Tuning system with provisions for calculating the local oscillat

Details Tuning system with provisions for calculating the local oscillat Tuning system with provisions for calculating the local oscillat

1988-05-09

1989-09-19

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455183, 455192, 455196, 3581931, 3581951, H04B 116, H04N 550

Patent

active

048688924

ABSTRACT:
A television tuning system includes control apparatus for changing the frequency of a local oscillator signal during a search and a comparator arrangement for determining when an AFT signal traverses first and second threshold values corresponding to first and second frequencies in respective "hump" regions of the AFT signal. The frequency of the local oscillator is set to the average of the first and second frequencies in order to set the frequency of the IF picture carrier closer to the nominal value than the first and second frequencies.

REFERENCES:
patent: 4302778 (1981-11-01), Tanaka
patent: 4408349 (1983-10-01), Yukawa
patent: 4422096 (1983-12-01), Henderson
patent: 4426734 (1984-01-01), Tults et al.
patent: 4438528 (1984-03-01), Itagaki
patent: 4439787 (1984-03-01), Mogi et al.
patent: 4442413 (1984-04-01), Hayashida et al.
patent: 4498191 (1985-02-01), Rogers
patent: 4689685 (1987-08-01), Testin et al.
patent: 4709406 (1987-11-01), Omoto
patent: 4763195 (1988-08-01), Tults
"Schematic Sony KV-25XBR Tuning System", May 1986.

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