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：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.

公开(公告)号：US5068724A

公开(公告)日：1991-11-26

申请号：US538823

申请日：1990-06-15

申请人： Edward A. Krause ,  Woo H. Paik ,  Vincent Liu ,  Jim Essserman

发明人： Edward A. Krause ,  Woo H. Paik ,  Vincent Liu ,  Jim Essserman

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

CPC分类号： H04N19/107 ,  H04N19/51 ,  H04N19/61

摘要： A method and apparatus are provided for processing digital video signals for transmission in a compressed form. A set of pixel data is compressed without motion compensation to provide a first compressed video signal. The pixel data is compressed using motion compensation to provide a second compressed video signal. The data in the first and second compressed video signals is quantified. A comparison is made to determine which of the signals contains the least data. Successive sets of pixel data are sequentially compressed and quantified and the compressed video signal having the least data for each particular set is selected. The selected signals are encoded to identify them as motion compensated or non-motion compensated signals, and 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：US5315388A

公开(公告)日：1994-05-24

申请号：US791369

申请日：1991-11-19

申请人： Paul Shen ,  Woo H. Paik ,  Edward A. Krause

发明人： Paul Shen ,  Woo H. Paik ,  Edward A. Krause

IPC分类号： H03M7/00 ,  G06T1/60 ,  G11C7/10 ,  H04N5/907 ,  H04N7/26 ,  H04N7/32 ,  H04N7/36 ,  H04N7/50

CPC分类号： G11C7/1075 ,  G11C7/1036 ,  H04N19/423 ,  H04N19/433 ,  H04N19/51 ,  H04N19/61

摘要： A multiple serial access memory which includes a dynamic random access memory array is disclosed. The array is randomly addressed to input blocks of data. Address signals are provided to the array to output rows of data. A plurality of serial output ports are coupled to the output of the array for selectively latching different rows of data output from the array. The serial output ports are clocked to output the latched data therefrom. In an illustrated embodiment, each of the serial output ports contains a shift register having a length equal to the width of the memory array. The shift register is responsive to a first timing signal for latching a row of data from the array. A second timing signal actuates the shift register to shift a row of latched data. The serial access selector coupled to the shift register outputs a selected portion of the shifted data from the serial output port. The serial access memory has particular application as the frame store for a motion compensated interframe image coding/decoding system.

摘要翻译： 公开了一种包括动态随机存取存储器阵列的多串行存取存储器。 阵列随机地被寻址到输入数据块。 地址信号被提供给阵列以输出数据行。 多个串行输出端口耦合到阵列的输出端，用于选择性地锁存从阵列输出的不同数据行。 串行输出端口被计时以从其输出锁存的数据。 在所示实施例中，每个串行输出端口包含具有等于存储器阵列宽度的长度的移位寄存器。 移位寄存器响应于第一定时信号来锁存来自阵列的一行数据。 第二定时信号启动移位寄存器以移位一行锁存数据。 耦合到移位寄存器的串行访问选择器从串行输出端口输出移位数据的选定部分。 串行访问存储器具有特定的应用程序作为运动补偿帧间图像编码/解码系统的帧存储。

公开(公告)号：US5138447A

公开(公告)日：1992-08-11

申请号：US653779

申请日：1991-02-11

申请人： Paul Shen ,  Edward A. Krause ,  Woo H. Paik

发明人： Paul Shen ,  Edward A. Krause ,  Woo H. Paik

IPC分类号： H03M7/30 ,  G06T9/00 ,  H04N7/60 ,  H04N11/04 ,  H04N19/00 ,  H04N21/236 ,  H04N21/434

CPC分类号： H04N19/00 ,  H04N19/436 ,  H04N19/577 ,  H04N19/61 ,  H04N21/236 ,  H04N21/434 ,  H04N19/107 ,  H04N19/30 ,  H04N19/70

摘要： Digital video signals are processed by a plurality of independently operating processors to provide data for transmission in a compressed, motion compensated form. A video image frame area is divided into a set of subframes. 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 is shifted once for each successive video frame, and each subframe includes a refresh region whereby the video image frame area is progressively refreshed as the subframes are shifted thereacross. Receiver apparatus for use in decoding the independently processed subframe data is also disclosed.

