Automatic sweep digital tuning circuit

Details Automatic sweep digital tuning circuit Automatic sweep digital tuning circuit

1981-09-04

1983-04-19

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, H04B 126

Patent

active

043808255

ABSTRACT:
An automatic sweep digital tuning circuit includes an up-down counter, a digital-to-analog converter, an electronic tuner, an automatic sweep control circuit and an automatic frequency fine control circuit. The up-down counter performs a count-up or count down operation under the control of the automatic sweep control circuit and the automatic frequency fine control circuit. The digital-to-analog converter converts the digital output of the up-down counter into a DC voltage. The electronic tuner receives the DC voltage and generates a tuning frequency. The automatic frequency fine control circuit finely controls the tuning frequency of the electronic tuner after the automatic frequency sweep by the automatic sweep control circuit has been stopped. A count down circuit forces the up-down counter to perform a count down operation to compensate for a time delay caused by the digital-to-analog conversion.

REFERENCES:
patent: 3936753 (1976-02-01), Clark
patent: 4217552 (1980-08-01), Mogi et al.

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