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    • 1. 再颁专利
    • Method and apparatus for filtering digital television signals
    • 数字电视信号滤波方法及装置
    • USRE42317E1
    • 2011-05-03
    • US11709931
    • 2007-02-22
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HerseyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HerseyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • H04N5/213
    • H04N5/211Y10S348/914
    • A system for filtering digital television signals is provided. The system comprises a generator for providing a first data sequence to a private data packetizer, and a transmitter for transmitting the packetized first data sequence in a data channel of a digital television signal. The system further includes a receiver for receiving the digital television signal and recovering the first data sequence. The receiver includes a channel estimator for providing an estimate of channel characteristics, such as estimated channel impulse estimate and estimated noise variance. The receiver further includes an adaptive equalizer filter having an input for receiving the digital television signal and an input for receiving adaptive filter coefficients. The receiver further includes a coefficient processor for calculating adaptive filter coefficients based on the channel estimate, and providing the adaptive filter coefficients to the adaptive equalizer filter. The digital television signal is thus filtered to remove undesired channel effects.
    • 提供了一种用于过滤数字电视信号的系统。 该系统包括用于向专用数据分组器提供第一数据序列的发生器和用于在数字电视信号的数据信道中发送分组化的第一数据序列的发射机。 该系统还包括用于接收数字电视信号并恢复第一数据序列的接收机。 接收机包括用于提供信道特性的估计的信道估计器,例如估计的信道脉冲估计和估计的噪声方差。 接收机还包括具有用于接收数字电视信号的输入端和用于接收自适应滤波器系数的输入端的自适应均衡器滤波器。 接收机还包括系数处理器,用于基于信道估计来计算自适应滤波器系数,并将自适应滤波器系数提供给自适应均衡器滤波器。 因此数字电视信号被滤波以去除不需要的信道效应。
    • 3. 发明授权
    • Method and apparatus for filtering digital television signals
    • 数字电视信号滤波方法和装置
    • US6122015A
    • 2000-09-19
    • US206409
    • 1998-12-07
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • Naofal Mohammed Wassel Al-DhahirJohn Erik HersheyNick Andrew Van StralenRichard Louis FreyMark Lewis Grabb
    • H04N5/21H04N5/213
    • H04N5/211Y10S348/914
    • A system for filtering digital television signals is provided. The system comprises a generator for providing a first data sequence to a private data packetizer, and a transmitter for transmitting the packetized first data sequence in a data channel of a digital television signal. The system further includes a receiver for receiving the digital television signal and recovering the first data sequence. The receiver includes a channel estimator for providing an estimate of channel characteristics, such as estimated channel impulse estimate and estimated noise variance. The receiver further includes an adaptive equalizer filter having an input for receiving the digital television signal and an input for receiving adaptive filter coefficients. The receiver further includes a coefficient processor for calculating adaptive filter coefficients based on the channel estimate, and providing the adaptive filter coefficients to the adaptive equalizer filter. The digital television signal is thus filtered to remove undesired channel effects.
