Channel selecting apparatus with reversible counter

Details Channel selecting apparatus with reversible counter Channel selecting apparatus with reversible counter

H - Electricity

04

B

365/4

H04B 1/16 (2006.01) H03J 5/02 (2006.01) H03J 7/28 (2006.01)

Patent

CA 1074929

CHANNEL SELECTING APPARATUS WITH REVERSIBLE COUNTER ABSTRACT OF THE DISCLOSURE A tuning system for a digitally controlled electronic- ally tuned tuner with automatic fine tuning (AFT) constantly operable to hold the tuner at a predetermined optimum fre- quency setting, especially a television channel. A reversible counter provides the digital signal to control the tuning or the tuner and is, itself, deliberately shifted from one setting to another by pulses from a source, such pulses being applied to the UP input terminal or the counter as up-tuning pulses to shift the tuner frequency higher. Pulses from the same source a-e also used as down-tuning pulses when applied to the DOWN input terminal of the counter. A frequency divider divides the frequency of the tuning pulses to a lower frequency sup- plied to two AFT AND circuits. One output logic up-tuning instruction signal EU of the AFT circuit enables the up-tuning AFT AND circuit only in a certain sub-range below the desired frequency. The other output logic down-tuning instruction signal ED of the AFT circuit enables the other AFT AND cir- cuit only in a certain cub-range above the desired frequency. Consequently, deliberate application of up-or-down-tuning pulses to the UP or DOWN terminals changes the count as desired, being only partially counteracted by the lower frequency, AFT- controlled pulses to the opposite counter terminal.

268583

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