Patent ID: 8204162

Claim:
A receiver having a reception frequency control circuit, wherein the receiver receives and demodulates a frequency shift keying modulated digital signal, comprising: a reception signal processing unit to convert the received digital signal to an intermediate frequency, based on a pre-given frequency set signal, to eliminate an unnecessary signal therefrom and to supply a constant amplitude intermediate frequency signal, whose voltage amplitude is set constant, to a frequency voltage converting unit; said frequency voltage converting unit is to convert the constant amplitude intermediate frequency signal to a baseband signal having voltage amplitude by frequency-voltage conversion, and to set the same as an output signal and to supply the output signal to an analog frequency controlling unit to correct a frequency deviation component; said analog frequency controlling unit is to extract the frequency deviation component contained in the output signal in analog form and to supply the same to a digital frequency controlling unit as a pulse signal; and said digital frequency controlling unit is to change the pulse signal into digital form thereby to eliminate a noise component, and to average the digitized signal, to convert the signal to a fundamental frequency set value, to correct the fundamental frequency set value and and to feed back the same to the reception signal processing unit.