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    Suppression of effects of co-channel NTSC interference artifacts upon digital TV receiver adaptive equalizer
    91.
    发明授权
    Suppression of effects of co-channel NTSC interference artifacts upon digital TV receiver adaptive equalizer 有权
    抑制同频NTSC干扰伪影对数字电视接收机自适应均衡器的影响

    公开(公告)号：US06441843B1

    公开(公告)日：2002-08-27

    申请号：US09373587

    申请日：1999-08-13

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04N538

    CPC分类号： H04N5/211

    摘要： Adaptive equalizers for digital TV receivers in which the filter parameters are adjusted by decision-feedback are followed in cascade by filters for suppressing unwanted demodulation artifacts of NTSC co-channel interference. The decision-feedback signals are derived from the responses of the filters for suppressing unwanted demodulation artifacts of NTSC co-channel interference. This avoids erroneous adjustments of the filter parameters of the adaptive equalizers that results when the decision-feedback signals are accompanied by demodulation artifacts of carrier components of the NTSC co-channel interference.

    摘要翻译： 通过用于抑制NTSC同频道干扰的不期望的解调伪影的滤波器级联地连接用于通过判决反馈来调整滤波器参数的数字电视接收机的自适应均衡器。 判决反馈信号是从用于抑制NTSC同频道干扰的不想要的解调伪影的滤波器的响应导出的。 这避免了当判决反馈信号伴随着NTSC同频道干扰的载波分量的解调伪影时导致的自适应均衡器的滤波器参数的错误调整。

    Bandpass phase tracker with hilbert transformation before plural-phase analog-to-digital conversion
    93.
    发明授权
    Bandpass phase tracker with hilbert transformation before plural-phase analog-to-digital conversion 失效
    带通相位跟踪器，在多相模数转换之前采用希尔伯特变换

    公开(公告)号：US5982820A

    公开(公告)日：1999-11-09

    申请号：US891210

    申请日：1997-07-10

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04N5/44 ,  H03M1/12 ,  H04L27/06 ,  H04L27/38 ,  H04N9/64 ,  H04L27/14

    CPC分类号： H04L27/06

    摘要： The tuner in a digital TV receiver converts received signal to a penultimate intermediate-frequency signal. Penultimate local oscillations are supplied in a first phasing and in a second phasing in quadrature therewith, for heterodyning with the penultimate IF signal in first and second mixers respectively to generate real and imaginary components of an ultimate intermediate-frequency signal. The first and second mixers are of a switching type, switching in respective response to the penultimate local oscillations as supplied in first and in second phasing. First analog-to-digital conversion circuitry containing a number N of analog-to-digital converters digitizes the real component of the ultimate IF signal on an N-phase basis, N being at least one. Second analog-to-digital conversion circuitry, which contains a number N of analog-to-digital converters, digitizes the imaginary component of the ultimate IF signal on an N-phase basis. A complex digital carrier signal is generated at the frequency of the radio carrier wave as translated to the ultimate IF signal band. Synchrodyning circuitry responds to the complex digital carrier signal supplied as ultimate local oscillations, and to the digital samples of the real and imaginary components of the ultimate IF signal, for recovering in-phase and quadrature-phase components of baseband signal.

    摘要翻译： 数字TV接收机中的调谐器将接收到的信号转换成倒数第二个中频信号。 倒数第二次本地振荡以第一相位和与其正交的第二定相提供，用于分别与第一和第二混频器中的倒数第二IF信号进行外差，以产生最终中频信号的实部和虚部。 第一和第二混频器是开关类型的，它们分别响应于第一和第二阶段提供的倒数第二个本地振荡。 包含数字N个模数转换器的第一模数转换电路在N相基础上对最终IF信号的实部进行数字化，N至少为1。 包含数字N个模数转换器的第二模数转换电路在N相基础上数字化最终IF信号的虚分量。 在无线电载波的频率处生成复数数字载波信号，转换为最终的IF信号频带。 同步振荡电路响应作为最终局部振荡提供的复数数字载波信号，以及最终IF信号的实部和虚部的数字样本，用于恢复基带信号的同相和正交相分量。

    Radio receiver detecting digital and analog television radio-frequency signals with single first detector
    94.
    发明授权
    Radio receiver detecting digital and analog television radio-frequency signals with single first detector 失效
    无线电接收机用单个第一检测器检测数字和模拟电视射频信号

