公开(公告)号：US4723287A

公开(公告)日：1988-02-02

申请号：US914008

申请日：1986-10-01

申请人： Katsumi Tobita ,  Tamaki Yoshimoto

发明人： Katsumi Tobita ,  Tamaki Yoshimoto

IPC分类号： H04H1/00 ,  H04H40/36 ,  H04N5/60 ,  H04H5/00

CPC分类号： H04H20/88 ,  H04N5/607

摘要： A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are transmitted together with a video signal, the selected signal is given to an intercarrier demodulator and an aural signal band-pass filter, the intercarrier demodulator provides a beat signal corresponding to the difference between the video carrier and the sound subcarrier, the beat signal is demodulated to obtain the sum signal, and the sound subcarrier provided by the sound signal band-pass filter is demodulated to obtain the difference signal and the pilot signal. The demodulating system is intended to eliminate disturbing signals included in the composite signal and buzzing, and to obviate the malfunction of the MPX decoder due to the disturbing signal having the same frequency as that of the pilot signal.

摘要翻译： 一种用于多传播电视系统的解调系统，其被构造成使得调谐器被调谐以接收与视频信号一起发送的和信号和听觉信号和导频信号的差分信号，所选择的信号被给予 载波解调器和听觉信号带通滤波器，帧载波解调器提供与视频载波和声音副载波之间的差分相对应的拍频信号，对该信号进行解调以获得和信号，并且由 声信号带通滤波器被解调以获得差分信号和导频信号。 解调系统旨在消除复合信号中包含的干扰信号和嗡嗡声，并且由于干扰信号具有与导频信号相同的频率，从而消除MPX解码器的故障。