Television sound detection system using a frequency...

Details Television sound detection system using a frequency... Television sound detection system using a frequency...

H - Electricity

04

N

350/97

H04N 5/60 (2006.01)

Patent

CA 1212464

ABSTRACT A frequency translation phase-locked loop (PLL) is provided for detecting the audio information from a television signal. A voltage controllable oscillator (VCO) having a nominal oscillation frequency equal to the frequency difference between the intermediate frequency (IF) picture and sound carriers provides one input to a mixer and a substantially unmodulated picture carrier is supplied as the other input to the mixer. A phase detector has as its first input the output signal from the mixer and as its second input the sound carrier. A lowpass filter coupled between the output of the phase detector and a control input to the VCO completes the PLL. The detected audio information is provided at the output of the lowpass filter. Furthermore, the PLL can provide a defect control signal which, when applied to compensation circuitry, reduces impulse noise effects in the video information.

435567

Affiliated with

Also associated with

Rating

Television sound detection system using a frequency... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Television sound detection system using a frequency..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television sound detection system using a frequency... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1309521