    公开(公告)号：US5982457A

    公开(公告)日：1999-11-09

    申请号：US825711

    申请日：1997-03-19

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04N5/52 ,  H03J7/02 ,  H04N5/44 ,  H04N5/46 ,  H04N5/50

    CPC分类号： H04N5/46 ,  H03J7/02 ,  H04N5/4401 ,  H04N5/50

    摘要： Radio receivers for receiving DTV signals, in accordance with the Advanced Television Systems Committee (ATSC) standard, or analog TV, in accordance with the National Television Sub-Committee (NTSC) standard, each use a single first detector for both types of signal. This single first detector supplies its output signals to an intermediate-frequency amplifier chain for TV signals and to another intermediate-frequency amplifier chain for analog TV signals. The response of the IF amplifier chain for DTV signals is synchrodyned to baseband, supplied to symbol decoding circuitry, and used by first automatic gain control circuitry to develop AGC for amplifier stages in that IF amplifier chain when DTV signals are received. The response of the IF amplifier chain for analog TV signals is supplied to a video detector, and second automatic gain control circuitry develops AGC for amplifier stages in that IF amplifier chain from the composite video signal reproduced by the video detector when analog TV signals are received. In some of the radio receivers the sound carrier of the NTSC signal has a separate, further intermediate-frequency amplifier chain. The absence of 4.5 MHz intercarrier sound is detected when DTV signals are received to automatically fine tune the first detector in response to pilot carrier and to obtain delayed AGC for the radio-frequency amplifier from the first AGC circuitry. The presence of intercarrier sound is detected when analog TV signals are received, to automatically fine tune the first detector in response to video carrier and to obtain delayed AGC for the radio-frequency amplifier from the second AGC circuitry.

    摘要翻译： 根据国家电视分委会（NTSC）标准，根据高级电视系统委员会（ATSC）标准或模拟电视接收DTV信号的无线电接收机每个都使用单个第一检测器用于两种类型的信号。 该单个第一检测器将其输出信号提供给用于TV信号的中频放大器链和用于模拟TV信号的另一个中频放大器链。 用于DTV信号的IF放大器链的响应与基带同步，提供给符号解码电路，并被第一自动增益控制电路用于为接收到DTV信号时的IF放大器链中的放大器级开发AGC。 用于模拟TV信号的IF放大器链的响应被提供给视频检测器，并且第二自动增益控制电路在接收到模拟TV信号时从视频检测器再现的复合视频信号中为该IF放大器链中的放大器级开发AGC 。 在一些无线电接收机中，NTSC信号的声音载体具有单独的另外的中频放大器链。 当DTV信号被接收以响应于导频载波自动微调第一检测器并且从第一AGC电路获得用于射频放大器的延迟AGC时，检测到4.5MHz载波间声音的缺失。 当接收到模拟电视信号时检测到载波间声音的存在，以响应于视频载波自动微调第一检测器并从第二AGC电路获得用于射频放大器的延迟的AGC。

    Dynamically adaptive equalizer system and method
    95.
    发明授权
    Dynamically adaptive equalizer system and method 失效
    动态自适应均衡器系统及方法

    公开(公告)号：US5901175A

    公开(公告)日：1999-05-04

    申请号：US832674

    申请日：1997-04-04

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H03H17/06 ,  H03H21/00 ,  H03H7/30

    CPC分类号： H03H21/0012 ,  H03H17/06

    摘要： An adaptive filter or equalizer for digital data communication includes, a first cascade circuit connected to operate as a digital finite-impulse-response (FIR) filter, the first cascade circuit having a respective first single input for receiving samples of complex input data, a respective second input composed of a first plurality of input taps for receiving filter weighting signals, and a respective output for producing samples of filtered data. An error signal generator responds to samples supplied from the output of first cascade circuit to generate samples of an error signal. A second cascade circuit, which includes the form of an FIR filter of inverse canonical form, a respective first single input for receiving said delayed samples of complex input data, a respective second input composed of a second plurality of input taps for consecutively receiving said samples of said error signal from error signal generator, a third single input, and a respective output, which supplies samples fed back to the third input for yielding a succession of weighting signals. Storage registers at the inputs of the first and second cascade circuits are updated by weighting signals and by error signal samples, respectively, serving to multiplex application of single inputs to multiple cascade stages.

