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    • 65. 发明授权
    • Multiplex TV signal processing apparatus
    • 多路电视信号处理装置
    • US4985769A
    • 1991-01-15
    • US174452
    • 1988-03-23
    • Yoshio YasumotoSadashi KageyamaShuji InoueYoshio AbeHideyo Uwabata
    • Yoshio YasumotoSadashi KageyamaShuji InoueYoshio AbeHideyo Uwabata
    • H04N7/08H04N11/24
    • H04N11/008H04N7/08
    • Disclosed are multiplex television signal processing apparatuses in a television signal transmitting and receiving system. An apparatus at the transmitting side comprises: a signal separator to separate a multiplex signal into a first and a second part; a time-multiplexer to time-multiplex a main television signal and the first part of the multiplex signal to obtain a time-multiplexed main signal; a first amplitude-modulator for modulating a first carrier by the multiplexed main signal to obtain a vestigial side band signal, amplitude-modulated main signal; a second amplitude-modulator for modulating a second carrier which is same in frequency as but different in phase by 90 degrees from the first carrier by a second multiplex signal; an inverse Nyquist filter for filtering this signal to obtain a vestigial side band, amplitude-modulated multiplex signal; and an adder for adding the vestigial side band, amplitude-modulated main and multiplex signals to obtain a multiplexed signal.An apparatus at the receiving side comprises: a Nyquist filter for filtering the multiplexed signal; a carrier regenerator for regenerating the first and second carriers from the multiplexed signal; a main signal detector for detecting the main signal from the multiplexed signal passed through the Nyquist filter by using the first carrier; a filter for removing quadrature distortion from the multiplexed signal; a multiplex signal detector for detecting the first multiplex signal from the multiplexed signal passed through the filter by using the second carrier; a time-demultiplexer to time-demultiplexing the main signal into a main television signal and a second multiplex signal; and a signal composer for composing the first and second multiplex signal to obtain the original multiplex signal.
    • 公开了一种电视信号发送和接收系统中的多路复用电视信号处理装置。 在发送侧的装置包括:信号分离器,用于将多路复用信号分离成第一和第二部分; 时分复用器,用于时分复用主电视信号和多路复用信号的第一部分,以获得时分复用的主信号; 第一幅度调制器,用于通过所复用的主信号调制第一载波,以获得残留边带信号,幅度调制主信号; 第二幅度调制器,用于通过第二多路复用信号调制与第一载波频率相同但相位相差90度的第二载波; 逆奈奎斯特滤波器,用于对该信号进行滤波以获得残留边带,调幅多路复用信号; 以及用于将残留边带,幅度调制的主复用信号和多路复用信号相加以获得复用信号的加法器。 接收侧的装置包括:奈奎斯特滤波器,用于对复用的信号进行滤波; 载波再生器,用于从多路复用信号再生第一和第二载波; 主信号检测器,用于通过使用第一载波从经过奈奎斯特滤波器的复用信号中检测主信号; 滤波器,用于从多路复用信号中去除正交失真; 多路复用信号检测器,用于通过使用第二载波从经过滤波器的复用信号中检测第一多路复用信号; 时分解复用器,将主信号时分解复用成主电视信号和第二多路复用信号; 以及用于构成第一和第二多路复用信号以获得原始多路复用信号的信号编组器。