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81. 发明授权

US07197685B2 Robust signal transmission in digital television broadcasting 有权
标题翻译：数字电视广播中的稳健信号传输
公开(公告)号：US07197685B2
公开(公告)日：2007-03-27
申请号：US10733645
申请日：2003-12-12
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H03M13/00
CPC分类号： H04L1/0057 , H04L1/0041 , H04L1/0045 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L25/03866 , H04L27/02 , H04L27/3416 , H04N7/16 , H04N21/2383 , H04N21/4382
摘要： A data field of transmitted digital television signals includes a first set of A/53-compliant data segments that convey payload information and further includes a second set of A/53-compliant data segments that contain parity bytes for transverse Reed-Solomon forward-error-correction coding of the data contained within the first set of A/53-compliant data segments. A digital television receiver uses the parity bytes in the second set of A/53-compliant data segments to implement transverse Reed-Solomon forward-error-correction decoding that corrects byte errors in the data contained in the first set of A/53-compliant data segments.
摘要翻译：传输的数字电视信号的数据字段包括传送有效载荷信息的第一组符合A / 53的数据段，并且还包括第二组符合A / 53的数据段，其包含用于横向Reed-Solomon前向误差的奇偶校验字节对包含在第一组A / 53兼容数据段内的数据进行校正编码。数字电视接收机使用第二组A / 53兼容数据段中的奇偶校验字节来实现横向Reed-Solomon前向纠错解码，其纠正包含在第一组A / 53兼容中的数据中的字节错误数据段

82. 发明授权

US07151797B2 Adaptive K-factor-improvement filter for receiver of radio signals subject to multipath distortion 失效
标题翻译：用于接收多径失真的无线电信号的自适应K因子改进滤波器
公开(公告)号：US07151797B2
公开(公告)日：2006-12-19
申请号：US10383085
申请日：2003-03-06
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H03H7/30
CPC分类号： H04N5/211
摘要： An adjustable K-factor-improvement (KFI) filter having a sparse kernel composed of non-zero weighting coefficients of substantially equal amplitudes is included in a receiver for digital television signals or the like. The receiver includes apparatus for measuring the channel impulse response (CIR) or cepstrum of the signal as received. The respective polarities of the non-zero weighting coefficients in the sparse kernel of the adjustable KFI filter are adjusted responsive to the measured CIR. The differential delay between each successive pair of non-zero weighting coefficients in the sparse kernel of the adjustable K-factor-improvement filter is adjusted responsive to the measured CIR. The adjustment is such that the KFI filter response has a principal component with substantially more energy than any of its echo components. The KFI filter response is applied as input signal to subsequent adaptive equalization filtering in the receiver.
摘要翻译：具有由基本相等幅度的非零加权系数组成的稀疏核的可调K因子改善（KFI）滤波器被包括在用于数字电视信号等的接收机中。接收机包括用于测量接收到的信号的信道脉冲响应（CIR）或倒频谱的装置。可调节KFI滤波器的稀疏核中的非零加权系数的相应极性根据测量的CIR进行调整。响应于测量的CIR来调节可调K因子改善滤波器的稀疏核中每个连续的非零加权系数对之间的差分延迟。调整使得KFI滤波器响应具有比其任何回波分量大得多的能量的主分量。将KFI滤波器响应作为输入信号应用于接收机中的后续自适应均衡滤波。

83. 发明授权

US06667760B1 Receiver for digital television signals having carriers near upper frequency boundaries of TV broadcasting channels 有权
标题翻译：数字电视信号接收机，具有靠近电视广播频道高频边界的载波
公开(公告)号：US06667760B1
公开(公告)日：2003-12-23
申请号：US09241372
申请日：1999-02-02
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H04N544
CPC分类号： H04N5/211 , H03D1/2245 , H04L2025/03382 , H04N5/4401
摘要： In a receiver for receiving digital television (DTV) signals with carriers near the upper frequency boundaries of TV broadcasting channels, co-channel interfering NTSC video carrier and its lower frequency sidebands are removed from intermediate-frequency signal by trap filtering, preferably in SAW filtering used in the intermediate-frequency amplifier. Co-channel interfering NTSC chroma burst and lower frequency chroma sidebands also are removed from intermediate-frequency signal by trap filtering. Artifacts of co-channel interfering NTSC audio signal in baseband DTV signal recovered by in-phase synchrodyne circuitry are cancelled using Hilbert-transformed artifacts of co-channel interfering NTSC audio signal recovered by quadrature-phase synchrodyne circuitry. Locating DTV carriers close to 270 kHz below the uppermost limits of the TV broadcasting channels facilitates artifacts arising from chroma signals, video carriers and low-frequency video modulation of co-channel interfering NTSC signals being further reduced using comb filtering.
摘要翻译：在接收电视广播频道高频边界附近载波的数字电视（DTV）信号的接收机中，通过陷波滤波从中频信号中去除同频干扰NTSC视频载波及其低频边带，优选地在SAW滤波用于中频放大器。同频干扰NTSC色度脉冲串和低频色度边带也通过陷波滤波从中频信号中去除。通过同相同步电路恢复的基带DTV信号中的同频道干扰NTSC音频信号的伪像被正交相位同步电路恢复的同信道干扰NTSC音频信号的希尔伯特变换伪像消除。将DTV载波定位在低于电视广播频道最高限制的270 kHz处，便于使用梳状滤波进一步减少色差信号，视频载波和同频道干扰NTSC信号的低频视频调制产生的伪像。

