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公开(公告)号：US07161613B2
公开(公告)日：2007-01-09
申请号：US10826491
申请日：2004-04-16
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
IPC分类号： H04N5/38
CPC分类号： H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/46 , H04N11/002
摘要： An electronic, programmable filter is disclosed which selectively removes interference, noise or distortion components from a frequency band without perturbing any of the other signals of the band. An input frequency band such as a television channel spectrum is initially demodulated to baseband and applied to the input of the filter. The baseband spectrum is combined in a complex mixer with a synthesized frequency signal that shifts the spectrum a characteristic amount, in the frequency domain, so as to position an interference component in the region about DC. Once shifted, the frequency components about DC are removed by DC canceler circuit and the resulting spectrum is mixed with a subsequent synthesized frequency signal which shifts the spectrum back to its original representation and baseband. The frequency signals are developed by a programmable frequency synthesizer which a user may program with an intelligence signal that defines the frequency location of an interference signal within the spectrum. Filter blocks may be added or subtracted in order to optimize the filter response for any number of interference components for which rejection is desired.
摘要翻译： 公开了一种电子可编程滤波器，其选择性地从频带中去除干扰，噪声或失真分量，而不扰乱频带的任何其它信号。 诸如电视频道频谱的输入频带最初被解调为基带并且被应用于滤波器的输入。 基带频谱在复合混频器中与合成频率信号组合，该频率信号在频域中将频谱偏移特征量，以便在DC周围的区域中定位干扰分量。 一旦移位，DC直流的频率分量被直流消除器电路去除，所得到的频谱与随后的合成频率信号混合，后者将频谱转移回原来的表示和基带。 频率信号由可编程频率合成器开发，用户可以使用定义频谱内的干扰信号的频率位置的智能信号进行编程。 可以添加或减少滤波器块以优化对于期望的抑制的任何数量的干扰分量的滤波器响应。
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公开(公告)号：US06611568B2
公开(公告)日：2003-08-26
申请号：US10116975
申请日：2002-04-05
IPC分类号： H04L2720
CPC分类号： H04L27/362
摘要： Clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO and are passed from the FIFO at a second (or intermediate) frequency controlled by a numerically controlled oscillator. To regulate the frequency of the signals from the numerically controlled oscillator, the phases of the clock signals at the variable frequency are compared in a phase detector with the phases of the signals from the numerically controlled oscillator to generate an error signal. The error signals and the signals at a fixed sampling frequency higher than the intermediate frequency regulate the frequency of the signals from the numerically controlled oscillator and thus the frequency of the digital data signals from the FIFO. The digital data signals from the FIFO are converted to a pair of signals at the second frequency. The pair of signals at the second frequency have individual ones of a plurality of analog levels dependent upon a code indicated by successive pairs of the digital data signals. The signals at the second (or intermediate) frequency modulate a pair of trigonometrically related signals at the fixed sampling frequency. The modulated signals at the fixed sampling frequency are combined and the combined signals are sampled at the fixed sampling frequency to corresponding analog values by a digital-to-analog converter.
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公开(公告)号：US06727936B2
公开(公告)日：2004-04-27
申请号：US10004515
申请日：2001-11-02
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
IPC分类号： H04N538
CPC分类号： H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/46 , H04N11/002
摘要： An electronic, programmable filter is disclosed which selectively removes interference, noise or distortion components from a frequency band without perturbing any of the other signals of the band. An input frequency band such as a television channel spectrum is initially demodulated to baseband and applied to the input of the filter. The baseband spectrum is combined in a complex mixer with a synthesized frequency signal that shifts the spectrum a characteristic amount, in the frequency domain, so as to position an interference component in the region about DC. Once shifted, the frequency components about DC are removed by DC canceler circuit and the resulting spectrum is mixed with a subsequent synthesized frequency signal which shifts the spectrum back to its original representation and baseband. The frequency signals are developed by a programmable frequency synthesizer which a user may program with an intelligence signal that defines the frequency location of an interference signal within the spectrum. Filter blocks may be added or subtracted in order to optimize the filter response for any number of interference components for which rejection is desired.
