公开(公告)号：EP0617518A2

公开(公告)日：1994-09-28

申请号：EP94104591.6

申请日：1994-03-23

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Derovanessian, Henry ,  Liu, Vincent

IPC分类号： H03M7/40

CPC分类号： H03M7/40

摘要： A variable length codeword packer (Fig. 3) communicates codeword data in successive m-bit bytes. A binary sum is accumulated (86) indicative of a total number of codeword bits received over time. A byte pointer (90) is derived from at least one most significant bit of the binary sum. A bit pointer (92) is derived from a plurality of least significant bits of the binary sum. A first data storage array (20) has a plurality of m-bit first storage bytes and is responsive to the byte pointer for storing received codeword data in the first storage bytes. A second data storage array (22) has a plurality of m-bit second storage bytes and is responsive to the byte and bit pointers for filling the second storage bytes with codeword data from the first data storage array (20). m-bit bytes of codeword data (25) are output from each filled second storage byte to provide successive m-bit bytes of codeword data. The use of a multistage approach in packing variable length codewords substantially reduces the complexity as compared to single stage designs.

摘要翻译： 可变长度码字封隔器（图3）以连续的m位字节传送码字数据。 二进制和被累积（86），表示随时间接收的码字比特的总数。 字节指针（90）从二进制和的至少一个最高有效位导出。 位指针（92）从二进制和的多个最低有效位导出。 第一数据存储阵列（20）具有多个m位第一存储字节，并且响应于字节指针用于在第一存储字节中存储接收的码字数据。 第二数据存储阵列（22）具有多个m位第二存储字节，并响应于字节和比特指针，用于用来自第一数据存储阵列（20）的码字数据填充第二存储字节。 从每个填充的第二存储字节输出码字数据（25）的m位字节以提供码字数据的连续m位字节。 与单级设计相比，使用多级方法来填充可变长度码字大大降低了复杂度。

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

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

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

IPC分类号： H04N7/137 ,  H04N7/13

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。

公开(公告)号：EP0617518A3

公开(公告)日：1995-08-30

申请号：EP94104591.6

申请日：1994-03-23

申请人： GENERAL INSTRUMENT CORPORATION OF DELAWARE

发明人： Derovanessian, Henry ,  Liu, Vincent

IPC分类号： H03M7/40

CPC分类号： H03M7/40

摘要： A variable length codeword packer (Fig. 3) communicates codeword data in successive m-bit bytes. A binary sum is accumulated (86) indicative of a total number of codeword bits received over time. A byte pointer (90) is derived from at least one most significant bit of the binary sum. A bit pointer (92) is derived from a plurality of least significant bits of the binary sum. A first data storage array (20) has a plurality of m-bit first storage bytes and is responsive to the byte pointer for storing received codeword data in the first storage bytes. A second data storage array (22) has a plurality of m-bit second storage bytes and is responsive to the byte and bit pointers for filling the second storage bytes with codeword data from the first data storage array (20). m-bit bytes of codeword data (25) are output from each filled second storage byte to provide successive m-bit bytes of codeword data. The use of a multistage approach in packing variable length codewords substantially reduces the complexity as compared to single stage designs.