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11.发明公开Apparatus and method for adaptively compressing successive blocks of digital video 失效装置和数字视频信号的连续的块的自适应压缩方法。
公开(公告)号：EP0451545A1
公开(公告)日：1991-10-16
申请号：EP91104132.5
申请日：1991-03-18
发明人： Krause, Edward A. , Paik, Woo H.
IPC分类号： H04N7/32
CPC分类号： H04N19/154 , H04N19/112 , H04N19/136 , H04N19/176 , H04N19/60 , H04N19/61
摘要： The compression of successive blocks of digital data is optimized by selecting between different compression algorithms or different data formats on a block-by-block basis. In one application, digitized interlaced video signals are processed for transmission in a compressed form. A set of pixel data presented in a field format is compressed to provide a first compressed video signal. The set of pixel data is also presented in a frame format and compressed to provide a second compressed video signal. Errors are evaluated in the first and second compressed video signals. The compressed video signal having the least error is selected for further processing. The technique is repeated for successive sets of pixel data and the selected signals are encoded to identify them as field formatted or frame formatted signals. The encoded selected signals are then combined to provide a compressed video signal data stream for transmission. Apparatus for receiving and decoding the signals is also disclosed.
摘要翻译： 数字数据的连续块的压缩是通过在块逐块基础不同的压缩算法或不同的数据格式之间选择优化。 在一个应用中，数字化的隔行视频信号被处理为以压缩的形式传输。一组中的一个领域格式呈现的像素数据被压缩以提供第一压缩的视频信号。 因此，该组像素数据是在帧格式呈现并压缩以提供压缩的第二视频信号。 误差评估在所述第一和第二压缩视频信号。 被选择用于进一步处理具有最小误差的压缩的视频信号。 重复连续组像素数据和所选择的信号的技术被编码，以确定它们作为字段格式化或帧格式的信号。 然后，编码的选择的信号被组合，以提供用于传输的压缩的视频信号数据流。 装置，用于接收和解码所述信号是如此游离缺失盘。
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12.发明授权Method and apparatus for updating coefficients in a complex adaptive equalizer 失效用于更新一个复杂的自适应均衡器的系数的方法和装置
公开(公告)号：EP0524560B1
公开(公告)日：1997-09-03
申请号：EP92112306.3
申请日：1992-07-18
发明人： Paik, Woo H. , Lery, Scott A. , Wu, Allen
IPC分类号： H04L25/03
CPC分类号： H04L25/03038 , H04L2025/0342 , H04L2025/03477 , H04L2025/03617
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公开(公告)号：EP0524559B1
公开(公告)日：1997-05-02
申请号：EP92112305.5
申请日：1992-07-18
发明人： Paik, Woo H. , Lery, Scott A. , Tom, Adam S.
CPC分类号： H04L25/0314 , H04L27/3827
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公开(公告)号：EP0582827A3
公开(公告)日：1995-10-18
申请号：EP93110651.2
申请日：1993-07-03
发明人： Paik, Woo H. , Fox, John M. , Lery, Scott A.
CPC分类号： H03M13/2732 , H03M13/33
摘要： An interleaver (34) processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver (42). The pseudorandom interleaved data is processed at the deinterleaver (42) in a pseudorandom order corresponding to that used at the interleaver (34) means, to recover the original information. The pseudorandom processing at the deinterleaver is synchronized with the pseudorandom processing at the interleaver on a trial and error basis. In one embodiment, full synchronization occurs when a Viterbi decoder (44) receiving data from the deinterleaver has a renormalization rate within a designated threshold and when enough synchronization words are detected in data output from the deinterleaver to meet a predetermined criterion. In another embodiment, a timer is used to initiate a new starting address for the pseudorandom processing at the deinterleaver during successive time intervals. Synchronization is achieved when a start address is found that results in the detection of enough synchronization words in data output from the deinterleaver to meet a predetermined synchronization criterion.
