Electronic digital channel-selecting apparatus

Details Electronic digital channel-selecting apparatus Electronic digital channel-selecting apparatus

1979-02-15

1981-04-14

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455185, 455192, 455259, 455264, H04B 126

Patent

active

042623642

ABSTRACT:
An electronic digital channel-selecting apparatus wherein a digital signal corresponding to a selected television channel is read out of a digital memory to be converted into an analog tuning voltage by a digital-analog converter; and the analog tuning voltage is applied to a voltage-controlled tuner which in turn is made to tune with the selected television channel. An AFT circuit is coupled to the tuner to detect its tuning condition. When the tuner does not accurately tune with the selected television channel, AFT clock pulses are supplied to an AFT counter to correct the analog tuning voltage depending on varying count numbers in the AFT counter. A clock changer is provided to switch AFT clock pulses having different frequencies such that the AFT clock pulses are successively applied to the AFT counter in the decreasing order of their frequencies during the AFT control.

REFERENCES:
patent: 4004231 (1977-01-01), Elshuber et al.
patent: 4079320 (1978-03-01), Mogi
patent: 4127822 (1978-11-01), Mogi et al.
patent: 4152654 (1979-05-01), Tanaka

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