| 摘要 |
PROBLEM TO BE SOLVED: To reproduce a symbol clock signal with a correct phase even when phase offset is residual in a base band signal. SOLUTION: A phase quantizing part 1 samples an in-phase signal and a quadrature signal, for which the frequency of a received modulation wave is converted to the base band signal, calculates the phase and performs quantization (quantized phasing) later and a phase change amount calculating part 4 calculates the phase change amount of the said quantized phase at plural symbol cycle times. A timing detecting part 5a detects the timing when the said phase change amount is closest to a phase change amount determined for each modulation system. A timing synchronizing means 3 reproduces the symbol clock synchronized with the said timing. Thus, even when phase offset is residual, the clock signal can be reproduced with the correct phase. |
