistor are isolated from the switching signal during picture intervals so that the switching signal does not upset the normally expected input timing bias of the transistor during picture intervals.

REFERENCES:
patent: 3268656 (1966-08-01), Hansen
patent: 4213151 (1980-07-01), Harford
patent: 4263610 (1981-04-01), Shanley et al.

Affiliated with

Also associated with

Rating

Keying signal generator with input control for false output immu does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Keying signal generator with input control for false output immu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Keying signal generator with input control for false output immu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-944931