Claims
- 1. A digital demodulator of a receiver for digital broadcasting which receives and transmits digital modulated waves created by time-base-multiplexing waves modulated by a plurality of modulation systems, comprising:known-pattern signal generating means for generating in synchronism with known-pattern signals in received digital modulated waves the same known-pattern signal as a known-pattern BPSK signal in the received digital modulated waves; carrier-reproducing phase error detecting means, which comprises a phase error table having one reference phase as a convergence point between two reference phases of signal point positions of BPSK demodulation baseband signals, for sending out a phase error output based on a phase error between the phase obtained from the signal point position of the demodulation baseband signals and the phase convergence point; and a carrier-reproducing loop filter which is controlled for enablement based on the known-pattern signals outputted from the known-pattern signal generating means and smoothes the phase error outputs during an enabling period, wherein carrier reproduction is implemented by controlling the frequency of a reproduced carrier so that, based on the output of the carrier-reproducing loop filter, the phase of said signal point position coincides with the phase convergence point.
- 2. The digital demodulator according to claim 1, characterized in that the carrier-reproducing loop filter is controlled to enablement for the period of low potential of the known-pattern signals outputted from the known-pattern signal generating means.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-032303 |
Jan 1998 |
JP |
|
Parent Case Info
This application is a 371 of PCT/JP99/00400, filed on Jan. 29, 1999.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP99/00400 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/39486 |
8/5/1999 |
WO |
A |
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JP |
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