84. 发明授权

US06643334B1 Bandpass tracker for DTV receiver, with VSB I-F signal filtered for more symmetrical AFPC Loop response 有权
标题翻译： DTV接收器的带通跟踪器，具有VSB I-F信号的滤波器用于更对称的AFPC环路响应
公开(公告)号：US06643334B1
公开(公告)日：2003-11-04
申请号：US09431273
申请日：1999-11-01
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H03D124
CPC分类号： H04N5/4446 , H03J7/02 , H04N5/4401 , H04N5/455 , H04N5/50
摘要： Digital radio receivers for digital television signals often employ bandpass trackers in which the bandwidth of the automatic-frequency-and-phase-control (AFPC) loop is determined in the baseband by lowpass filtering after demodulating the intermediate frequency signal. If the I-F signal is vestigial-sideband in nature, and if baseband symbol code is designed to have a spectrum reaching at least substantially to zero-frequency, low-frequency modulation components tend to give rise to phase jitter in the AFPC loop. This is owing to the asymmetry of the modulation sidebands near carrier frequency. To reduce such phase jitter, a filter is introduced before the AFPC detector for reducing asymmetry of channel response in a narrow-frequency band including the pilot carrier signal.
摘要翻译：用于数字电视信号的数字无线电接收机通常采用带通跟踪器，其中在解调中频信号之后通过低通滤波在基带中确定自动频率和相位控制（AFPC）环路的带宽。如果I-F信号本质上属于残留边带，并且如果基带符号码被设计成具有至少基本上达到零频率的频谱，则低频调制分量倾向于在AFPC环路中引起相位抖动。这是由于载波频率附近的调制边带的不对称性。为了减少这种相位抖动，在AFPC检测器之前引入滤波器，以减少包括导频载波信号的窄频带中信道响应的不对称性。

85. 发明授权

US06621527B1 Digital receiver with match filter responsive to field synchronization code in the final I-F signal envelope 失效
标题翻译：具有匹配滤波器的数字接收器响应于最终I-F信号包络中的场同步码
公开(公告)号：US06621527B1
公开(公告)日：2003-09-16
申请号：US09229606
申请日：1999-01-13
申请人： Allen LeRoy Limberg , Jung-Wan Ko
发明人： Allen LeRoy Limberg , Jung-Wan Ko
IPC分类号： H04N5446
CPC分类号： H04N5/08 , H04L27/02 , H04N5/4401
摘要： A radio receiver for receiving a selected digital TV signal uses final intermediate frequency signals the carrier frequencies of which are multiples of symbol rate. The radio receiver has a match filter receptive of rectified samples of digitized intermediate-frequency signal and responsive to the amplitude of the intermediate-frequency carrier being modulated in accordance with the field synchronization code group to generate a pulsed response to the beginning of each data field. This pulsed response is used to determine when data segment synchronization information should occur, so its detection is more certain to be accurate and data segment synchronization is more rapidly determined. Symbol synchronization is rapidly inferred from the field synchronization and data segment synchronization, so that the samples in each data line can be counted. The complex carrier frequencies of the final intermediate frequency signals are generated in response to the samples per data line count, for implementing synchronous detection to baseband. The adjustment of the carrier frequency of the final intermediate frequency signal to be a prescribed multiple of symbol rate is done in response to an automatic-frequency-and-phase-control signal developed from the synchronous detection results.
摘要翻译：用于接收所选择的数字TV信号的无线电接收机使用其载波频率是符号速率倍数的最终中频信号。无线电接收机具有接收经数字化的中频信号的整流样本的匹配滤波器，并且响应于根据场同步码组调制的中频载波的振幅，以产生对每个数据字段的开始的脉冲响应。这种脉冲响应用于确定何时发生数据段同步信息，因此其检测更确定是准确的，并且数据段同步被更快速地确定。符号同步可以从场同步和数据段同步快速推断出来，从而可以对每条数据行中的样本进行计数。响应于每个数据线计数的采样产生最终中频信号的复载波频率，以实现对基带的同步检测。响应于从同步检测结果产生的自动频率相位控制信号，将最终中频信号的载波频率调整为符号率的规定倍数。

