Apparatus for and method of improving the AFC of a television br

Details Apparatus for and method of improving the AFC of a television br Apparatus for and method of improving the AFC of a television br

1989-04-25

1991-05-07

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455209, 3581911, H04N 720

Patent

active

050143506

ABSTRACT:
A BS tuner (16a, 16b, 16c, 16d) comprises an AFC down-converter (80, 80a). The down-converter (80, 80a) comprises an oscillator (84, 85) and a mixer (86). The AFC down-converter (80, 80a) mixes a second IF signal with an oscillation signal output from the oscillator (84, 85). Consequently, a third IF signal having a frequency lower than the frequency of the second IF signal is obtained. At the time of receiving a MUSE signal, a counter circuit (46) counts the third IF signal. The frequency of the second IF signal is adjusted based on the result of counting by the counter circuit (46).

REFERENCES:
patent: 4162452 (1979-07-01), Ash
patent: 4403345 (1983-06-01), Granek et al.
patent: 4417279 (1983-11-01), Shinkawa et al.
patent: 4581643 (1986-04-01), Carlson
patent: 4727591 (1988-02-01), Manlove
patent: 4817197 (1989-03-01), Shimizu et al.

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