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    • 1. 发明授权
    • AM data multiplexing modulation apparatus
    • AM数据复用调制装置
    • US5940365A
    • 1999-08-17
    • US870016
    • 1997-06-05
    • Toshiyuki TakegaharaShoichi SuzukiKenichi ShiraishiHiroyuki NagasakaRyuichi OkazakiAtsushi Shinoda
    • Toshiyuki TakegaharaShoichi SuzukiKenichi ShiraishiHiroyuki NagasakaRyuichi OkazakiAtsushi Shinoda
    • H04L27/04H04J1/00H04J9/00H04L5/06H04L27/12H04L27/20H04L27/26H04J11/00
    • H04H20/36H04L5/06
    • An AM data multiplexing modulation apparatus for multiplexing a digital signal to an AM modulation signal without adversely affecting an AM sync detection output even if AM sync detection is performed. An AM modulator AM modulates a carrier having a frequency fc by an input signal, an orthogonal modulator 3 orthogonally modulates a carrier having a frequency (fc+f.alpha.) by a QPSK baseband digital signal generated by a QPSK baseband digital signal generator 2, a sign inverter and a complex conjugate unit change the sign of a signal having the same phase as a reference carrier of vector shift and corresponding to a dibit formed by the QPSK baseband digital signal generated by the QPSK baseband digital signal generator, another orthogonal modulator orthogonally modulates a carrier having a frequency (fc-f.alpha.) by an output of the complex conjugate unit, the outputs of the two orthogonal modulators are added by an adder, this addition result is added to the output of the AM modulator by another adder which outputs an AM data multiplexing modulation output.
    • 一种AM数据多路复用调制装置,即使执行AM同步检测,也将数字信号复用到AM调制信号,而不会对AM同步检测输出产生不利影响。 AM调制器AM通过输入信号调制具有频率fc的载波,正交调制器3通过由QPSK基带数字信号发生器2产生的QPSK基带数字信号对频率(fc +fα1)进行正交调制, 符号反相器和复共轭单元改变与矢量移位的参考载波具有相同相位的信号的符号,并且对应于由QPSK基带数字信号发生器产生的QPSK基带数字信号形成的二进制,另一个正交调制器正交调制 通过复共轭单元的输出具有频率(fc-fα)的载波,两个正交调制器的输出由加法器相加,该相加结果通过另一个加法器相加到另一加法器的输出 AM数据复用调制输出。
    • 2. 发明授权
    • Apparatus for demodulating AM data multiplexed modulated wave signal
    • 用于解调AM数据多路复用调制波信号的装置
    • US5970046A
    • 1999-10-19
    • US889575
    • 1997-07-08
    • Toshiyuki TakegaharaShoichi SuzukiKenichi ShiraishiHiroyuki NagasakaAtsushi Shinoda
    • Toshiyuki TakegaharaShoichi SuzukiKenichi ShiraishiHiroyuki NagasakaAtsushi Shinoda
    • H04B1/04H04B1/30H04J11/00
    • H04B1/04H04B1/30
    • An apparatus for demodulating an AM data multiplexed modulated wave signal in which an analog modulated signal and digital modulated signals are multiplexed, in order to derive therefrom a baseband digital signal. The demodulation apparatus aims to derive the digital baseband signal from the AM data multiplexed modulated wave signal in which the analog modulated signal obtained by amplitude modulating a carrier having a frequency fc with an analog signal and the digital modulated signals at frequency position of (fc+f.alpha.) and (fc-f.alpha.) line-symmetrical with respect to a frequency axis of the frequency fc are multiplexed. A demodulation apparatus includes an AM type modulated wave signal eliminating circuit for removing an AM modulated wave signal from an input AM data multiplexed modulated wave signal, and a data demodulation circuit for receiving an output of the AM type modulated wave signal eliminating circuit and for deriving therefrom a baseband digital signal.
    • 一种用于解调其中模拟调制信号和数字调制信号被多路复用的AM数据复用调制波信号的装置,以便从中得到基带数字信号。 解调装置旨在从AM数据复用调制波信号导出数字基带信号,其中通过对具有模拟信号的频率fc的载波进行幅度调制而获得的模拟调制信号和频率位置处的(fc + fα)和(fc-fα)相对于频率fc的频率轴线对称的多路复用。 解调装置包括:AM型调制波信号消除电路,用于从输入的AM数据复用调制波信号中去除AM调制波信号;以及数据解调电路,用于接收AM型调制波信号消除电路的输出, 从而提供基带数字信号。