Patent ID: 7263059

Claim:
A high-frequency receiving apparatus receiving and demodulating a high-frequency signal modulated to a digital signal, comprising: an analog-digital converter converting an analog signal as a received signal to a digital signal; an oscillator having a controllable oscillation frequency and outputting a carrier regeneration signal; a multiplier multiplying a digital signal generated by said analog-digital converter and a carrier regeneration signal generated by said oscillator; a phase pull-in circuit controlling said oscillator to adjust a phase of an output signal of said multiplier to a predetermined target phase; a frequency pull-in circuit controlling said oscillator to adjust a frequency of an output signal of said multiplier to a predetermined target frequency; a frequency shift circuit controlling said oscillator to make a frequency of an output signal of said multiplier shift by a predetermined frequency; and a control circuit controlling said phase pull-in circuit, said frequency pull-in circuit and said frequency shift circuit, wherein said control circuit has a plurality of algorithms to pull a phase and a frequency of an output signal of said multiplier into said target phase and said target frequency respectively, and controls said phase pull-in circuit, said frequency pull-in circuit and said frequency shift circuit according to an algorithm selected from said plurality of algorithms.