Tuning apparatus for the VHF band of a television receiver

Details Tuning apparatus for the VHF band of a television receiver Tuning apparatus for the VHF band of a television receiver

1987-08-21

1988-09-13

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455180, 455191, H04N 5455, H04B 118

Patent

active

047713321

ABSTRACT:
A channel selection circuit selects signals of a desired frequency from television signals. A channel interpretation circuit determines whether or not the signals thus selected are low-band or high-band. When the signals are low-band, a movable contact is coupled to a D.C. power source. When the signals are high-band, the movable contact is coupled to the ground. A first trap circuit traps the intermediate-frequency components of the selected signals. A second trap circuit connected to the first trap circuit, and a third trap circuit coupled between the output of the second trap circuit and the group and also connected to the movable contact of a switch section, cooperate, thereby trapping predetermined signals. More specifically, when the movable contact is coupled to the D.C. power source, a semiconductor switching device is turned on, thus causing the second and third trap circuits to trap high-band signals and intermediate-frequency signals. When the movable contact is coupled to the ground, the switching device is turned off, thereby causing to the second and third trap circuits to perform the image-trapping of high-band signals and to trap low-band signals.

REFERENCES:
patent: 3962643 (1976-06-01), Ma
patent: 4298290 (1981-09-01), Ijichi
patent: 4379269 (1983-04-01), Ijichi
patent: 4612571 (1986-09-01), Moon

Affiliated with

Also associated with

Rating

Tuning apparatus for the VHF band of a television receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tuning apparatus for the VHF band of a television receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tuning apparatus for the VHF band of a television receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-809471