    摘要翻译： 用于数字数据通信的自适应滤波器或均衡器包括连接以作为数字有限脉冲响应（FIR）滤波器工作的第一级联电路，第一级联电路具有用于接收复数输入数据的样本的相应的第一单个输入， 由用于接收滤波器加权信号的第一多个输入抽头组成的各自的第二输入以及用于产生滤波数据样本的相应输出。 误差信号发生器响应从第一级联电路的输出提供的样本以产生误差信号的采样。 第二级联电路，其包括逆规范形式的FIR滤波器的形式，用于接收所述复数输入数据的所述延迟采样的相应的第一单输入端，由用于连续接收所述采样的第二多个输入抽头组成的相应的第二输入 来自误差信号发生器的所述误差信号，第三单个输入和相应的输出，其提供反馈到第三输入的样本，以产生一系列加权信号。 在第一和第二级联电路的输入处的存储寄存器分别通过加权信号和误差信号采样来更新，用于将单个输入多路复用到多个级联级。

    Using special NTSC receiver to detect when co-channel interfering NTSC signal accompanies a digital tv signal
    96.
    发明授权
    Using special NTSC receiver to detect when co-channel interfering NTSC signal accompanies a digital tv signal 失效
    使用特殊的NTSC接收机来检测何时伴随数字电视信号的同频干扰NTSC信号

    公开(公告)号：US5852476A

    公开(公告)日：1998-12-22

    申请号：US882540

    申请日：1997-06-25

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04N7/00 ,  H04N5/21 ,  H04N5/44 ,  H04N5/455

    CPC分类号： H04N5/21 ,  H04N5/455 ,  H04N5/4401

    摘要： A method for detecting when a digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is described for use in a digital television receiver. The video portion of any co-channel interfering NTSC signal is synchrodyned to baseband, for generating an in-phase demodulation result including first artifacts of the digital television signal, and for generating a quadrature-phase demodulation result including second artifacts of the digital television signal. The quadrature-phase demodulation results are phase shifted by 90.degree. at frequencies in a prescribed frequency range before being linearly combined with the in-phase quadrature-phase demodulation results, to generate a linear combining result substantially free of the first and second artifacts of the digital television signal in the prescribed frequency range. An indication that the digital television signal is accompanied by co-channel interfering NTSC signal of substantial amplitude is generated by detecting whenever the amplitude of the linear combining result exceeds a prescribed value.

    摘要翻译： 在数字电视接收机中描述了一种用于检测数字电视信号何时伴有相当幅度的同信道干扰NTSC信号的方法。 任何同频干扰NTSC信号的视频部分与基带同步，用于产生包括数字电视信号的第一假象的同相解调结果，并用于产生包括数字电视信号的第二伪像的正交相位解调结果 。 正交相位解调结果在与同相正交相位解调结果线性组合之前在规定频率范围内的频率相位移90°，以产生基本上不含第一和第二伪像的线性组合结果 数字电视信号在规定频率范围内。 当线性组合结果的幅度超过规定值时，通过检测产生数字电视信号伴随相当幅度的同信道干扰NTSC信号的指示。

    NTSC video signal receivers with reduced sensitivity to interference from co-channel digital television signals
    97.
    发明授权
    NTSC video signal receivers with reduced sensitivity to interference from co-channel digital television signals 失效
    NTSC视频信号接收机对同频道数字电视信号的干扰敏感度降低

    公开(公告)号：US5786870A

    公开(公告)日：1998-07-28

    申请号：US882541

    申请日：1997-06-25

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H04N7/00 ,  H04N5/21 ,  H04N5/44 ,  H04N5/455

    CPC分类号： H04N5/21 ,  H04N5/455 ,  H04N5/4401

    摘要： A video signal receiver with reduced sensitivity to interference from co-channel digital TV signals includes circuitry for selecting a vestigial sideband amplitude-modulation signal descriptive of a video signal, converting the selected VSB AM signal to an intermediate frequency signal, and amplifying the IF signal to provide an amplified IF signal. The VSB AM signal is selected from any single one of a plurality of channels which can contain co-channel interference from a digital television signal. The amplified IF signal is synchronously detected with respect to video carrier frequency for generating an in-phase synchronous detection response and for generating a quadrature-phase synchronous detection response. All frequency components of the quadrature-phase synchronous detection response above a prescribed frequency are phase shifted substantially 90.degree. and are linearly combined with in-phase synchronous detection response for recovering lower frequency portions of the video signal, substantially free of artifacts from any co-channel interfering digital television signal. In some embodiments of the video signal receiver higher frequency portions of the video signal described in the full sideband of the VSB AM signal, but not in its vestigial sideband, are recovered by synchronously detecting the VSB AM signal after selective filtering to remove the pilot carrier signal component of any co-channel digital TV signal. The selective filtering avoids any artifact of such pilot carrier signal being generated when recovering higher frequency portions of the video signal. The lower and the higher frequency portions of the video signal are combined to obtain a fullband video signal.

