Electronic tuning system for radio receivers, with digital memor

Details Electronic tuning system for radio receivers, with digital memor Electronic tuning system for radio receivers, with digital memor

1977-02-24

1978-10-10

Griffin, Robert L.

Tuners

Tuner unit with electromagnetic operator

Predetermined center frequency selector

325464, 334 18, H04B 106

Patent

active

041199154

ABSTRACT:
An electronic tuning system for radio receivers, with digital memorization of the signal frequencies. A manual control generates a first control voltage. A clock pulse generator applies pulses to a counter, the output of which is connected to a digital-to-analog converter to supply a second control voltage, indicative of the number of clock pulses counted by the counter, to electronic tuning circuitry of an electronically tuned radio receiver. A voltage comparator receives the digital-to-analog converter output and the output from the manual control. The output of the voltage comparator is applied to a gate circuit which controls application of the clock pulse signals to the counter so that these signals are discontinued when the output signal from the digital-to-analog converter is substantially equal to the output from the manual control. A digital memory couples the counter output to the input of the digital-to-analog converter and is arranged to digitally store clock pulse count signals corresponding to control frequencies associated with tuning frequencies of selected radio broadcasting stations.

REFERENCES:
patent: 3737787 (1973-06-01), Wolfram
patent: 3818353 (1974-06-01), Sakamoto
patent: 3822405 (1974-07-01), Sakamoto
patent: 3845393 (1974-10-01), Basset
patent: 3943449 (1976-03-01), Hendrickson et al.
patent: 3965336 (1976-06-01), Grohmann
patent: 3978411 (1976-08-01), Sakamoto
patent: 3999131 (1976-12-01), Fukuda
patent: 4031491 (1977-06-01), Sakamoto

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