| 摘要 |
PURPOSE:To attain accurate demodulation with simple constitution by sampling twice a phase continuous FSK modulation signal subject to waveform shaping in one bit, ORing exclusively two values and demodulating the result. CONSTITUTION:A timer 13 generates a timing pulse and a sampling circuit 8 samples a modulation signal applied to an input terminal 7 by the timing pulse from a timer 13. Then an exclusive OR circuit 10 operates an output from a shift register 9 with an output from the sampling circuit 8. Then a frequency division circuit 11 applies 1/2 frequency division to a timing pulse from the timer 13 and outputs the result, and its frequency division timing latches an output signal from the exclusive OR circuit 10 by using a latch circuit 12. |