摘要翻译： 交织器（34）以伪随机顺序处理信息以提供用于与解交织器（42）进行通信的伪随机交织数据。 在去交错器（42）以与交织器（34）装置上使用的伪随机顺序相对应的伪随机顺序处理伪随机交织的数据，以恢复原始信息。 解交织器上的伪随机处理与在交织器上的伪随机处理以试错法同步。 在一个实施例中，当从解交织器接收数据的维特比解码器（44）在指定阈值内具有重正化率并且当从解交织器输出的数据中检测到足够的同步字以满足预定标准时，发生完全同步。 在另一个实施例中，定时器用于在连续时间间隔期间在解交织器处启动用于伪随机处理的新起始地址。 当发现起始地址导致从解交织器输出的数据中检测足够的同步字以满足预定的同步标准时，实现同步。
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15.发明公开Two stage accumulator for use in updating coefficients 失效Zweistufiger Akkumulator zur Anwendung bei der Aktualisierung von Koeffizienten。
公开(公告)号：EP0598347A2
公开(公告)日：1994-05-25
申请号：EP93118304.0
申请日：1993-11-11
发明人： Wu, Allen , Paik, Woo H.
CPC分类号： G06F7/5095 , G06F7/62
摘要： A two stage accumulator is provided for updating coefficients. The accumulator is particularly useful in an adaptive equalizer. A first stage of the accumulator receives an error word and outputs sign and carry bits resulting from the addition of the error word and an N-bit LSB portion of a larger M-bit coefficient. A second stage is responsive to the sign and carry bits for updating the (M-N) MSB's of the M-bit coefficient. New error words are cyclically provided to the first stage during successive coefficient update cycles. The first stage can be implemented using an N-bit twos complement adder. The second stage can be implemented using an up/down counter. A leakage function is provided by causing the up/down counter to periodically skip over increment and decrement cycles.
摘要翻译： 提供两级累加器用于更新系数。 累加器在自适应均衡器中特别有用。 累加器的第一级接收错误字，并输出符号并携带由误差字的加法和较大M位系数的N位LSB部分产生的位。 第二级响应于符号并携带用于更新M位系数的（M-N）个MSB的位。 在连续的系数更新周期期间，将新的误差字循环地提供给第一级。 第一级可以使用N位二进制补码加法器来实现。 第二阶段可以使用向上/向下计数器来实现。 通过使上/下计数器周期性地跳过增量和递减周期来提供泄漏功能。
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公开(公告)号：EP0525641A3
公开(公告)日：1993-08-04
申请号：EP92112587.8
申请日：1992-07-23
发明人： Paik, Woo H. , Lery, Scott A. , Heegard, Chris
CPC分类号： H04L1/0057 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L27/3438 , H04N7/015 , H04N21/2383 , H04N21/4382
摘要： Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM, to provide a practical coding structure that is both efficient in bandwidth and data reliability. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder (Fig. 2), an N-bit QAM constellation pattern (80) is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword (92) is assigned to each of the four subsets (82, 84, 86, 88). A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm, such as a Reed-Solomon code (12). Part of the symbol is then encoded (48) with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped (50) with the remaining bits of the symbol to provide a modulation function, wherein the remaining bits (94) correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. At a receiver (Fig. 3), the recovered modulation function is pruned (62) to provide a set of metrics (66) corresponding to the subsets and to provide a plurality of conditional determinations of the constellation point identified by the remaining bits. The metrics are used in a rate 1/2 trellis decoder (68) to recover a first bit that is encoded using a rate 1/2 encoding algorithm to recreate the QPSK codeword. One of a plurality of the conditional determinations is selected in response to the recreated codeword. The selected conditional determination is combined with the recovered first bit to provide a decoded output that is further decoded using a symbol error correcting algorithm such as a Reed-Solomon code (36).
