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1. 发明授权

US5196851A Linearizing non-linear analog-to-digital process and circuit 失效
标题翻译：线性化非线性模拟数字到数字处理和电路
公开(公告)号：US5196851A
公开(公告)日：1993-03-23
申请号：US704986
申请日：1991-05-24
申请人： Chandrakant B. Patel , Thomas Meyer
发明人： Chandrakant B. Patel , Thomas Meyer
IPC分类号： H03M1/10 , H03M1/12
CPC分类号： H03M1/1042 , H03M1/12
摘要： A circuit for linearizing analog-to-digital output is shown in FIG. 2, with an analog signal V.sub.i transmitted by input circuit 10 is applied to an input port of an analog-to-digital converter 12 controlled by a sampling signal V.sub.s, to provide digital data V.sub.d on an "N" bit data bus 14. An analog-to-digital linearizing memory 16 storing a look-up table of digital values, is coupled to bus 14 to receive the digital data V.sub.d, and to respond to the digital data V.sub.d by providing true linear digital values from the look-up table to digital data processing system DSP 20 via an "N" bit data bus 18. A microprocessor 22 is temporarily coupled between the output port of converter 12 and the input port of memory 16 via bus 14, to serve as a switch between bus 14 and a programming memory 24 containing a table of true linear digital values V.sub.t. A known test signal is applied to input circuit 10, and true linear digital values V.sub.t stored in programming memory 24, are then read into linearizing memory 16 to provide an accurate and reliable relation to a characteristic such as the amplitude of each step of the known test signal over the entire range of the known test signal.

2. 再颁专利

USRE38456E1 Decimation of baseband DTV signals prior to channel equalization in digital television signal receivers 失效
标题翻译：在数字电视信号接收机的信道均衡之前抽取基带DTV信号
公开(公告)号：USRE38456E1
公开(公告)日：2004-03-09
申请号：US09973825
申请日：2001-10-11
申请人： Chandrakant B. Patel , Allen LeRoy Limberg
发明人： Chandrakant B. Patel , Allen LeRoy Limberg
IPC分类号： H04N5455
CPC分类号： H04N5/4446 , H03D1/24 , H03D5/00 , H04B1/28 , H04L1/0054 , H04L1/0071 , H04N5/4401 , H04N5/455
摘要： A radio receiver uses the same tuner for receiving a selected digital television (DTV) signal, irrespective of whether it is a quadrature-amplitude-modulation (QAM) or a vestigial sideband (VSB) signal. The final IF signal is digitized at a rate that is a multiple of both the symbol frequencies of the QAM and VSB signals, for synchrodyning to baseband. The carrier frequencies of the QAM and VSB final IF signals are regulated to be submultiples of the multiple of both the symbol frequencies of the QAM and VSB signals by applying automatic frequency and phase control (AFPC) signals developed in the digital circuitry to a local oscillator of the tuner. Baseband DTV signals obtained by synchrodyning the final IF signals have a sample rate higher than symbol rate to facilitate symbol synchronization. The baseband DTV signals are decimated to symbol rate before performing channel equalization to reduce the number of multipliers required in the channel equalization filter.

3. 发明授权

US06535553B1 Passband equalizers with filter coefficients calculated from modulated carrier signals 有权
标题翻译：通过调制载波信号计算滤波器系数的通带均衡器
公开(公告)号：US06535553B1
公开(公告)日：2003-03-18
申请号：US09335514
申请日：1999-06-18
申请人： Allen LeRoy Limberg , Chandrakant B. Patel
发明人： Allen LeRoy Limberg , Chandrakant B. Patel
IPC分类号： H03H730
CPC分类号： H04L27/01
摘要： A digital communications radio receiver, as for television, digitizes a final intermediate-frequency signal offset from zero frequency no more than a few megahertz. This digitized final I-F signal is passed through an adaptive equalizer before being synchrodyned to baseband in the digital regime, which adaptive equalizer has its weighting coefficients determined by comparing I-F signal as received with possible multipath with ideal I-F signal free from multipath distortion. Decision feedback for adjusting the filtering coefficients of the equalizer is described, which is based on the ideal baseband signal being re-modulated onto final I-F carrier and compared to the received signal as translated in frequency to provide the final I-F signal. A training-signal method for adjusting the filtering coefficients of the equalizer is described, which characterizes the reception channel by comparing prescribed portions of the received signal as translated in frequency to provide the final I-F signal to final I-F signal segments stored at the receiver. Equalization of the final I-F signal based on error signals derived from modulated I-F signal, rather than from demodulated baseband signal, allows different equalization of the upper sideband and the lower sideband of the final I-F signal. This facilitates receiver passband tilts as well as multipath distortion being compensated for.
摘要翻译：数字通信无线电接收机，对于电视机，将最终的中频信号偏移从零频率数字化，不超过几兆赫兹。该数字化的最终I-F信号在与数字方式中的基带同步到基带之前通过自适应均衡器，该自适应均衡器通过将接收到的I-F信号与可能的多路径与没有多径失真的理想I-F信号进行比较来确定其加权系数。描述了用于调整均衡器的滤波系数的判决反馈，其基于将理想基带信号重新调制到最终的I-F载波上并与接收的信号进行频率比较，以提供最终的I-F信号。描述了用于调整均衡器的滤波系数的训练信号方法，其通过比较频率转换的接收信号的规定部分来表征接收信道，以将最终I-F信号提供给存储在接收机处的最终I-F信号段。基于从调制的I-F信号而不是从解调的基带信号导出的误差信号的最终I-F信号的均衡允许最终I-F信号的上边带和下边带的不同均衡。这有助于接收机通带倾斜以及补偿的多径失真。