摘要翻译： 公开了一种电子可编程滤波器，其选择性地从频带中去除干扰，噪声或失真分量，而不扰乱频带的任何其它信号。 诸如电视频道频谱的输入频带最初被解调为基带并且被应用于滤波器的输入。 基带频谱在复合混频器中与合成频率信号组合，该频率信号在频域中使频谱偏移特征量，以便在DC周围的区域中定位干扰分量。 一旦移位，DC直流的频率分量被直流消除器电路去除，所得到的频谱与随后的合成频率信号混合，后者将频谱转移回原来的表示和基带。 频率信号由可编程频率合成器开发，用户可以使用定义频谱内的干扰信号的频率位置的智能信号进行编程。 可以添加或减少滤波器块以优化对于期望的抑制的任何数量的干扰分量的滤波器响应。
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公开(公告)号：US06421396B1
公开(公告)日：2002-07-16
申请号：US08843518
申请日：1997-04-16
IPC分类号： H04L2720
CPC分类号： H04L27/362
摘要： Clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO and are passed from the FIFO at a second (or intermediate) frequency controlled by a numerically controlled oscillator. To regulate the frequency of the signals from the numerically controlled oscillator, the phases of the clock signals at the variable frequency are compared in a phase detector with the phases of the signals from the numerically controlled oscillator to generate an error signal. The error signals and the signals at a fixed sampling frequency higher than the intermediate frequency regulate the frequency of the signals from the numerically controlled oscillator and thus the frequency of the digital data signals from the FIFO. The digital data signals from the FIFO are converted to a pair of signals at the second frequency. The pair of signals at the second frequency have individual ones of a plurality of analog levels dependent upon a code indicated by successive pairs of the digital data signals. The signals at the second (or intermediate) frequency modulate a pair of trigonometrically related signals at the fixed sampling frequency. The modulated signals at the fixed sampling frequency are combined and the combined signals are sampled at the fixed sampling frequency to corresponding analog values by a digital-to-analog converter.
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公开(公告)号：US06344871B1
公开(公告)日：2002-02-05
申请号：US09685476
申请日：2000-10-10
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
IPC分类号： H04N538
CPC分类号： H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/46 , H04N11/002
摘要： An electronic, programmable filter is disclosed which selectively removes interference, noise or distortion components from a frequency band without perturbing any of the other signals of the band. An input frequency band such as a television channel spectrum is initially demodulated to baseband and applied to the input of the filter. The baseband spectrum is combined in a complex mixer with a synthesized frequency signal that shifts the spectrum a characteristic amount, in the frequency domain, so as to position an interference component in the region about DC. Once shifted, the frequency components about DC are removed by DC canceler circuit and the resulting spectrum is mixed with a subsequent synthesized frequency signal which shifts the spectrum back to its original representation and baseband. The frequency signals are developed by a programmable frequency synthesizer which a user may program with an intelligence signal that defines the frequency location of an interference signal within the spectrum. Filter blocks may be added or subtracted in order to optimize the filter response for any number of interference components for which rejection is desired.
