Patent
1976-12-15
1978-02-28
Griffin, Robert L.
325419, 325453, 325459, 325464, 325468, H04B 106
Patent
active
040770095
ABSTRACT:
A tuning circuit for high frequency receivers including a superheterodyne oscillator whose frequency can be varied by a tuning voltage to tune in desired stations and a comparison circuit which produces the tuning voltage by comparing a first number representing the broadcast frequency to which the oscillator is tuned, produced by a counting device which periodically counts the oscillations of the superheterodyne oscillator under consideration of the intermediate frequency with a second number representing the desired received frequency fed in via an input keyboard with series-connected coder and the comparison circuit includes a single comparator suitable only for the comparison of but a single digit of the two numbers at one time and receives the digits of the two numbers to be compared in multiplex operation in succession beginning with the digit assigned the highest value. The counting result from the counting device is displayed on an optical display device controlled in the same multiplex operation as the comparator with the multiplex phase signals required for the multiplex operation of the comparison circuit being obtained from a regenerating circuit which is controlled by at least one synchronizing signal from the counting device and by at least one clock pulse signal appearing per multiplex signal of the display device, so that the resulting multiplex signals for the comparator occur synchronously or in synchronous rhythm with the multiplex signals for the display device. The clock pulse signal is obtained from a control circuit which is connected to the counting device and which circuit together with the regenerating circuit controls the sequence of the entire comparison circuit. Preferably the entire comparison circuit, including the control and regenerating circuit and the comparator is designed to be a single integrated circuit unit.
REFERENCES:
patent: 3961266 (1976-06-01), Tanaka
patent: 3973205 (1976-08-01), Tanaka
patent: 3988681 (1976-10-01), Schurmann
patent: 4005369 (1977-01-01), Parisoe
Klank Otto
Rottmann Dieter
Griffin Robert L.
LICENTIA Patent-Verwaltungs-G.m.b.H.
Ng Jin F.
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