Microcomputer controlled synthesizer-type radio receiver
AssigneeSony Corporation
InventorsKazuyuki Suda, Akio Araki, Toshio Asai
Life of this patent
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Abstract
An electronic apparatus includes at least a receiver having a synthesizer section for selecting a receiving frequency and providing an information signal corresponding to the selected receiving frequency, a microcomputer operating on a clock signal for controlling the synthesizer section, and a circuit responsive to the information signal for shifting the clock frequency when the selected receiving frequency is a frequency disturbed by a higher harmonic of the clock frequency, thereby to avoid disturbance of reception of the broadcast signal without requiring undue reduction of the clock frequency.
Claims7
An electronic apparatus comprising:
- receiver means having a synthesizer section for selecting a receiving frequency within a predetermined frequency band and receiving a signal broadcast at the selected receiving frequency, said receiver means providing an information signal corresponding to said selected receiving frequency;
- control means operable on the basis of a clock signal having a respective frequency and higher order harmonic components thereof for controlling operation of at least said synthesizer section of said receiver means;
- and
- clock generating means for providing said clock signal, said clock generating means including an oscillator having a predetermined oscillating frequency to which said frequency of said clock signal corresponds and means responsive to said information signal for shifting the frequency of said clock signal by an amount .DELTA.f=fc/2n, where fc is the frequency of said clock signal and n is the average of the orders of the higher harmonic components of said clock signal within said predetermined frequency band so as to shift each higher harmonic component of said clock signal or of a frequency-divided version of said clock signal substantially one-half the frequency difference between the higher harmonic components of said clock signal when said selected receiving frequency is a frequency disturbed by at least one of said higher harmonic components of said clock signal or of said frequency-divided version of said clock signal.
An electronic apparatus as in claim 7;
- in which said oscillator is normally oscillating at said frequency of the clock signal;
- and said means for shifting the clock signal includes a capacitor dimensioned to shift said clock signal frequency by said amount .DELTA.f when connected between said oscillator and ground, and transistor means for connecting said capacitor to ground when turned ON by said information signal.
Dependencies are inferred from the claim text.