| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase reference burst signal extraction circuit that continuously extracts only a signal inserted during a burst symbol signal period out of received signals. SOLUTION: A frame synchronizing signal detection circuit 2 detects a frame synchronizing signal from an output of a PSK demodulation circuit, recovers a symbol clock from the output, a symbol counter 9 counts symbol clocks by 192 times from a head position of the detected frame synchronizing signal, a symbol counter 11 counts symbol clocks by 207 times in succession to the end of the count by the counter 9, a burst symbol period detector 13 receiving the count of the symbol counter 11 outputs a burst symbol period signal from the start of count of the symbol clocks by 204 times until end of the count by 207 times, a 1/52 frequency divider 4 applies 1/52 frequency division to the symbol clocks, an FIFO 5 latches MSB data in I data at a PSK demodulation output for a period of the burst symbol period signal by using the symbol clocks for a write clock and the FIFO 5 outputs the written MSB data by using an output of the 1/52 frequency divider 4 for a read clock. |