86. 发明授权

US06545728B1 Digital television receivers that digitize final I-F signals resulting from triple-conversion 失效
标题翻译：数字电视接收机，将三重转换产生的最终I-F信号数字化
公开(公告)号：US06545728B1
公开(公告)日：2003-04-08
申请号：US09294304
申请日：1999-04-14
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H04N544
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04L1/0054 , H04L1/006 , H04L27/02 , H04N5/4401 , H04N5/455 , H04N5/46
摘要： Receiving apparatus for digital television signals digitizes a final intermediate frequency signal supplied from a triple-conversion radio receiver and synchrodynes the digitized final intermediate frequency signal to baseband. The triple-conversion radio receiver selects one of a plurality of digital television signals for upconversion to that portion of the electromagnetic frequency spectrum above the channels that are used for television broadcasting, amplifies a first intermediate-frequency signal in a first intermediate frequency band generated by that upconversion, amplifies a second intermediate-frequency signal in a second intermediate frequency band generated by downconverting the amplified first intermediate-frequency signal, and supplies a third intermediate-frequency signal in a third intermediate frequency band generated by downconverting the amplified second intermediate-frequency signal. This third intermediate-frequency signal is the final intermediate-frequency signal supplied to the analog-to-digital converter for being linearly converted to a digitized third intermediate-frequency signal. Digital synchrodyning circuitry synchrodynes the digitized third intermediate-frequency signal to baseband and thereby generates at least a real component of digital baseband signal. Circuitry responsive to at least the real component of the digital baseband signal recovers a stream of digital data descriptive of the video and audio portions of television programming.
摘要翻译：用于数字电视信号的接收装置对从三重转换无线电接收机提供的最终中频信号进行数字化，并将数字化的最终中频信号同步到基带。三重转换无线电接收机选择多个数字电视信号中的一个用于上变频到用于电视广播的信道上方的电磁频谱的那部分，放大由第一中频频带产生的第一中频频带通过下变频放大的第一中频信号产生的第二中频带放大第二中频信号，并将第三中频信号提供在通过下变频放大的第二中频信号产生的第三中频带信号。该第三中频信号是提供给模数转换器的最终中频信号，用于线性转换为数字化的第三中频信号。数字同步电路将数字化的第三中频信号同步到基带，从而产生数字基带信号的至少一个实部分量。响应于至少数字基带信号的实际分量的电路恢复描述电视节目的视频和音频部分的数字数据流。

87. 发明授权

US06496229B1 TV receiver using read-only memory shared during VSB and QAM reception for synchrodyning I-F signal to baseband 有权
标题翻译： TV接收机使用在VSB和QAM接收期间共享的只读存储器将I-F信号同步到基带
公开(公告)号：US06496229B1
公开(公告)日：2002-12-17
申请号：US09285240
申请日：1999-04-02
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H04N544
CPC分类号： H04N21/4383 , H04N5/211 , H04N5/4401 , H04N5/4446 , H04N5/455 , H04N5/46
摘要： In a digital TV receiver a single digital complex multiplier is used for digitally synchrodyning digital intermediate-frequency signal to baseband both during the reception of VSB digital television signals and during the reception of QAM digital television signals. The component digital multipliers of the complex multiplier are provided by read-only memories (ROMs). The complex digital carriers used by the complex multiplier are supplied from further read-only memory storing sine/cosine look-up tables for the QAM carrier and for the VSB carrier as,translated to the final intermediate-frequency band. This further read-only memory is addressed by a sample count and an indication of whether VSB or QAM digital television signal is currently being received.
摘要翻译：在数字电视接收机中，在接收VSB数字电视信号期间和接收QAM数字电视信号期间，单个数字复数乘法器用于将数字中频信号数字同步到基带。复数乘法器的分量数字乘法器由只读存储器（ROM）提供。由复数乘法器使用的复数数字载波从存储正弦/余弦查询表的另外的只读存储器提供，用于QAM载波和VSB载波，转换为最终的中频频带。该另外的只读存储器通过采样计数和当前正在接收VSB或QAM数字电视信号的指示来寻址。

