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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。
    • 3. 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。
    • 4. 发明授权
    • Method for removing AM neighboring interference and a circuit for the same
    • 用于去除AM相邻干扰的方法和用于其的电路
    • US07043026B1
    • 2006-05-09
    • US09247826
    • 1999-02-11
    • Kenichi ShiraishiAtsushi Shinoda
    • Kenichi ShiraishiAtsushi Shinoda
    • H04H5/00H04B1/10
    • H04H40/36H04B1/1018
    • An AM neighboring interference removing method and circuit is provided which can select only a desired AM modulation wave even if an interference AM modulation wave is partially superposed upon the desired AM modulation wave. An AM modulation wave desired to be received is multiplied at multipliers by local oscillation signals having frequencies 3fc/2 and fc/2 where fc is the carrier frequency of a neighboring interference AM modulation wave. High frequency components contained in the outputs of the multipliers are removed by low-pass filters. Of the outputs of the low-pass filters, the carrier frequency of the neighboring interference wave is fc/2 and the AM carrier frequencies of the AM stereo modulation wave are (fc/2+fα) and (fc/2−fα), where fα is a difference frequency between the AM carrier frequency of the AM stereo modulation wave and the carrier frequency of the neighboring interference wave. A subtractor subtracts the output of one of the low-pass filter from the output of the other to thereby cancel out the neighboring interference wave. This subtraction signal is passed through a low-pass filter having a cut-off frequency of fc/2 to derive only the AM stereo modulation wave.
    • 提供了一种AM相邻干扰去除方法和电路,其即使干扰AM调制波部分地叠加在期望的AM调制波上也可以仅选择期望的AM调制波。 需要接收的AM调制波通过具有频率3fc / 2和fc / 2的本地振荡信号乘以乘法器,其中fc是相邻干扰AM调制波的载波频率。 通过低通滤波器去除乘法器的输出中包含的高频分量。 在低通滤波器的输出中,相邻干扰波的载波频率为fc / 2,AM立体声调制波的AM载波频率为(fc / 2 + falpha)和(fc / 2-falpha), 其中falpha是AM立体声调制波的AM载波频率与相邻干扰波的载波频率之间的差分频率。 减法器从另一个的输出中减去一个低通滤波器的输出,从而抵消相邻的干扰波。 该减法信号通过具有截止频率fc / 2的低通滤波器,仅导出AM立体声调制波。
    • 5. 发明授权
    • AM modulated wave eliminating circuit
    • AM调制消除电路
    • US06301295B1
    • 2001-10-09
    • US09257048
    • 1999-02-25
    • Atsushi ShinodaKenichi Shiraishi
    • Atsushi ShinodaKenichi Shiraishi
    • H04L2706
    • H04L27/206H03D5/00
    • The present invention provides an AM modulated wave eliminating circuit which is capable of extracting a digital modulated wave by cancelling an AM modulated wave from an AM data multiplex modulated wave. A composite wave is composed of an AM carrier wave in-phase signal, an AM carrier wave reverse-phase signal and a digital modulated wave is extracted from an AM data multiplex modulated wave composed of an AM stereo modulated wave multiplexed with a digital modulated wave within the same frequency band, values corresponding to different phase deflection angles of an AM stereo output from a phase level generator (21) are multiplied by the AM carrier wave in-phase signal with multipliers (221 through 22n), multiplication outputs are added to the composite wave with adders (231 through 23n), a phase deflection angle corresponding to an output at a minimum level out of addition outputs is determined with a phase presumer (24), a value corresponding to a determined phase deflection angle is selected from an output of a phase level generator (21) with a phase level selector (25), a selected value is multiplied by an AM carrier wave in-phase signal component with a multiplier (26), a multiplication output is added to the composite wave with an adder (27) and an addition output is used as a digital modulated wave.
    • 本发明提供一种能够通过从AM数据多路复用调制波消除AM调制波来提取数字调制波的AM调制波消除电路。 复合波由AM载波同相信号组成,AM载波反相信号和数字调制波从由与数字调制波复用的AM立体声调制波组成的AM数据多路调制波提取 在相同频带内,对应于来自相位电平发生器(21)的AM立体声输出的不同相位偏转角的值与乘法器(221至22n)与AM载波同相信号相乘,乘法输出被加到 具有加法器(231至23n)的复合波,相对于相位输出的最小电平处的输出的相位偏转角由相位推算器(24)确定,与所确定的相位偏转角对应的值从 用相位电平选择器(25)输出相位电平发生器(21),所选择的值与乘法器(26)乘以AM载波同相信号分量,乘法器 使用加法器(27)将阳离子输出添加到复合波,并且使用相加输出作为数字调制波。
    • 6. 发明授权
    • Carrier reproducing circuit
    • 载波再现电路
    • US06947512B1
    • 2005-09-20
    • US09763958
    • 1999-08-26
    • Atsushi ShinodaKenichi Shiraishi
    • Atsushi ShinodaKenichi Shiraishi
    • H04L27/00H04L27/227H04L25/40
    • H04L27/2273H04L2027/0032H04L2027/0057H04L2027/0067H04L2027/0095
    • A carrier reproducing circuit capable of judging the polarity of alienation frequency. A TMCC section is detected from the synchronous detection output from a synchronous detection circuit (1) by a TMCC section detecting circuit (4), the synchronous detection output is converted to a signal point arrangement by a signal point arrangement converting circuit (5), the phase of the converted signal point position signal is rotated at a predetermined angular velocity for each symbol of the TMCC by a phase rotating circuit (8), the signal position signal whose phase is rotated is phase-detected by a phase detector (6), an auto-correlation function of the phase detection output in the TMCC section is determined by an auto-correlation function determining circuit (7) and angular velocity information based on the period of the waveform of the determined auto-correlation function is obtained, the phase-rotation angular velocity at the phase rotation circuit (8) is subtracted from the obtained angular velocity by a subtracting circuit (9), and sine and cosine wave data on frequency based on the output of the subtraction are generated and sent to the phase detection circuit (1) by a numerical control oscillator (2).
    • 一种能够判断异常频率极性的载波再现电路。 通过TMCC部分检测电路(4)从同步检测电路(1)的同步检测输出检测TMCC部分,同步检测输出由信号点排列转换电路(5)转换成信号点排列, 转换的信号点位置信号的相位通过相位旋转电路(8)以TMCC的每个符号以预定角速度旋转,其相位旋转的信号位置信号由相位检测器(6)相位检测, 通过自相关函数确定电路(7)确定TMCC部分中的相位检测输出的自相关函数,并且获得基于所确定的自相关函数的波形周期的角速度信息, 通过减法电路(9)从获得的角速度中减去相位旋转电路(8)的相位旋转角速度,正弦和余弦波d 基于减法输出的频率的ata频率被产生并通过数字控制振荡器(2)发送到相位检测电路(1)。