    摘要翻译： 具有对来自同频道数字电视信号的干扰的敏感度降低的视频信号接收机包括用于选择描述视频信号的残留边带幅度调制信号的电路，将所选择的VSB AM信号转换成中频信号，以及放大IF信号 以提供放大的IF信号。 从可以包含来自数字电视信号的同信道干扰的多个信道中的任何一个信道中选择VSB AM信号。 放大的IF信号相对于视频载波频率被同步检测，用于产生同相同步检测响应并用于产生正交相位同步检测响应。 在规定频率以上的正交相位同步检测响应的所有频率分量相移大致为90°，并且与用于恢复视频信号的较低频率部分的同相同步检测响应线性组合， 频道干扰数字电视信号。 在视频信号接收机的一些实施例中，在VSB AM信号的全边带但不在其残留边带中描述的视频信号的较高频率部分通过在选择性滤波之后同步检测VSB AM信号来恢复，以去除导频载波 任何同频道数字电视信号的信号分量。 选择性滤波避免在恢复视频信号的较高频率部分时产生这种导频载波信号的任何伪影。 视频信号的较低频率部分和较高频率部分被组合以获得全频带视频信号。

    Digital television broadcasting system using coded orthogonal frequency-division modulation with multilevel low-density-parity-check coding
    100.
    发明申请
    Digital television broadcasting system using coded orthogonal frequency-division modulation with multilevel low-density-parity-check coding 审中-公开
    使用具有多级低密度奇偶校验编码的编码正交频分调制的数字电视广播系统

    公开(公告)号：US20160087649A1

    公开(公告)日：2016-03-24

    申请号：US14867930

    申请日：2015-09-28

    申请人： Allen LeRoy Limberg

    发明人： Allen LeRoy Limberg

    IPC分类号： H03M13/11 ,  H03M13/15 ,  H04L5/00 ,  H04L1/00 ,  H04L27/04 ,  H04N21/61 ,  H03M13/00

    CPC分类号： H04L5/0007 ,  H03M13/09 ,  H03M13/1154 ,  H03M13/1165 ,  H03M13/152 ,  H03M13/255 ,  H03M13/356 ,  H03M13/6362 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0057 ,  H04L1/0058 ,  H04L27/04 ,  H04L27/2627 ,  H04L27/2647 ,  H04L27/2655 ,  H04L27/36 ,  H04N21/2383 ,  H04N21/6112

    摘要： In transmitter apparatus for a digital television broadcasting system, internet-protocol (IP) packets of digital television information are subjected to multilevel coding (MLC) before being Gray-mapped to quadrature-amplitude-modulation (QAM) constellations. The constituent codes of the MLC comprise respective low-density parity-check (LDPC) inner coding. Preferably, the LDPC inner coding is LDPC convolutional coding. The QAM constellations are used in coded orthogonal frequency-division modulation (COFDM) of plural carrier waves up-converted to a radio-frequency broadcast television channel. In receiver apparatus for the digital television broadcasting system the results of de-mapping QAM constellations recovered from demodulating the COFDM carrier waves are de-interleaved, and the LDPC constituent codes of the MLC are independently decoded in parallel with decoding results time-interleaved to recover the IP packets of digital television information.

    摘要翻译： 在用于数字电视广播系统的发射机装置中，数字电视信息的因特网协议（IP）分组在灰度映射到正交幅度调制（QAM）星座之前经受多级编码（MLC）。 MLC的组成码包括各自的低密度奇偶校验（LDPC）内部编码。 优选地，LDPC内部编码是LDPC卷积编码。 QAM星座用于上变频到无线电广播电视频道的多个载波的编码正交频分调制（COFDM）。 在数字电视广播系统的接收机装置中，对从解调COFDM载波恢复的解映射QAM星座的解映射结果进行解交织，并且MLC的LDPC组成码与解码结果并行地独立解码，以及时间交织以恢复 数字电视信息的IP包。