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17.发明公开Statistical multiplexer for a multichannel image compression system 失效Statistischer Multiplexerfürein Multikanal-Bildkomprimierungssystem。
公开(公告)号：EP0550843A1
公开(公告)日：1993-07-14
申请号：EP92121030.8
申请日：1992-12-10
CPC分类号： H04N21/2365 , H04N19/115 , H04N19/124 , H04N19/15 , H04N19/152 , H04N19/176 , H04N19/30 , H04N21/23655 , H04N21/4347
摘要： A multichannel image compression system uses a plurality of encoders (10, 12 ... 14) to compress image data. A coding level command is provided to each of the encoders to specify a level of quality to be provided by each encoder. Encoded image data, provided by the encoders in response to the coding level command, is multiplexed (26) into a combined signal for transmission. The coding level command is adjusted in response to an accumulated amount of data from the combined signal, to maintain the accumulated data within a throughput capability of a communication channel (48). Although the coding level command may specify a global coding level that is the same for all of the encoders, the encoders can derive local coding levels from the global coding level to provide different encoding qualities. Decoder apparatus (30-46) is provided to recover an image from the compressed image data.
摘要翻译： 多通道图像压缩系统使用多个编码器（10,12〜14）来压缩图像数据。 为每个编码器提供编码电平命令，以指定由每个编码器提供的质量水平。 由编码器响应于编码电平命令提供的编码图像数据被多路复用（26）成为用于发送的组合信号。 响应于来自组合信号的累积的数据量来调整编码电平命令，以将累积的数据保持在通信信道（48）的吞吐量能力内。 虽然编码电平命令可以指定对于所有编码器相同的全局编码电平，编码器可以从全局编码级别导出本地编码电平，以提供不同的编码质量。 提供解码器装置（30-46）以从压缩图像数据中恢复图像。
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18.发明公开Method and apparatus for communicating compressed digital video signals using multiple processors 失效使用多个处理器传播压缩数字视频信号的方法和装置
公开(公告)号：EP0499088A3
公开(公告)日：1993-05-19
申请号：EP92101401.5
申请日：1992-01-29
发明人： Shen, Paul , Krause, Edward A. , Paik, Woo H.
CPC分类号： H04N19/00 , H04N19/107 , H04N19/30 , H04N19/436 , H04N19/577 , H04N19/61 , H04N19/70 , H04N21/236 , H04N21/434
摘要： Digital video signals are processed by a plurality of independently operating processors (42, 44, 46, 48) to provide data for transmission in a compressed, motion compensated form. A video image frame area (10) is divided into a set of subframes (12, 16, 20, 24). The set of subframes is systematically shifted such that the individual subframes progressively cycle across and wrap around the video image frame area. For each successive video frame, video image data bounded by each of the different subframes is independently compressed using motion estimation to reduce data redundancy among the successive frames. The motion estimation is limited for each subframe of a current video frame to areas of a previous video frame that were bounded by the same subframe in the previous frame. In an illustrated embodiment, the set of subframes (12, 16, 20, 24) is shifted once for each successive video frame, and each subframe includes a refresh region (14, 18, 22, 26) whereby the video image frame area (10) is progressively refreshed as the subframes are shifted thereacross. Receiver apparatus (60-82) for use in decoding the independently processed subframe data is also disclosed.
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公开(公告)号：EP0525641A2
公开(公告)日：1993-02-03
申请号：EP92112587.8
申请日：1992-07-23
发明人： Paik, Woo H. , Lery, Scott A. , Heegard, Chris
CPC分类号： H04L1/0057 , H04L1/006 , H04L1/0065 , H04L1/0071 , H04L27/3438 , H04N7/015 , H04N21/2383 , H04N21/4382
摘要： Coded modulation schemes based on codes for QPSK modulation are directly incorporated into QAM based modulation systems, forming trellis coded QAM, to provide a practical coding structure that is both efficient in bandwidth and data reliability. Concatenated coding with QPSK based trellis coding and symbol error correcting coding is used. In an encoder (Fig. 2), an N-bit QAM constellation pattern (80) is divided into four subsets, each including N/4 symbol points of the constellation pattern. A two-bit QPSK codeword (92) is assigned to each of the four subsets (82, 84, 86, 88). A symbol to be transmitted is first encoded using an outer error correcting encoding algorithm, such as a Reed-Solomon code (12). Part of the symbol is then encoded (48) with an inner code that comprises a rate 1/2 trellis encoding algorithm to provide a QPSK codeword, which is mapped (50) with the remaining bits of the symbol to provide a modulation function, wherein the remaining bits (94) correlate the symbol with one of the symbol points included in the subset defined by the QPSK codeword. At a receiver (Fig. 3), the recovered modulation function is pruned (62) to provide a set of metrics (66) corresponding to the subsets and to provide a plurality of conditional determinations of the constellation point identified by the remaining bits. The metrics are used in a rate 1/2 trellis decoder (68) to recover a first bit that is encoded using a rate 1/2 encoding algorithm to recreate the QPSK codeword. One of a plurality of the conditional determinations is selected in response to the recreated codeword. The selected conditional determination is combined with the recovered first bit to provide a decoded output that is further decoded using a symbol error correcting algorithm such as a Reed-Solomon code (36).
