公开(公告)号：US5376968A

公开(公告)日：1994-12-27

申请号：US23251

申请日：1993-03-11

申请人： Allen Wu ,  Edward A. Krause ,  Woo H. Paik

发明人： Allen Wu ,  Edward A. Krause ,  Woo H. Paik

IPC分类号： H04N7/30 ,  G06T9/00 ,  H03M7/30 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50 ,  H04N7/137

CPC分类号： H04N19/90 ,  H04N19/12 ,  H04N19/186 ,  H04N19/503 ,  H04N19/51 ,  H04N19/517 ,  H04N19/61

摘要： Digital video signals are adaptively compressed for communication to a receiver. Superblocks, each containing a plurality of blocks of digital video data, are compressed using PCM, DPCM with a general motion vector for the entire superblock, and DPCM with a specific motion vector for each block contained within a superblock. The result of each compression mode is compared after accounting for overhead data, to determine which results in the least amount of data for each block. These blocks are assembled into a superblock, and compared together with necessary overhead and motion vector data to the same superblock processed using all PCM as well as the superblock processed using all DPCM. The comparison determines which compression mode produces the least amount of data for the superblock. The most compact superblock is selected for transmission. The transmitted superblocks are decoded by a decoder that recovers the necessary motion vectors and overhead information which identifies the type of compression used to provide the superblock.

摘要翻译： 数字视频信号被自适应地压缩以用于与接收机的通信。 使用具有用于整个超块的通用运动矢量的PCM，DPCM以及包含在超级块内的每个块的特定运动矢量的DPCM对每个包含多个数字视频数据块的超块进行压缩。 在计算开销数据后，对每个压缩模式的结果进行比较，以确定每个块的数据量最少的结果。 这些块被组装成超级块，并且与必要的开销和运动矢量数据一起与使用所有PCM处理的相同的超级块以及使用所有DPCM处理的超级块进行比较。 该比较确定哪个压缩模式为超级块产生最少量的数据。 选择最紧凑的超级块进行传输。 发送的超块被解码器解码，该解码器恢复必要的运动矢量和标识用于提供超级块的压缩类型的开销信息。

公开(公告)号：US5243624A

公开(公告)日：1993-09-07

申请号：US733791

申请日：1991-07-26

申请人： Woo H. Paik ,  Scott A. Lery ,  Allen Wu

发明人： Woo H. Paik ,  Scott A. Lery ,  Allen Wu

IPC分类号： H03H21/00 ,  H03H15/00 ,  H03H17/00 ,  H04B3/06 ,  H04L25/03 ,  H04L27/01

CPC分类号： H04L25/03038 ,  H04L2025/0342 ,  H04L2025/03477 ,  H04L2025/03617

摘要： Convergence of a complex adaptive equalizer used in digital communications is substantially improved by updating all coefficients of the equalizer during each filter clock cycle. Complex signal data is passed through a plurality of successive delay stages to provide N sets of delayed complex signal data. The product of each set and a complex error signal is obtained. Each product is concurrently updated with previous product data for the set to provide N sets of updated complex coefficients for selective input to equalizer filters. In an illustrated embodiment, the updated coefficients are truncated and their gain is adjusted prior to input to the filters. The updated coefficients can be multiplexed to provide a clocked stream of coefficient sets for input to the equalizer filters. A VLSI implementation of the equalizer is also disclosed.

公开(公告)号：US5233348A

公开(公告)日：1993-08-03

申请号：US858101

申请日：1992-03-26

申请人： Stephen C. Pollmann ,  Paul Moroney ,  Edward A. Krause ,  Paul Shen ,  Woo H. Paik

发明人： Stephen C. Pollmann ,  Paul Moroney ,  Edward A. Krause ,  Paul Shen ,  Woo H. Paik

IPC分类号： H03M7/40 ,  G06T9/00 ,  H03M7/42 ,  H04N7/26 ,  H04N7/30

CPC分类号： H03M7/425 ,  H04N19/60 ,  H04N19/13 ,  H04N19/91

摘要： Apparatus is provided for decoding variable length code words to recover transform coefficients, such as DCT transform coefficients provided by a high definition television encoder. A first category of the code words has a length of no more than n bits. A second category has a length of greater than n bits. A feedback ROM is used to decode the code words. Code words from the first category are processed by directly addressing a lookup table in the ROM. Code words from the second category are processed using multiple passes through the ROM, wherein a portion of the data output during a prior pass is fed back to address the memory during a subsequent pass.

