Patent ID: 7301377
Filing Date: 2007-11-27
Classification: H03J,H03L,H04B

Abstract:
1. A demodulation apparatus for demodulating a high-frequency signal comprising a spread spectrum signal, the apparatus comprising: frequency conversion means for converting said high-frequency signal to an intermediate frequency; signal processing means for performing a signal processing on an intermediate-frequency signal having said intermediate frequency obtained through said frequency conversion means; and setting means for performing settings on said frequency conversion means and said signal processing means; wherein said frequency conversion means includes local oscillation signal generation means for generating a local-oscillation signal having a local oscillation frequency for converting a frequency of said high-frequency signal into said intermediate frequency based on a source oscillation signal generated by a source oscillator; said setting means counts said source oscillation signal generated by said source oscillator using as a gate signal the oscillation signal generated by another oscillator of known frequency different from said source oscillator and the setting means makes a judgment of said source oscillation frequency of said source oscillation based on said count value; and said signal processing means includes signal generation means for sharing said local oscillation signal generator means and said source oscillator and for generating a signal having a predetermined frequency based on said source oscillation signal generated by said source oscillator.