4. 发明授权

US06313885B1 DTV receiver with baseband equalization filters for QAM signal and for VSB signal which employ common elements 有权
标题翻译：具有用于QAM信号的基带均衡滤波器和采用公共元件的VSB信号的DTV接收机
公开(公告)号：US06313885B1
公开(公告)日：2001-11-06
申请号：US09440132
申请日：1999-11-15
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： H04N21/4383 , H04L1/0045 , H04L27/0008 , H04N5/211 , H04N5/4401 , H04N5/4446 , H04N5/445 , H04N5/455 , H04N5/46
摘要： During the reception of VSB DTV signal, the channel equalizer for a QAM/VSB DTV signal receiver the equalizer is operated to equalize only the real sample stream of VSB symbol code, rather than being operated as a complex equalizer. During the reception of QAM DTV signal, the real sample stream of QAM symbol code and the imaginary sample stream of QAM symbol code are time-division-multiplexed together on an alternate sample basis to generate input signal for the channel equalizer, which is operated as a dual-phase filter. After equalization, the time-division-multiplexed real and imaginary samples of QAM symbol code are de-multiplexed to recover parallel real and imaginary sample streams of QAM symbol code that are independent of each other, but have been subjected to similar equalization. Supposing that the QAM DTV symbol code rate is half the VSB DTV symbol code rate, the minimum sampling rate for operation of the channel equalizer is the same for both types of symbol code.
摘要翻译：在接收VSB DTV信号期间，对于QAM / VSB DTV信号接收机的信道均衡器，均衡器被操作以均衡VSB符号码的实际样本流，而不是作为复均衡器来操作。在QAM DTV信号的接收期间，QAM符号码的实际采样流和QAM符号码的虚数采样流在交替采样的基础上被一起进行时分复用，以生成用于信道均衡器的输入信号，该输入信号作为一个双相滤波器。在均衡之后，将QAM符号码的时分多路复用实数和样本解复用，以恢复彼此独立但已进行类似均衡的QAM符号码的并行实数和虚数采样流。假设QAM DTV符号码率是VSB DTV符号码率的一半，则对于两种类型的符号码，信道均衡器的操作的最小采样率是相同的。

