Radio receiver

Details Radio receiver Radio receiver

1975-09-08

1976-10-19

Safourek, Benedict V.

Oscillators

Relaxation oscillators

331 19, 325422, H04B 126

Patent

active

039873994

ABSTRACT:
A radio receiver using an oscillator to generate a desired frequency at equal intervals as a local oscillator is disclosed. The radio receiver includes a time constant circuit initiated by turning on the receiver power supply. A pulse signal generator is controlled by the time constant circuit and generates a pulse after a desired time. This pulse is applied to the local oscillator to vary temporarily its oscillating frequency, thereby enabling the oscillating frequency of the local oscillator to be pulled into a frequency corresponding to a desired broadcasting station. A control voltage generator responsive to the IF amplifier and detector of the receiver operates to block the output of the pulse signal generator when it is detected that the frequency of the local oscillator has pulled into the frequency corresponding to the desired broadcasting station. A muting circuit is responsive to the pulse signal generator to prevent an output from the receiver until the frequency of the local oscillator has pulled into the frequency corresponding to the desired broadcasting station.

REFERENCES:
patent: 3806817 (1974-04-01), Uchida
patent: 3869674 (1975-03-01), Borbely
patent: 3889193 (1975-06-01), Sasaki et al.

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