公开(公告)号：US5136411A

公开(公告)日：1992-08-04

申请号：US409214

申请日：1989-09-19

申请人： Woo H. Paik ,  David Grubb, III ,  David E. Charlton

发明人： Woo H. Paik ,  David Grubb, III ,  David E. Charlton

IPC分类号： H04B10/00 ,  H04H20/69 ,  H04J14/02 ,  H04N7/173 ,  H04N7/22

CPC分类号： H04H20/69 ,  H04J14/0226 ,  H04J14/0232 ,  H04J14/0282 ,  H04N7/17309 ,  H04N7/17345 ,  H04N7/17363 ,  H04N7/22 ,  H04J14/0298 ,  H04N2007/1739

摘要： A CATV system uses a single single-mode optical fiber for transmitting a composite optical signal containing television signals in different frequency channels for a plurality of subscriber terminals from a headend terminal to a distribution terminal, and converts the transmitted signals at the distribution terminal into electrical signals for distribution to a plurality of subscriber terminals over a plurality of coaxial cables. The distribution terminal further receives electrical service request signals from each of the plurality of subscriber terminals, and converts each received service request signal into an optical service request signal for transmission to the headend terminal over the same single-mode optical fiber as used from transmitting the composite optical signal. Wavelength-division multiplexer/demultiplexers couple the optical fiber to the headend terminal and the distribution terminal to enable bidirectional transmission. The subscriber terminal is responsive to a control signal transmitted to the subscriber terminal for enabling a receiver therein to receive television signals transmitted to the subscriber terminal over a selected one of said different given frequency channels. The headend terminal includes a digital switch that is operated in coordination with the control signals that are transmitted to the subscriber terminals for enabling reception of only selected frequency channels in the respective subscriber terminals, by frequency positioning the television signal indicated by the service request signal received from a given subscriber terminal within the composite signal for transmission to the given subscriber terminal over the given frequency channel enabled by the control signal that is transmitted to the given subscriber terminal.

摘要翻译： CATV系统使用单个单模光纤将多个用户终端的不同频率信道中包含电视信号的复合光信号从头端到分配终端发送，并将分配终端处的发送信号转换为电 用于通过多个同轴电缆分配给多个用户终端的信号。 分配终端还从多个用户终端中的每一个接收电服务请求信号，并将每个所接收的服务请求信号转换成光业务请求信号，以便通过相同的单模光纤传输到头端终端， 复合光信号。 波分复用器/解复用器将光纤耦合到头端和分配终端以实现双向传输。 用户终端响应于发送到用户终端的控制信号，使得其中的接收机能够接收通过所选择的所述不同给定频率信道中的所选择的一个发送到用户终端的电视信号。 前端终端包括数字交换机，其与传送到用户终端的控制信号协同操作，以便仅通过接收的服务请求信号指示的电视信号频率定位，以便仅接收各个用户终端中的选定频道 从复合信号内的给定用户终端，通过由发送给给定用户终端的控制信号使能的给定频率信道传输给给定用户终端。