5. 发明授权

US6134373A System for recording and reproducing a wide bandwidth video signal via a narrow bandwidth medium 失效
标题翻译：用于通过窄带宽媒体记录和再现宽带宽视频信号的系统
公开(公告)号：US6134373A
公开(公告)日：2000-10-17
申请号：US787690
申请日：1991-11-04
申请人： Christopher H. Strolle , Chandrakant B. Patel , Werner F. Wedam , Jung Wan Ko , Raymond Schnitzler , Jong Kyung Yun
发明人： Christopher H. Strolle , Chandrakant B. Patel , Werner F. Wedam , Jung Wan Ko , Raymond Schnitzler , Jong Kyung Yun
IPC分类号： H04N5/93 , H04N9/78 , H04N9/797 , H04N9/80 , H04N9/82 , H04N9/83 , H04N9/835 , H04N9/84 , H04N9/898 , H04N9/79
CPC分类号： H04N9/831 , H04N9/797 , H04N9/7976 , H04N9/80 , H04N9/8205 , H04N9/835 , H04N9/84 , H04N9/898
摘要： An encoder separates luminance and chrominance signal components of a composite video signal. The frame-to-frame changes in the luminance signal are detected, and a motion signal is derived therefrom. The higher frequency portion of the luminance signal is adaptively de-emphasized in amplitude and folded into the spectrum of the lower frequency portion of the luminance signal, to generate a folded-spectrum luminance signal for modulating the frequency of a luma carrier. In a combined signal, suitable for magnetic recording in accordance with a modified VHS standard, the chrominance signal is translated in frequency to generate a color-under signal in a frequency band below that occupied by the FM luma carrier. The de-emphasized higher frequency portion of the luminance signal, as folded into its lower frequency portion, and encoding of the motion signal onto vacant portions of the frequency band below that occupied by the FM luma carrier in such a magnetic recording facilitate its being compatibly reproduced by conventional VHS reproduction devices. In a wideband reproduction device a decoder demodulates the folded-spectrum luminance signal from the FM luma carrier, unfolds the lumininance signal, and reemphasizes the high frequencies of the unfolded luminance signal. The color-under signal is translated in frequency to regenerate chrominance signal combined with the unfolded luminance signal with its high frequencies re-emphasized to their original amplitude, regenerating a composite signal descriptive of a full bandwidth image. The motion signal is utilized in the encoder for motion-adaptively pre-filtering the input luminance and is recovered in the decoder for motion-adaptively post-filtering the unfolded luminance.
摘要翻译：编码器分离复合视频信号的亮度和色度信号分量。检测亮度信号中的帧到帧的变化，并从中导出运动信号。亮度信号的较高频率部分在幅度上自适应去强调，并折射成亮度信号的较低频率部分的频谱，以产生用于调制亮度载波频率的折射谱亮度信号。在适合于根据修改的VHS标准的磁记录的组合信号中，色度信号被频率转换，以在低于由FM亮度载波占据的频带内产生下色信号。亮度信号的去加重的较高频率部分被折叠成其较低频率部分，并且将运动信号编码到在这种磁记录中由FM亮度载波占据的频带以下的频带的空的部分上，便于其兼容由常规VHS再现设备再现。在宽带再现装置中，解码器解调来自FM亮度载波的折叠频谱亮度信号，展开亮度信号，并重新强调展开的亮度信号的高频。彩色信号以频率转换以再现与展开的亮度信号组合的色度信号，其高频被再次强调到其原始幅度，再生描述全带宽图像的复合信号。运动信号在编码器中用于对输入亮度进行运动自适应预滤波，并在解码器中恢复运动自适应地对展开后的亮度进行后置滤波。

6. 发明授权

US6123266A Cooling system for stand-alone battery cabinets 失效
标题翻译：独立电池柜冷却系统
公开(公告)号：US6123266A
公开(公告)日：2000-09-26
申请号：US892255
申请日：1997-07-11
申请人： Gary Dean Bainbridge , Carla Betro , Mayankkumar M. Dixit , Quang Duong , Mahesh B. Mistry , Stephen John Palaszewski , Chandrakant B. Patel
发明人： Gary Dean Bainbridge , Carla Betro , Mayankkumar M. Dixit , Quang Duong , Mahesh B. Mistry , Stephen John Palaszewski , Chandrakant B. Patel
IPC分类号： H01M2/10 , H01M10/50 , H05K7/20 , F25D23/12
CPC分类号： H05K7/20572 , H01M10/5004 , H01M10/5018 , H01M10/5022 , H01M10/5024 , H01M10/5067 , H01M10/5073 , H01M10/5087 , H01M2/1077
摘要： An outdoor battery cabinet is formed to include a cooling system to extend the life of the housed batteries. The cooling system comprises a ventilation system including an air intake unit, an exhaust unit and a thermostat control. The interior surface of the cabinet is covered with a layer of insulative material. The ventilation system is configured to turn "on" when the outdoor temperature drops below the interior cabinet temperature, thereby cooling the housed batteries. Once the outdoor temperature rises above the cabinet temperature, the ventilation system is turned "off" and the insulation in the cabinet functions to maintain the cooler ambient temperature within the cabinet. To minimize the effects of wind forcing air through the ventilation openings, the intake and exhaust louvers are located on the same side of the cabinet.
摘要翻译：室外电池柜形成为包括冷却系统以延长所容纳的电池的寿命。冷却系统包括通风系统，其包括进气单元，排气单元和恒温器控制。机柜的内表面覆盖有一层绝缘材料。当室外温度低于室内温度时，通风系统配置为打开，从而冷却收纳的电池。一旦室外温度升高到机柜温度以上，通风系统就会关闭，机柜内部的绝缘层可以保持室内较冷的环境温度。为了最大限度地减少风吹过通风口的空气的影响，进气门和排气扇位于机柜的同一侧。

