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US 4,061,980 AGranted
Radio receiver with plural converters and frequency control
AssigneeSony Corporation
InventorTsutomu Sato
Life of this patent
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Abstract
A radio receiver including first and second frequency converters to produce first and second intermediate frequency signals, a local oscillator generating a first local signal to be supplied to the second frequency converter, a variable frequency oscillator, and a circuit arrangement to produce a second local signal to be supplied to the first frequency converter based upon the first local signal and an output signal of the variable frequency oscillator. The radio receiver also includes a display means to display a received broadcasting wave.
Claims3
A radio receiver comprising:
- a. first and second frequency converters for producing first and second intermediate frequency signals;
- b. a first oscillator for generating a first local signal to be supplied to said second frequency converter;
- c. a variable frequency oscillator,
- d. a first mixer for producing a beat signal between said first local signal and an output signal generated by said variable frequency oscillator;
- e. a variable frequency divider for producing a signal having a predetermined frequency based on said beat signal;
- f. a second oscillator for generating a reference signal having the frequency same as that of the signal produced by said variable frequency divider;
- g. a comparison circuit for comparing the phase of said reference signal with that of said signal produced by said variable frequency divider and for producing a control signal;
- h. a voltage controlled oscillator for generating a second local signal to be supplied to said first frequency converter in response to said control signal;
- and
- i. a second mixer which is supplied with the second local signal and beat signal and produces a beat signal between both the signals, said last beat signal produced by said second mixer being supplied to said variable frequency divider.
7 more elements
Dependencies are inferred from the claim text.