Fast tuning control for a television system

Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

455186, 455200, 3581951, H04B 116

Patent

active

047486848

ABSTRACT:
A fast tuning subsystem includes a tuner for selecting a channel, with a voltage controlled oscillator having a control input for determining the channel frequency the tuner selectively receives. A predictor supplies a selected predicted voltage signal from memory to the control input of the oscillator to slew the channel frequency at a rapid slew rate to the frequency corresponding to the selected predicted voltage signal. An error detector generates a tuning error signal indicative of the tuning error of the tuner off the frequency for the selected channel. The tuning error signal is combined with the selected predicted voltage signal to provide a control signal for adjusting the channel frequency to reduce the tuning error. The subsystem also similarly controls the amplitude of the received channel. The tuning subsystem automatically and from time to time changes the signals stored in the memory for respective channels to signals corresponding to the control signals applied after long term feedback. The feedback provides successively a correction mode and a station-keeping mode. The correction mode provides correction of any error in tuning of an acquired channel fast enough that the correction is substantially imperceptible to the eye and any residual error is substantially imperceptible to the eye. The station-keeping mode operates slowly enough to filter out noise and spurious signals and maintain any residual error below a predetermined limit over long periods of time.

REFERENCES:
patent: 4079320 (1978-03-01), Mogi
patent: 4085371 (1978-04-01), Mogi et al.
patent: 4100578 (1978-07-01), Arneson
patent: 4220922 (1980-09-01), Ikeguchi
patent: 4241449 (1980-12-01), Tanaka
patent: 4247952 (1981-01-01), Shibuya
patent: 4298988 (1981-11-01), Dages
patent: 4355414 (1982-10-01), Inoue
patent: 4476584 (1984-10-01), Dages
patent: 4491975 (1985-01-01), Ito
patent: 4525866 (1985-06-01), Templin
patent: 4630118 (1986-12-01), Suzuki

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Fast tuning control for a television system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fast tuning control for a television system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast tuning control for a television system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1879621

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.