7. 发明授权

US5600380A Ghost-cancelation reference signal acquisition circuitry, as for TV receiver or video recorder 失效
标题翻译： Ghost-Cancellation参考信号采集电路，如电视接收机或录像机
公开(公告)号：US5600380A
公开(公告)日：1997-02-04
申请号：US228356
申请日：1994-04-15
申请人： Chandrakant B. Patel , Jian Yang
发明人： Chandrakant B. Patel , Jian Yang
IPC分类号： H04N5/44 , H04N5/21 , H04N5/213
CPC分类号： H04N5/211
摘要： A first composite video signal may include attendant ghosts and sometimes includes in a prescribed L.sup.th line of each field during the vertical blanking interval one of a cycle of M ghost-canceling reference (GCR) signals of prescribed magnitude and respective phasing. Filter circuitry generates a second composite video signal in response to the first composite video signal, which is adjusted in response to filter programming signals generated by a computer storing a ghost-free GCR signal. The computer receives a GCR signal with attendant ghosts and compares it to the stored ghost-free GCR signal, thereby carrying out correlation procedures for calculating the filter programming signals. The second composite video signal is a response to the first composite video signal in which the attendant ghosts are lessened. Synchronizing pulses are separated from the composite video signals and a scan line counter counts the horizontal synchronizing pulses, generating a line count, and is reset to an initial line count by each vertical synchronizing pulse. An L.sup.th -line separator responds to the line count for separating the scan lines of the second composite video signal that include GCR signals. A field counter counts the vertical synchronizing pulses modulo M, generating a field count synchronized to the cycle of M. GCR signals. A temporal filter combines M.times.N successive scan lines to generate a temporal filter response supplied to the computer as a noise-reduced GCR signal with attendant ghosts.
摘要翻译：第一复合视频信号可以包括伴随的重影，并且有时在垂直消隐间隔期间的每个场的规定的第L行中包括预定幅度的M个重影消除参考（GCR）信号的周期之一和各个定相。滤波器电路响应于第一复合视频信号产生第二复合视频信号，该第一复合视频信号根据由存储无重影GCR信号的计算机产生的滤波器编程信号进行调整。计算机接收具有伴随重影的GCR信号，并将其与存储的无重影GCR信号进行比较，从而执行用于计算滤波器编程信号的相关程序。第二复合视频信号是对伴随的鬼影减弱的第一复合视频信号的响应。同步脉冲与复合视频信号分离，扫描线计数器对水平同步脉冲进行计数，产生行计数，并通过每个垂直同步脉冲复位到初始行计数。第L行分隔符响应用于分离包括GCR信号的第二复合视频信号的扫描线的行计数。场计数器对M模M的垂直同步脉冲进行计数，产生与M.GCR信号的周期同步的场计数。时间滤波器组合M×N个连续扫描线，以产生提供给计算机的时间滤波响应作为具有伴随重影的降噪GCR信号。

8. 发明授权

US5548617A Digital VSB detector with bandpass phase tracker using rader filters, as for use in an HDTV receiver 失效
标题翻译：数字VSB检测器，带有使用雷达滤波器的带通相位跟踪器，用于HDTV接收机
公开(公告)号：US5548617A
公开(公告)日：1996-08-20
申请号：US243480
申请日：1994-05-19
申请人： Chandrakant B. Patel , Allen L. Limberg
发明人： Chandrakant B. Patel , Allen L. Limberg
IPC分类号： H04L27/38 , H04N5/44 , H04N5/455 , H04N5/50 , H04N7/015 , H04L27/06 , H03K1/00
CPC分类号： H04N5/4401 , H04L27/3836 , H04N5/455 , H04N5/50
摘要： In a radio receiver for receiving vestigial sideband (VSB) signals including symbol codes descriptive of digital signals, HDTV signals being exemplary of such VSB signals, a tuner provides for selecting one of channels at different locations in a frequency band used for transmitting such VSB signals. The tuner also includes mixers for performing plural conversion of the selected channel to a final intermediate-frequency signal, which is digitized by an analog-to-digital converter. A phase tracker, operative on narrow-bandpass filtered portions of the digitized final intermediate frequency signal centering on its carrier frequency, suppresses an imaginary portion of the final intermediate-frequency signal, arising from multipath distortion or from phase incoherency in local oscillations used during frequency conversion. A digital controlled oscillator in the phase tracker supplies digital descriptions of the carrier wave for the final intermediate-frequency signal to a synchronous detector, which synchronous detector detects the real portion of the digitized final intermediate-frequency signal in accordance with those digital descriptions of the carrier wave pair of all-pass digital filters, which exhibit a constant .pi./2 difference in phase response for the digitized bandpass signals and are designed based on Jacobian elliptic functions as described by C. M. Rader, are used in the phase tracker for generating the real and imaginary portions of the digitized final intermediate-frequency signal.
摘要翻译：在用于接收包括描述数字信号的符号代码的残留边带（VSB）信号的无线电接收机中，HDTV信号是这样的VSB信号的示例，调谐器提供用于在用于发送这样的VSB信号的频带中的不同位置处选择一个信道。调谐器还包括用于执行所选频道的多个转换到由模数转换器数字化的最终中频信号的混频器。基于其载波频率的数字化最终中频信号的窄带通滤波部分的相位跟踪器抑制由多径失真引起的最终中频信号的虚部，或者在频率期间使用的局部振荡中的相位不相干性转换。相位跟踪器中的数字控制振荡器将最终中频信号的载波的数字描述提供给同步检波器，该同步检测器根据这些数字描述的数字化最终中频信号的实际部分对于数字化带通信号，其相位响应表现出常数pi / 2的全波数字滤波器的载波对，并且基于由CM Rader描述的雅可比椭圆函数设计，用于相位跟踪器中以产生真实的和数字化的最终中频信号的虚部。

