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    • 3. 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。
    • 4. 发明授权
    • BS digital broadcast receiver
    • BS数字广播接收机
    • US06714596B1
    • 2004-03-30
    • US09582228
    • 2000-07-21
    • Kenichi ShiraishiAkihiro HoriiSoichi ShinjoShoji MatsudaRyuichi Okazaki
    • Kenichi ShiraishiAkihiro HoriiSoichi ShinjoShoji MatsudaRyuichi Okazaki
    • H04L2302
    • H04L1/0052H04L1/0054H04L1/006H04L27/2332H04L2027/0032H04L2027/0057
    • A BS digital broadcast receiver having no 8PSK-demapper and a less number of delay circuits for Trellis encoding. A QPSK baseband signal based upon a reception signal point position of an absolute-phased baseband demodulation signal is Viterbi-decoded by a Viterbi-decoder 6. An output of the Viterbi-decoder is convolution-reencoded by a convolution encoder 7. Upper four bits of phase error data are searched from a phase error table 31 for carrier reproduction in accordance with a phase difference between 0 degree and a phase of a phase error detection reception signal point position. The upper four bits are delayed by delay circuits 81 to 84 by a total sum of a time taken to Viterbi-decode and a time taken to convolution-encode. The delayed outputs are demapped by a demapped value conversion circuit 9. A code TCD2 determined from the demapped output and convolution encode output is output as an MSB of a Trellis 8PSK decode output from an MSB code judging/error detecting circuit 10.
    • 没有8PSK解映射器的BS数字广播接收机和用于网格编码的较少数量的延迟电路。 基于绝对相位基带解调信号的接收信号点位置的QPSK基带信号由维特比解码器6进行维特比解码。维特比解码器的输出由卷积编码器7进行卷积重新编码。高四位 根据0度与相位误差检测接收信号点位置的相位之间的相位差,从用于载波再现的相位误差表31中搜索相位误差数据。 延迟电路81至84通过维特比解码所花费的时间和对卷积编码所花费的时间的总和来延迟高四位。 延迟的输出被去映射值转换电路9解映射。从解映射的输出和卷积编码输出确定的代码TCD2作为从MSB代码判断/错误检测电路10的格状8PSK解码输出的MSB输出。