Channel selection apparatus having automatic frequency compensat

Details Channel selection apparatus having automatic frequency compensat Channel selection apparatus having automatic frequency compensat

1987-12-23

1989-03-28

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455260, 3581951, H04B 110, H04B 116

Patent

active

048171956

ABSTRACT:
A channel selection apparatus having a double superhet tuner section (15) for converting one of a plurality of television channels contained in an input signal to a fixedly predetermined channel, includes an AFC circuit (11) for producing a frequency control voltage to execute closed-loop frequency control of the second local oscillator (5) of the tuner section while an AFC switch (16) is set in a first condition, whereas when the AFC switch is set in a second condition, a fixed frequency control voltage is applied to the second local oscillator and the frequency control voltage is applied to adjust the oscillation frequency of the first local oscillator (2) of the tuner section such as to compensate for any offset in the transmission frequency of a currently selected channel.

REFERENCES:
patent: 4365349 (1982-12-01), Ogita et al.
patent: 4556988 (1985-12-01), Yoshisato
patent: 4575761 (1986-03-01), Carlson et al.
patent: 4581643 (1986-04-01), Carlson
patent: 4627100 (1986-12-01), Takano
patent: 4703520 (1987-10-01), Rozanski, Jr. et al.
patent: 4727591 (1988-02-01), Manlove
patent: 4731871 (1988-03-01), Ishikawa
patent: 4731874 (1988-03-01), Ichikawa

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