公开(公告)号：US5093720A

公开(公告)日：1992-03-03

申请号：US570157

申请日：1990-08-20

申请人： Edward A. Krause ,  Woo H. Paik ,  Vincent Liu ,  James N. Esserman

发明人： Edward A. Krause ,  Woo H. Paik ,  Vincent Liu ,  James N. Esserman

IPC分类号： H04N7/26 ,  H04N7/36

CPC分类号： H04N19/105 ,  H04N19/112 ,  H04N19/137 ,  H04N19/51

摘要： Motion compensated coding of interlaced digital video signals is provided. Pixel data from successive interlaced video fields is compared to similarly situated pixel data in a plurality of previous fields to find a preferred counterpart for each current field set of pixel data. A prediction error signal is generated for each current field set of pixel data indicative of the difference between it and its preferred counterpart from a previous field. Each prediction error signal is encoded with data indicative of the previous field in which the preferred counterpart can be found. In a preferred embodiment, each set of current field pixel data is compared to a range of similarly situated pixels in each of the previous fields, and the prediction error signal is also encoded with motion vector data indicative of the location of the preferred counterpart in its previous field.

摘要翻译： 提供了隔行数字视频信号的运动补偿编码。 将来自连续隔行视频场的像素数据与多个先前场中的类似位置的像素数据进行比较，以找到每个当前像素数据集合的优选对应物。 针对象征数据的每个当前场集合生成一个预测误差信号，指示其与先前场的优先对应物之间的差异。 每个预测误差信号用指示可以找到优选对应物的前一场的数据进行编码。 在优选实施例中，将每组当前场像素数据与先前场的每个场中的类似位置的像素的范围进行比较，并且预测误差信号也用表示优选对应物位置的运动矢量数据进行编码 以前的字段。

公开(公告)号：US5091782A

公开(公告)日：1992-02-25

申请号：US507258

申请日：1990-04-09

申请人： Edward A. Krause ,  Woo H. Paik

发明人： Edward A. Krause ,  Woo H. Paik

IPC分类号： H04N1/413 ,  G06T9/00 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50 ,  H04N11/04

CPC分类号： H04N19/154 ,  H04N19/112 ,  H04N19/136 ,  H04N19/176 ,  H04N19/61 ,  H04N19/60

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.

公开(公告)号：US4752953A

公开(公告)日：1988-06-21

申请号：US895150

申请日：1986-08-11

申请人： Woo H. Paik ,  Jerrold A. Heller ,  Gordon K. Walker

发明人： Woo H. Paik ,  Jerrold A. Heller ,  Gordon K. Walker

IPC分类号： G11B20/10 ,  G11B20/18 ,  H04K1/02 ,  H04N9/802 ,  H04L9/00

CPC分类号： H04N9/802 ,  G11B20/10527 ,  G11B20/1809 ,  H04K1/02

摘要： In a system for scrambling an audio signal for transmission with a video signal having non-video information intervals, an analog audio signal is converted into a scrambled compressed digital audio signal; individual bits from the scrambled compressed digital audio signal are combined to provide 2-bit digital words; each digital word is converted into an 8-bit digital PAM data signal having a binary value bearing a predetermined relationship to the binary value of the converted 2-bit digital word; the 8-bit digital PAM data signal is converted into a 4-level PAM analog signal; and the PAM analog signals are inserted into the non-video information intervals of the video signal for transmission. A descrambling system descrambles the 4-level PAM analog signals by a complementary scheme.

摘要翻译： 在具有用于具有非视频信息间隔的视频信号进行发送的音频信号加扰的系统中，模拟音频信号被转换成加扰的压缩数字音频信号; 来自加扰的压缩数字音频信号的各个比特被组合以提供2比特的数字字; 每个数字字被转换成具有与转换的2位数字字的二进制值具有预定关系的二进制值的8位数字PAM数据信号; 8位数字PAM数据信号被转换为4级PAM模拟信号; 并将PAM模拟信号插入视频信号的非视频信息间隔中进行传输。 解扰系统通过互补方案解扰4电平PAM模拟信号。