摘要翻译： 公开了一种电子可编程滤波器，其选择性地从频带中去除干扰，噪声或失真分量，而不扰乱频带的任何其它信号。 诸如电视频道频谱的输入频带最初被解调为基带并且被应用于滤波器的输入。 基带频谱在复合混频器中与合成频率信号组合，该频率信号在频域中使频谱偏移特征量，以便在DC周围的区域中定位干扰分量。 一旦移位，DC直流的频率分量被直流消除器电路去除，所得到的频谱与随后的合成频率信号混合，后者将频谱转移回原来的表示和基带。 频率信号由可编程频率合成器开发，用户可以使用定义频谱内的干扰信号的频率位置的智能信号进行编程。 可以添加或减少滤波器块以优化对于期望的抑制的任何数量的干扰分量的滤波器响应。
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公开(公告)号：US06219088B1
公开(公告)日：2001-04-17
申请号：US09303783
申请日：1999-04-30
申请人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
发明人： Tian-Min Liu , Loke Kun Tan , Steven T. Jaffe , Robert A. Hawley
IPC分类号： H04N538
CPC分类号： H04B1/68 , H04L25/03057 , H04L27/02 , H04L27/066 , H04L27/2273 , H04L27/3427 , H04L27/3827 , H04L2025/03382 , H04L2025/0342 , H04L2025/0349 , H04L2025/03503 , H04L2027/0032 , H04L2027/0042 , H04L2027/0057 , H04L2027/0067 , H04L2027/0087 , H04N5/21 , H04N5/211 , H04N5/44 , H04N5/4401 , H04N5/46 , H04N11/002
摘要： An electronic, programmable filter is disclosed which selectively removes interference, noise or distortion components from a frequency band without perturbing any of the other signals of the band. An input frequency band such as a television channel spectrum is initially demodulated to baseband and applied to the input of the filter. The baseband spectrum is combined in a complex mixer with a synthesized frequency signal that shifts the spectrum a characteristic amount, in the frequency domain, so as to position an interference component in the region about DC. Once shifted, the frequency components about DC are removed by DC canceler circuit and the resulting spectrum is mixed with a subsequent synthesized frequency signal which shifts the spectrum back to its original representation and baseband. The frequency signals are developed by a programmable frequency synthesizer which a user may program with an intelligence signal that defines the frequency location of an interference signal within the spectrum. Filter blocks may be added or subtracted in order to optimize the filter response for any number of interference components for which rejection is desired.
摘要翻译： 公开了一种电子可编程滤波器，其选择性地从频带中去除干扰，噪声或失真分量，而不扰乱频带的任何其它信号。 诸如电视频道频谱的输入频带最初被解调为基带并且被应用于滤波器的输入。 基带频谱在复合混频器中与合成频率信号组合，该频率信号在频域中将频谱偏移特征量，以便在DC周围的区域中定位干扰分量。 一旦移位，DC直流的频率分量被直流消除器电路去除，所得到的频谱与随后的合成频率信号混合，后者将频谱转移回原来的表示和基带。 频率信号由可编程频率合成器开发，用户可以使用定义频谱内的干扰信号的频率位置的智能信号进行编程。 可以添加或减少滤波器块以优化对于期望的抑制的任何数量的干扰分量的滤波器响应。
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公开(公告)号：US06870429B2
公开(公告)日：2005-03-22
申请号：US10603362
申请日：2003-06-25
CPC分类号： H04L27/362
摘要： Clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO and are passed from the FIFO at a second (or intermediate) frequency controlled by a numerically controlled oscillator. To regulate the frequency of the signals from the numerically controlled oscillator, the phases of the clock signals at the variable frequency are compared in a phase detector with the phases of the signals from the numerically controlled oscillator to generate an error signal. The error signals and the signals at a fixed sampling frequency higher than the intermediate frequency regulate the frequency of the signals from the numerically controlled oscillator and thus the frequency of the digital data signals from the FIFO. The digital data signals from the FIFO are converted to a pair of signals at the second frequency. The pair of signals at the second frequency have individual ones of a plurality of analog levels dependent upon a code indicated by successive pairs of the digital data signals. The signals at the second (or intermediate) frequency modulate a pair of trigonometrically related signals at the fixed sampling frequency. The modulated signals at the fixed sampling frequency are combined and the combined signals are sampled at the fixed sampling frequency to corresponding analog values by a digital-to-analog converter.
摘要翻译： 可变频率的时钟信号和数字数据信号被引入到FIFO的输入端，并且以由数控振荡器控制的第二（或中间）频率从FIFO传送。 为了调节来自数控振荡器的信号的频率，将可变频率的时钟信号的相位在相位检测器中与来自数控振荡器的信号的相位进行比较，以产生误差信号。 误差信号和高于中频的固定采样频率的信号调节来自数控振荡器的信号的频率，从而调节来自FIFO的数字数据信号的频率。 来自FIFO的数字数据信号被转换成第二频率的一对信号。 在第二频率处的这对信号具有多个模拟电平中的单独的信号，这取决于连续的数字数据信号对所指示的代码。 第二（或中间）频率处的信号以固定采样频率调制一对三角相关信号。 将固定采样频率的调制信号合并，并将组合信号以固定采样频率采样到数模转换器对应的模拟值。
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