| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a symbol delay synchronization demodulating circuit for generating symbol data from a quadrature detection signal, using as a symbol demodulation clock signal a clock signal in which a phase does not match a symbol point interval in the quadrature detection signal although a frequency matches a symbol speed. <P>SOLUTION: A delay circuit 36 delays and outputs an inputted quadrature detection signal. A sample and hold circuit 38 samples the quadrature detection signal at a predetermined frequency, and an amplitude calculating circuit 40 and a dispersion calculating circuit 42 calculate the dispersion of the sampled quadrature detection signal. A delay control circuit 44 controls the delay quantity of the delay circuit 36 so that the dispersion becomes the smallest. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