公开(公告)号：US4563702A

公开(公告)日：1986-01-07

申请号：US498875

申请日：1983-05-27

申请人： Jerrold A. Heller ,  Woo H. Paik

发明人： Jerrold A. Heller ,  Woo H. Paik

IPC分类号： H04K1/06 ,  H04K1/00 ,  H04N7/16 ,  H04N7/167 ,  H04N7/169 ,  H04L9/00

CPC分类号： H04N7/1696 ,  H04N7/1675 ,  H04N7/169

摘要： Systems for scrambling and descrambling video information lines. The scrambling system includes a memory; a storage system for sequentially storing groups of four video information lines in the memory; and a retrieval means for forming groups of four scrambled video information lines by retrieving the stored video information from the memory in a sequence different from the sequence within the stored group in which the information was stored. The retrieval system forms the scrambled video information lines by retrieving a portion of a first stored video information line from a first position therein to form a portion of a first scrambled video information line occupying a second position therein; retrieving a portion of the first stored video information line from the corresponding second position therein to form a portion of a second scrambled video information line occupying a position therein other than the corresponding second position; and forming the portion of the first scrambled video information line occupying the corresponding first position therein by retrieving a portion of a stored video information line other than the first stored video information line from a position therein other than the corresponding first position. The sequence of formation of the scrambled lines, the respective sizes of the retrieved portions, and the combinations of stored video lines within the stored groups for forming the first and second scrambled video lines are varied from one group to the next in response to a keystream of control bits. The descrambling system functions conversely to the scrambling system.

摘要翻译： 用于加扰和解扰视频信息线的系统。 加扰系统包括存储器; 用于在存储器中顺序地存储四条视频信息线组的存储系统; 以及检索装置，用于通过以与存储信息的存储组中的序列不同的顺序从存储器检索所存储的视频信息来形成四个加扰视频信息行的组。 检索系统通过从其中的第一位置检索第一存储的视频信息行的一部分来形成加扰视频信息行，以形成其中占据第二位置的第一加扰视频信息行的一部分; 从其中的对应的第二位置检索第一存储的视频信息行的一部分，以形成其中除了对应的第二位置之外的位置的第二加扰视频信息行的一部分; 以及通过从除了对应的第一位置之外的位置检索除了所述第一存储的视频信息行之外的所存储的视频信息行的一部分，来形成占据其中相应的第一位置的所述第一加扰视频信息线的部分。 加密线的形成顺序，检索部分的相应大小以及用于形成第一和第二加扰视频行的存储组内存储的视频线的组合响应密钥流从一组变化到下一组 的控制位。 解扰系统与加扰系统相反。

公开(公告)号：US5241563A

公开(公告)日：1993-08-31

申请号：US927827

申请日：1992-08-10

申请人： Woo H. Paik ,  John M. Fox ,  Scott A. Lery

发明人： Woo H. Paik ,  John M. Fox ,  Scott A. Lery

IPC分类号： H04B14/04 ,  H03M13/27 ,  H03M13/33 ,  H04L7/00

CPC分类号： H03M13/2732 ,  H03M13/33

摘要： An interleaver processes information in a pseudorandom order to provide pseudorandom interleaved data for communication to a deinterleaver. The pseudorandom interleaved data is processed at the deinterleaver in a pseudorandom order corresponding to that used at the interleaver 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 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.

公开(公告)号：US5216503A

公开(公告)日：1993-06-01

申请号：US809561

申请日：1991-12-24

申请人： Woo H. Paik ,  Edward A. Krause ,  Vincent Liu ,  Paul Shen ,  Henry Derovanessian

发明人： Woo H. Paik ,  Edward A. Krause ,  Vincent Liu ,  Paul Shen ,  Henry Derovanessian

IPC分类号： H04N1/41 ,  G06T9/00 ,  H04N7/08 ,  H04N7/081 ,  H04N7/58 ,  H04N19/00 ,  H04N21/2365 ,  H04N21/434

CPC分类号： H04N21/2365 ,  H04N19/115 ,  H04N19/124 ,  H04N19/15 ,  H04N19/152 ,  H04N19/176 ,  H04N21/23655 ,  H04N21/4347 ,  H04N19/30

摘要： A multichannel image compression system uses a plurality of encoders 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 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. 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 is provided to recover an image from the compressed image data.