Television – Receiver circuitry – Tuning
Patent
1996-01-19
1998-06-23
Burgess, Glenton B.
Television
Receiver circuitry
Tuning
348732, 348725, 348735, H04N 550
Patent
active
057710805
ABSTRACT:
A television signal tuning device having a memory which is adapted to store central frequency data for starting a synchronizing-signal detecting operation for all the channels and frequency division ratio data thereof. In a data presetting operation for each of the channels, a CPU causes a phase-locked loop circuit to perform a phase-locking operation for every data piece of the central frequency data or frequency division ratio data thereof which are stored in the memory for each channel. When the CPU detects a synchronizing signal from a video signal processing circuit in any one of the phase-locking operations which are successively performed by the phase-locked loop circuit, the CPU immediately renews the channel number and the tuning data thereof in the memory without performing the detection of an AFC variation. This feature greatly reduces the period of time required for the data presetting operation for each channel.
REFERENCES:
patent: 4038689 (1977-07-01), Rzeszewski
patent: 4106059 (1978-08-01), Henderson
patent: 4337486 (1982-06-01), Akutsu
patent: 4360832 (1982-11-01), Rzeszewski
patent: 4451850 (1984-05-01), Kamemoto
patent: 4743968 (1988-05-01), Mogi et al.
patent: 4751574 (1988-06-01), Mogi et al.
patent: 5034819 (1991-07-01), Tsukagoshi
patent: 5107335 (1992-04-01), Nishiyama et al.
Burgess Glenton B.
Funai Electric Co. Ltd.
LandOfFree
Television signal tuning device 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 signal tuning device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Television signal tuning device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1398180