9. 发明授权

US5083197A Apparatus for restoring the correct phase relation of the chroma and luminance signals passed through separate paths 失效
标题翻译：恢复通过分离纸通过的色谱和发光信号的正确相位关系的装置
公开(公告)号：US5083197A
公开(公告)日：1992-01-21
申请号：US531144
申请日：1990-05-31
申请人： Jung-Wan Ko , Chandrakant B. Patel
发明人： Jung-Wan Ko , Chandrakant B. Patel
IPC分类号： H04N9/89 , G11B20/02 , H04N9/77 , H04N9/83
CPC分类号： H04N9/77
摘要： Apparatus is disclosed for processing the chroma and luminance signals reproduced from a magnetic recording medium. The chroma signal in passing through a separate path from the luminance signal may suffer a phase displacement relative to the phase of the reference luminance signal. Means are provided for connection between the chroma channel and the luminance channel to generate an error signal representing the phase displacement of the chroma signal relative to the reference luminance signal. Additional means are provided to use this phase error signal to restore the phase of the chroma signal to its original phase relative to the reference luminance signal, whereby to insure the accuracy with which the signals modulating the chroma carrier can be demodulated.
摘要翻译：公开了用于处理从磁记录介质再现的色度和亮度信号的装置。通过与亮度信号分离的路径的色度信号可能遭受相对于参考亮度信号的相位的相位偏移。提供了用于色度通道和亮度通道之间的连接的装置，以产生表示色度信号相对于基准亮度信号的相位偏移的误差信号。提供附加装置以使用该相位误差信号将色度信号的相位相对于参考亮度信号恢复到其原始相位，从而确保调制色度载波的信号的精度可被解调。

10. 发明授权

US4731648A Interstitial signal generating system 失效
标题翻译：间歇信号发生系统
公开(公告)号：US4731648A
公开(公告)日：1988-03-15
申请号：US912628
申请日：1986-09-29
申请人： Francis S. Bernard , Chandrakant B. Patel
发明人： Francis S. Bernard , Chandrakant B. Patel
IPC分类号： H04N7/01 , H04N5/14 , H04N5/44 , H04N7/18
CPC分类号： H04N7/012 , H04N5/144
摘要： A system for generating an interstitial signal for a double scanning non-interlaced (progressive scan) television display is disclosed. When no motion is detected in the neighborhood of the interstitial pixel, a pixel generated from pixels in the adjacent fields to that of said interstitial pixel is supplied at the interstitial pixel for further processing. When motion in a relatively downward direction is detected, then a pixel generated from pixels in lower adjacent lines to, and in the same field as, that of the interstitial pixel is supplied as the interstitial pixel. When motion in a relatively upward direction is detected, then a pixel generated from pixels in upper adjacent lines to, and in the same field as, that of the interstitial pixel is supplied as the interstitial pixel.
摘要翻译：公开了一种用于产生双扫描非隔行（逐行扫描）电视显示器的间隙信号的系统。当在间隙像素的附近没有检测到运动时，在间隙像素处提供从相邻场中的像素产生的像素与所述间隙像素的像素进行进一步处理。当检测到相对向下的方向的运动时，从与间隙像素相同的场中的像素生成的像素作为间隙像素被提供。当检测到在相对向上的方向上的运动时，从与间隙像素的上相邻行中的像素和与其相同的场中的像素产生的像素被提供作为间隙像素。

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