摘要 |
<p>A digital demodulator which will need no absolute phasing circuit is provided. A known-pattern BPSK signal generating circuit 6 generates the same known-pattern BPSK signal as a known-pattern BPSK signal in a received digital modulated wave in synchronism with the known-pattern BPSK signal in the received digital modulated wave, a carrier-reproducing phase error detecting circuit 7 has a phase error table where one of reference phases in a signal point position of a demodulation baseband signal is made a convergence point, a phase error voltage corresponding to a phase error between a phase determined from the signal point position of the demodulation baseband signals and a phase convergence point is sent out, by enable-controlling a carrier-reproducing loop filter 8 according to the known-pattern BPSK signal outputted from the known-pattern BPSK signal generating circuit 6, the phase error voltage is smoothed, and carrier reproduction is performed while controlling the frequency of a reproduced carrier according to the smoothed output so that the phase in the signal point position coincides with the phase convergence point. <IMAGE></p> |
申请人 |
KABUSHIKI KAISHA KENWOOD |
发明人 |
KATOH, HISAKAZU;HASHIMOTO, AKINORI;IWADATE, YUICHI;SHIBUYA, KAZUHIKO;MINEMATSU, FUMIAKI;ITOH, SHIGEYUKI;SAITO, TOMOHIRO;SHIRAISHI, KENICHI;HORII, AKIHIRO;MATSUDA, SHOJI;SHINJO, SOICHI |