    • 提供了一种用于过滤数字电视信号的系统。 该系统包括用于向专用数据分组器提供第一数据序列的发生器和用于在数字电视信号的数据信道中发送分组化的第一数据序列的发射机。 该系统还包括用于接收数字电视信号并恢复第一数据序列的接收机。 接收机包括用于提供信道特性的估计的信道估计器,例如估计的信道脉冲估计和估计的噪声方差。 接收机还包括具有用于接收数字电视信号的输入端和用于接收自适应滤波器系数的输入端的自适应均衡器滤波器。 接收机还包括系数处理器,用于基于信道估计来计算自适应滤波器系数,并将自适应滤波器系数提供给自适应均衡器滤波器。 因此数字电视信号被滤波以去除不需要的信道效应。
    • 5. 发明授权
    • Channel decoder using vocoder joint statistics
    • 频道解码器使用声码器联合统计
    • US06393072B1
    • 2002-05-21
    • US09340102
    • 1999-06-25
    • John Anderson Fergus RossNick Andrew Van StralenMark Lewis GrabbSteven Robert KochRichard Louis Zinser, Jr.John Bailey Anderson
    • John Anderson Fergus RossNick Andrew Van StralenMark Lewis GrabbSteven Robert KochRichard Louis Zinser, Jr.John Bailey Anderson
    • H04L2706
    • H04L1/0047H04L25/061H04L25/067
    • A method for decoding (voice)data where the data is encoded by a finite-state data encoder (216) for transmission over a data channel (18), includes the step of procuring a table of joint statistics representing the probability of occurrence, in a frame of source data of each of the bits of the frame. The joint statistics may be determined ahead of time. The method includes the step of calculating intermediate gamma signals in response to the decoded data of the preceding frame and the joint statistics. The joint statistics source distribution signals represent the likelihood that, for a given logic level of the preceding bit, the “current” bit takes on a particular state; for uncorrelated bits, this value is 0.5. State probability signals and transition probability signals are generated from the gamma signals. The state probability and transition probability signals are processed to produce bit probability signals indicative of the probability that the current bit is in a given state, from which hard bit decisions can be made.
    • 一种用于解码(语音)数据的方法,其中数据由有限状态数据编码器(216)编码,用于通过数据信道(18)进行传输,包括以下步骤:采购表示发生概率的联合统计表, 帧的每个比特的源数据帧。 联合统计可以提前确定。 该方法包括响应于前一帧的解码数据和联合统计来计算中间伽马信号的步骤。 联合统计源分布信号表示对于前一比特的给定逻辑电平,“当前”比特处于特定状态的可能性; 对于不相关的位,此值为0.5。 从伽马信号产生状态概率信号和转移概率信号。 处理状态概率和转移概率信号以产生指示当前比特处于给定状态的概率的比特概率信号,从中可以进行硬比特决定。
    • 8. 发明授权
    • Use of wideband DTV overlay signals for brevity signaling and public safety
    • 使用宽带数字电视覆盖信号进行简洁信号和公共安全
    • US06498627B1
    • 2002-12-24
    • US09422441
    • 1999-10-21
    • John Erik HersheyMark Lewis GrabbKenneth Brakeley Welles, II
    • John Erik HersheyMark Lewis GrabbKenneth Brakeley Welles, II
    • H04N521
    • H04N21/8146H04L27/28H04N5/211H04N5/44508H04N7/08H04N21/4432H04N21/478H04N21/814
    • A brevity signaling module for a digital television (DTV) receiver enables the reception of emergency broadcast messages. The overlay signal received at the receiver front end is squared in a squaring loop, producing spectral lines at DC and twice the overlay signal frequency, or 2&ohgr;, where &ohgr;=2&pgr;f and f is the center frequency of the overlay signal. The squared signal is passed through a narrow band filter having a bandwidth sufficient to pass a spectrum containing a plurality of tones 2&ohgr;, 2&ohgr;1, 2&ohgr;2, . . . , 2&ohgr;n, where 2&ohgr;1, 22, . . . , 2&ohgr;n are different frequency tones assigned to different auxiliary functions. The detected tone is used by a control module to determine whether normal multipath processing should be performed or whether this processing should be suppressed and auxiliary functions performed, including turning on the DTV receiver power in order that an emergency broadcast message might be conveyed to persons in the vicinity of the DTV receiver.
    • 用于数字电视(DTV)接收机的简洁信号模块能够接收紧急广播消息。 在接收机前端接收的覆盖信号在平方环中平方,产生DC和两倍叠加信号频率的频谱线,或2omega,其中ω= 2pif,f是叠加信号的中心频率。 平方信号通过具有足以通过包含多个音调2omega,2omega1,2omega2的频谱的带宽的窄带滤波器。 。 。 ,2omegan,其中2omega1,22。 。 。 ,2omegan是分配给不同辅助功能的不同频率音调。 检测到的音调由控制模块用于确定是否应执行正常的多路径处理,还是应该抑制该处理和执行辅助功能,包括接通DTV接收机的功率,以便将紧急广播消息传送给 DTV接收机附近。