CARRIER WAVE REPRODUCTION SYSTEM AND EQUIPMENT FOR RECEIVING DIGITAL BROADCAST

CARRIER WAVE REPRODUCTION SYSTEM AND EQUIPMENT FOR RECEIVING DIGITAL BROADCAST

PROBLEM TO BE SOLVED: To obtain stable reception characteristics by holding synchronization of reproduction of a carrier wave even at low C/N by reproducing the carrier wave by a signal in a specified modulation system. SOLUTION: An inputted signal from a high frequency input terminal 10 is selected...

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Hauptverfasser: SUGIYAMA YOSHIICHI, SHIROSUGI TAKATOSHI, WADA KENJI, AKIYAMA MORIYOSHI, NODA MASAKI
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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creator SUGIYAMA YOSHIICHI
SHIROSUGI TAKATOSHI
WADA KENJI
AKIYAMA MORIYOSHI
NODA MASAKI
description PROBLEM TO BE SOLVED: To obtain stable reception characteristics by holding synchronization of reproduction of a carrier wave even at low C/N by reproducing the carrier wave by a signal in a specified modulation system. SOLUTION: An inputted signal from a high frequency input terminal 10 is selected, is converted into a digital signal, is digitally demodulated by a Costas loop 61, the modulated signal is inputted in a unique word detecting circuit 6, a unique word is detected the timing of transmission multiplex control information and that of a burst signal are decided and a pulse signal is generated from a timing generator 19a. In addition, a demodulated signal is decoded by a Viterbi/trellis decoding 7, the timing of a BPSK modulation signal in a transmission main signal is determined by a transmission multiplex control information which is decoded by transmission multiplex control information decoding 8 and a pulse signal is generated from a timing generator 29b. The pulse signal is added by an adder 10, a Costas loop opening/closing switch 5 is closed in binary phase modulation (BPSK) signal period, transmission multiplex control information period, burst signal period and the carrier wave reproduction is performed.
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subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
MULTIPLEX COMMUNICATION
PICTORIAL COMMUNICATION, e.g. TELEVISION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
title CARRIER WAVE REPRODUCTION SYSTEM AND EQUIPMENT FOR RECEIVING DIGITAL BROADCAST
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