Patent ID: 6993096
Filing Date: 2006-01-31
Classification: H04L,H04N

Abstract:
1. A broadcast satellite (BS) digital broadcasting receiver for receiving BS digital signals wherein bi-phase shift keying (BPSK), quadrature-phase shift keying (QPSK), and 8-phase shift keying (8PSK) modulation waves are time-division-multiplexed, said BS digital broadcasting receiver comprising: a first demodulator circuit having a first carrier regenerating circuit for regenerating a carrier for demodulation based on a phase error in demodulation data of a BPSK modulation section; a second demodulator circuit having a second carrier regenerating circuit for regenerating a carrier for demodulation based on a phase error in the demodulation data of the BPSK, QPSK, and 8PSK modulation sections; and a selector for, when a lock of the carrier regenerated by the first carrier regenerating circuit is maintained and the carrier regenerated by the second carrier regenerating circuit is in a locked state, selecting the demodulation data of the 8PSK modulation section outputted from the second demodulator circuit and selecting the demodulation data of the BPSK modulation section and the QPSK modulation section outputted from the first demodulator circuit to output the selected data.