| 摘要 |
<p>A demodulator for demodulating an intermediate frequency (IF) signal of a PSK-modulated signal and for producing decoded data includes a zero-cross detector for detecting the zero-cross points of the IF signal and for generating a zero-cross detection signal, synchronizing means responsive to a baud-timing signal derived from the IF signals and the zero-cross detection signal for synchronizing the baud-timing signal with the zero-cross signal and for producing a synchronized baud-timing signal, an oscillator for generating a clock signal having a predetermined frequency, a counter responsive to the clock signal for counting the clock signal and for producing a counter output, a phase difference detector responsive to the counter ouput and the synchronized baud-timing signal for calculating a change in the counter output per period of the synchronized baud-timing signal and for producing the result as phase difference data, and decision means responsive to the phase difference data for deciding received data based on the phase difference data and for producing the result of the decision as the decoded data. <IMAGE></p> |
