Tuned signal detector for use with a radio frequency receiver

Details Tuned signal detector for use with a radio frequency receiver Tuned signal detector for use with a radio frequency receiver

1994-12-07

1996-04-23

Groody, James J.

Television

Receiver circuitry

Tuning

348177, 348194, 348605, 348607, 455214, H04N 1700

Patent

active

055108598

ABSTRACT:
Disclosed is a tuned channel detector which includes a cable path between a radio frequency source and a receiver such as a TV, wherein the radio frequency source passes first through an attenuator and second through a signal selection module comprising two opposing directional couplers and a single-pole/double-throw switch. The channel to which the TV is tuned is determined by measuring the TV's local oscillator signal from the cable which feeds the radio frequency signal to the TV and, additionally or alternatively, by comparing the signal strength of the input and reflected TV carrier signals at and around the channels under test. Signal detection is further enhanced by modulating the signal mixed with the local oscillator with a tone and/or testing only during certain intervals such as the vertical synchronization interval or the power line cycle. A tone detector having a synchronous rectifier is used to detect low level local oscillator signals. Tuned channel detection is further enhanced through the use of artificial intelligence techniques.

REFERENCES:
patent: 4074191 (1978-02-01), Jules
patent: 4364094 (1982-12-01), French et al.
patent: 4408227 (1983-10-01), Bradley
patent: 4700222 (1987-10-01), Large et al.
patent: 5161187 (1992-11-01), Kajita et al.
patent: 5319709 (1994-06-01), Raiser et al.

Affiliated with

Also associated with

Rating

Tuned signal detector for use with a radio frequency 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 Tuned signal detector for use with a radio frequency receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tuned signal detector for use with a radio frequency receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2312814