摘要翻译： 基于用于QPSK调制的编码的编码调制方案直接并入基于QAM的调制系统中，形成网格编码QAM，以提供在带宽和数据可靠性方面都有效的实用编码结构。 使用基于QPSK的网格编码和符号纠错编码的并行编码。 在编码器（图2）中，N位QAM星座图（80）被划分成四个子集，每个子集包括星座图案的N / 4个符号点。 将两比特QPSK码字（92）分配给四个子集（82,84,86,88）中的每一个。 首先使用诸如Reed-Solomon码（12）之类的外部纠错编码算法对要发送的符号进行编码。 然后使用包含速率1/2格状编码算法的内码对部分符号（48）进行编码（48），以提供与所述符号的剩余比特（50）映射（50）以提供调制功能的QPSK码字，其中 其余位（94）使符号与包括在由QPSK码字定义的子集中的符号点之一相关联。 在接收机（图3），修复恢复的调制功能（62）以提供对应于子集的一组度量（66），并提供由剩余比特识别的星座点的多个条件确定。 度量用于速率1/2网格解码器（68）以恢复使用速率1/2编码算法编码的第一比特，以重新创建QPSK码字。 响应于重新创建的码字来选择多个条件确定中的一个。 选择的条件确定与恢复的第一位组合以提供使用诸如里德 - 所罗门码（36）的符号纠错算法进一步解码的解码输出。
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公开(公告)号：EP0346700A2
公开(公告)日：1989-12-20
申请号：EP89109971.5
申请日：1989-06-02
发明人： Paik, Woo H.
IPC分类号： H04N7/167
CPC分类号： H04N7/1713
摘要： A descrambler for a scrambled channel having a suppressed horizontal synchronization pulse which scrambled channel is provided in a broadband cable television signal along with nonscrambled channels. A signal splitter receives the broadband CATV signal and provides first and second split outputs. A switch coupled to the second output of the signal splitter passes the horizontal synchronization pulse of the scrambled channel and blocks the video signal of the scrambled channel. The horizontal synchronization pulse passing through the switch is then phase adjusted to synchronize with the horizontal synchronization pulse of the scrambled channel provided at the first output of the signal splitter, and both horizontal synchronization pulses are summed in a combiner along with the video/audio signal provided at the first output of the signal splitter. Consequently, the full synchronization pulse is provided at the output of the combiner to descramble the scrambled channel. No band reject filter is required between the first output of the power splitter and the power combiner so that the nonscrambled channels are unaffected by the descrambler.
摘要翻译： 在宽带有线电视信号中与非加扰频道一起提供用于具有抑制了水平同步脉冲的扰频频道的解扰器，该频道被加扰了频道。 信号分路器接收宽带CATV信号并提供第一和第二分路输出。 耦合到信号分离器的第二输出端的开关传送加扰信道的水平同步脉冲并且阻塞加扰信道的视频信号。 然后对通过开关的水平同步脉冲进行相位调整以与在信号分离器的第一输出端提供的加扰通道的水平同步脉冲同步，并且两个水平同步脉冲在组合器中与视频/音频信号 在信号分配器的第一个输出端提供。 因此，在组合器的输出端提供全同步脉冲以对加扰信道进行解扰。 在功率分配器的第一输出端和功率合成器之间不需要带阻滤波器，以使非扰频信道不受解扰器的影响。
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