| 摘要 |
PROBLEM TO BE SOLVED: To demodulate the phase modulated signal part without influence on the phase condition in the slot (signal part) of the preceding amplitude modulation system. SOLUTION: The phase modulated signal demodulation circuit demodulates a second signal part by inputting a receiving signal including the second signal part modulated by a second modulation system of the phase modulation system after a first signal part modulated with a first modulation system of the phase modulation system. The phase modulated signal demodulation circuit comprises a phase demodulation circuit for demodulating an input signal in accordance with the second modulation system, a data reproducing circuit for reproducing data from the demodulated baseband signal, a DC-cut capacitor inserted between the phase demodulation circuit and the data reproducing circuit, and an unwanted element removing means for removing unwanted element by the phase of the first signal part from the demodulated signal part for the second signal part. This digital demodulator is formed by introducing the phase modulated signal demodulation circuit of the invention. COPYRIGHT: (C)2007,JPO&INPIT
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