公开(公告)号：US4926477A

公开(公告)日：1990-05-15

申请号：US206612

申请日：1988-06-14

申请人： Woo H. Paik

发明人： Woo H. Paik

IPC分类号： H04N7/171

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.

公开(公告)号：US5307375A

公开(公告)日：1994-04-26

申请号：US973430

申请日：1992-11-19

申请人： Allen Wu ,  Woo H. Paik

发明人： Allen Wu ,  Woo H. Paik

IPC分类号： H03H15/00 ,  G06F7/50 ,  G06F7/509 ,  G06F7/62 ,  H03H17/00 ,  H03H21/00 ,  H04B3/06 ,  H03K5/159

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相加和较大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。 在连续系数更新周期期间，新的错误字被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。

公开(公告)号：US5291281A

公开(公告)日：1994-03-01

申请号：US900904

申请日：1992-06-18

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

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

IPC分类号： H03M7/30 ,  G06T9/00 ,  H04N7/26 ,  H04N7/30 ,  H04N7/32 ,  H04N7/50 ,  H04N7/133

CPC分类号： H04N19/102 ,  H04N19/10 ,  H04N19/103 ,  H04N19/124 ,  H04N19/14 ,  H04N19/15 ,  H04N19/176 ,  H04N19/192 ,  H04N19/50 ,  H04N19/60 ,  H04N19/61 ,  H04N19/146 ,  H04N19/30 ,  H04N19/39

摘要： An apparatus and method for adaptively compressing blocks of video image data provide a local coding level for use in compressing successive blocks of video image data. Each block is preliminarily compressed using a global coding level. The preliminarily compressed data is processed to provide a measure of the randomness of an image area represented by the block of video image data. A local coding level is generated based on the randomness measure. The video image data is then compressed using the local coding level to provide compressed data for transmission. One or more intermediate compression stages can be provided, each generating an intermediate coding level, to better refine the randomness measure for use in generating the local coding level.

摘要翻译： 用于自适应地压缩视频图像数据块的装置和方法提供用于压缩视频图像数据的连续块的本地编码级别。 使用全局编码级别预先压缩每个块。 处理预先压缩的数据以提供由视频图像数据块表示的图像区域的随机性的度量。 基于随机度量产生局部编码级别。 然后使用本地编码级压缩视频图像数据，以提供用于传输的压缩数据。 可以提供一个或多个中间压缩级，每个中间压缩级产生中间编码级别，以便更好地改进用于产生本地编码级别的随机性度量。

公开(公告)号：US5241382A

公开(公告)日：1993-08-31

申请号：US871996

申请日：1992-04-25

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

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

IPC分类号： H04N5/44 ,  H04N7/50 ,  H04N7/54 ,  H04N11/04 ,  H04N11/24 ,  H04N19/89 ,  H04N21/236 ,  H04N21/2368 ,  H04N21/2383 ,  H04N21/40 ,  H04N21/434 ,  H04N21/438

CPC分类号： H04N11/044 ,  H04N11/008 ,  H04N11/042 ,  H04N19/61 ,  H04N19/89 ,  H04N21/2383 ,  H04N21/4382 ,  H04N5/4401 ,  H04N7/54

摘要： A macroblock packet format is provided for use in a digital HDTV system wherein successive video frames are divided into a plurality of macroblocks. The macroblocks comprise a plurality of superblocks, each containing a plurality of luminance and chrominance video data blocks. A DLEN field is provided in the macroblock packet format to identify the length of the macroblock packet. The packets also include variable length encoded portions of video data. The macroblock packets are transmitted in a data multiplex that also includes a next macroblock position (NMP) word. A receiver compares the DLEN information with the NMP word to verify synchronization, and reacquires the signal if synchronization has been lost.

摘要翻译： 提供了一种在数字HDTV系统中使用的宏块分组格式，其中连续的视频帧被分成多个宏块。 宏块包括多个超块，每个超块包含多个亮度和色度视频数据块。 以宏块分组格式提供DLEN字段以识别宏块分组的长度。 分组还包括视频数据的可变长度编码部分。 在包含下一个宏块位置（NMP）字的数据复用中发送宏块包。 接收机将DLEN信息与NMP字进行比较以验证同步，并且如果同步丢失，则重新获取信号。