88. 发明授权

US06480236B1 Envelope detection of PN sequences accompanying VSB signal to control operation of QAM/VSB DTV receiver 有权
标题翻译：信号检测伴随VSB信号的PN序列控制QAM / VSB DTV接收机的操作
公开(公告)号：US06480236B1
公开(公告)日：2002-11-12
申请号：US09285241
申请日：1999-04-02
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H04N544
CPC分类号： H04N21/4383 , H04L27/0008 , H04N5/211 , H04N5/4401 , H04N5/4446 , H04N5/445 , H04N5/46 , H04N11/008
摘要： The data field synchronization segment as symbol coded for VSB transmission comprises pseudo-random noise (PN) sequence information that can be detected in a QAM/VSB DTV signal receiver using an envelope detector responsive to final intermediate-frequency signal and a match filter for responsive to the PN sequence information appearing in the envelope detector response. The envelope detector response to QAM transmission does not contain the PN sequence information detected by the match filter. A threshold detector is used for determining whether the match filter response is of sufficient energy to indicate occurrence in a received DTV signal of the PN sequence information in the data field synchronization segment of a VSB DTV transmission. Timed latch circuitry is used for latching the indication for a period of time longer than at least one DTV data field. The QAM/VSB DTV signal receiver is operated either in a QAM reception mode or in a VSB reception mode, depending on the output signal of the timed latch circuitry.
摘要翻译：作为用于VSB传输的符号的数据字段同步段包括可以使用响应于最终中频信号的包络检测器在QAM / VSB DTV信号接收机中检测的伪随机噪声（PN）序列信息和用于响应的匹配滤波器涉及出现在包络检测器响应中的PN序列信息。对QAM传输的包络检测器响应不包含由匹配滤波器检测到的PN序列信息。阈值检测器用于确定匹配滤波器响应是否具有足够的能量以指示在VSB DTV传输的数据字段同步段中PN序列信息的接收DTV信号中的出现。定时锁存电路用于将指示锁存长于至少一个DTV数据字段的时间段。根据定时锁存电路的输出信号，QAM / VSB DTV信号接收器在QAM接收模式或VSB接收模式下工作。

89. 发明授权

US06449325B1 Circuitry operative on selected symbol slicing results for synchronizing data fields in a digital television receiver 有权
标题翻译：电路在对数字电视接收机中的数据字段进行同步的所选符号切片结果上进行操作
公开(公告)号：US06449325B1
公开(公告)日：2002-09-10
申请号：US09229603
申请日：1999-01-13
申请人： Allen LeRoy Limberg
发明人： Allen LeRoy Limberg
IPC分类号： H04N508
CPC分类号： H04N5/4401 , H04L25/03012 , H04L27/02 , H04L27/34 , H04L27/362 , H04L2025/03471 , H04N5/08 , H04N5/46
摘要： A digital television signal receiver includes a bin amplitude comparator for symbol decoding and match filtering to recover data synchronizing information from selected bin amplitude comparator responses generated during data slicing. The bin amplitude comparator concurrently supplies bin occupancy results for an amplitude slice including a value +S and for an amplitude slice including a value −S, which values +S and −S define the positive and negative excursions respectively of a binary data synchronization signal, current bin occupancy results being grouped together as two-parallel-bit serial input signal to a shift register clocked at symbol rate. Match filtering to detect data segment synchronization symbol code sequences is provided in accordance with an aspect of the invention by an AND gate supplied bits from selected storage locations in the shift register as wired input signals. In other match filtering performed in accordance with another aspect of the invention, a digital adder network receives bits from selected storage locations in the shift register as wired input signals, and a threshold detector responds to the summed bits exceeding a threshold value to detect data field synchronization symbol code sequences.
摘要翻译：数字电视信号接收机包括用于符号解码和匹配滤波的二进制振幅比较器，以从数据切片期间产生的选定的二进制振幅比较器响应中恢复数据同步信息。二进制振幅比较器同时提供包括值+ S的振幅片的块占有率结果，对于包括值-S的幅度片，其值+ S和-S分别定义二进制数据同步信号的正偏移和负偏移，当前存储区占用结果被组合在一起作为双并行位串行输入信号到以符号速率计时的移位寄存器。根据本发明的一个方面，根据本发明的一个方面提供匹配滤波以通过与门选择的提供的位从移位寄存器中的选定的存储位置提供为有线输入信号。在根据本发明的另一方面执行的其他匹配滤波中，数字加法器网络从移位寄存器中的选定存储位置接收位作为有线输入信号，并且阈值检测器响应超过阈值的相加比特以检测数据字段同步符号代码序列。

90. 发明授权

US06441843B1 Suppression of effects of co-channel NTSC interference artifacts upon digital TV receiver adaptive equalizer 有权
标题翻译：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。

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