Frequency selection receiver with variable time constant control

Details Frequency selection receiver with variable time constant control Frequency selection receiver with variable time constant control

1977-06-21

1979-02-27

Griffin, Robert L.

Oscillators

Relaxation oscillators

325421, 325452, 331 1A, H04B 106

Patent

active

041421582

ABSTRACT:
A television or radio receiver having electronic means for selecting the frequency to which the receiver is to be tuned, in which the selection is effected by means of a voltage controlled oscillator controlled by a control loop which receives the output signal from the oscillator, divides it by a number derived from a memory which stores a plurality of numbers corresponding to the available frequencies for reception by the receiver, compares the divided signal with a reference frequency to generate an error signal, and feeds the error signal through a low pass filter back to the control input of the amplifier. The time constant of the filter can be changed by short circuiting a resistor of the filter so that the control loop operates with a short time constant when actually selecting a frequency whereas it operates with a longer time constant while maintaining a selected frequency.

REFERENCES:
patent: 3729688 (1973-04-01), Cerny, Jr. et al.
patent: 3980951 (1976-09-01), Breeze et al.
patent: 3993958 (1976-11-01), Cutsogeorge
patent: 4053933 (1977-10-01), Collins

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