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    • 108. 发明授权
    • Transformation coding apparatus
    • 变换编码装置
    • US5715004A
    • 1998-02-03
    • US757871
    • 1996-11-27
    • Kang-wook ChunByeungwoo Jeon
    • Kang-wook ChunByeungwoo Jeon
    • G06T9/00H03M7/30H04N19/107H04N19/154H04N19/176H04N19/196H04N19/423H04N19/503H04N19/51H04N19/60H04N19/61H04N19/625H04N19/85H04N19/91H04N7/50
    • H04N19/649
    • A transformation coding apparatus for transforming blocks of data corresponding to a boundary of an object. The apparatus includes a transformer for transforming an input block and producing transformation coefficients, a transformation coefficient selector for selecting and outputting certain transformation coefficients based on the transformation coefficients and the input block, an inverse transformer for inversely transforming the transformation coefficients selected by the transformation coefficient select means, and outputting a restored block, and an encoder for variable-length-coding the select coefficients selected by the transformation coefficient select means. A repetition controller calculates a mean square error of the input data block and the restored data block, compares, the calculated mean square error with a predetermined reference value, and determines whether to continue selecting coefficients. The transformation coding apparatus selects the coefficients which maximize the ratio of the mean square error .DELTA.MSE(k), to thereby enhance the quality of the picture and reduce the amount of necessary data bits.
    • 一种变换编码装置,用于变换对应于对象边界的数据块。 该装置包括用于变换输入块并产生变换系数的变压器,用于基于变换系数和输入块选择并输出某些变换系数的变换系数选择器,用于逆变换由变换系数选择的变换系数的逆变换器 选择装置,并输出恢复的块,以及编码器,用于对由变换系数选择装置选择的选择系数进行可变长度编码。 重复控制器计算输入数据块和恢复的数据块的均方误差,将计算的均方误差与预定参考值进行比较,并确定是否继续选择系数。 变换编码装置选择最大化均方误差DELTA MSE(k)的比率的系数,从而提高图像的质量并减少必要的数据比特量。
    • 109. 发明授权
    • Error concealment method and apparatus of audio signals
    • 音频信号错误隐藏方法和装置
    • US5673363A
    • 1997-09-30
    • US575522
    • 1995-12-20
    • Byeungwoo JeonJechang Jeong
    • Byeungwoo JeonJechang Jeong
    • G10L13/04G10L13/00G10L19/00H03M13/00H04B1/66G10L5/02G10L3/00
    • G10L19/005H04B1/667Y10S707/99945Y10S707/99948
    • An apparatus for concealing a frame or multiple of frames where errors have occurred in a digital audio signal which is subband coded and transform coded in units of an error-correctable frame is described. The error concealment apparatus includes an error detector for receiving frequency coefficients representing the encoded digital audio signal and detecting whether an error has occurred for each frame, and a decoder for decoding the frequency coefficients by respective subbands to form a frequency domain of the whole audio signal with respect to the input frequency coefficients. A buffer stores the frequency coefficients decoded by said decoder. Frequency coefficients of a frame or multiple of frames where errors have occurred are reconstructed using predetermined weight values and frequency coefficients of adjacent frames which do not have errors. Once reconstructed, the newly constructed frequency coefficients of the error frames are stored in the buffer also as to update the decoded coefficients stored therein corresponding to the error frames. The contents of the buffer are sent to a synthesis filter bank for converting the frequency coefficients into an audio signal of a time domain, in the same sequence as a decoding sequence.
    • 描述了一种用于隐藏以可纠错帧为单位进行子带编码和变换编码的数字音频信号中发生错误的帧或多个帧的装置。 错误隐藏装置包括:误差检测器,用于接收表示编码数字音频信号的频率系数,并检测每个帧是否发生错误;解码器,用于通过各个子带对频率系数进行解码,以形成整个音频信号的频域 相对于输入频率系数。 缓冲器存储由所述解码器解码的频率系数。 使用预定的权重值和没有错误的相邻帧的频率系数来重建发生错误的帧的帧或多个帧的频率系数。 一旦重建,新构造的误帧的频率系数也被存储在缓冲器中,以便更新对应于错误帧的存储在其中的解码系数。 将缓冲器的内容发送到合成滤波器组,以与解码序列相同的顺序将频率系数转换成时域的音频信号。
    • 110. 发明授权
    • Variable length encoding/decoding apparatus using re-association of
symbol-codeword for variable length code table
    • 可变长度编码/解码装置,使用可变长度码表的符号码字重新关联
    • US5999111A
    • 1999-12-07
    • US563018
    • 1995-11-27
    • Juha ParkByeungwoo JeonJechang Jeong
    • Juha ParkByeungwoo JeonJechang Jeong
    • H04N7/32H03M7/46H03M7/40
    • H03M7/46
    • A variable length encoding/decoding apparatus using symbol-codeword re-association of a variable length code table includes a re-associator for storing symbol-address assignment information, address-codeword assignment information and address-counter-value assignment information, altering the symbol-address assignment information and the address-counter value assignment information according to the varied counter value due to the symbol identifying and outputting a variable length code table in which a symbol-codeword is re-associated to the encoder/decoder apparatus, and a controller for producing the initialized counter values based on probabilities of symbol occurrences belonging to the pre-defined variable length code table and the information stored in the re-associator based on the pre-defined updating unit, and storing the symbol-codeword re-associated variable length code table every predetermined updating unit in the encoder/decoder. A data compression efficiency can be improved even though global statistics corresponding to the pre-defined variable length code table and local statistics of the symbols/codewords which are actually variable-length-encoded/decoded do not match each other. Since it is not necessary to transmit the symbol-codeword re-association information at the encoding end to a decoding end, threre is no additional data to be transmitted by employing the present invention.
    • 使用可变长度码表的符号 - 码字重新关联的可变长度编码/解码装置包括用于存储符号地址分配信息,地址码字分配信息和地址 - 计数器值分配信息的重新关联器,改变符号 由于符号识别而根据变化的计数器值地址分配信息和地址 - 计数器值分配信息,并输出其中符号码字被重新关联到编码器/解码器装置的可变长度码表,以及控制器 用于基于预定义的可变长度代码表的符号出现的概率和基于预定义的更新单元存储在重新关联器中的信息来产生初始化的计数器值,以及存储符号码字重新相关变量 编码器/解码器中的每个预定更新单元的长度代码表。 即使与预定义的可变长度代码表相对应的全局统计信息和实际上可变长度编码/解码的符号/码字的本地统计信息彼此不匹配,也可以提高数据压缩效率。 由于不需要将编码结束处的符号 - 码字重新关联信息发送到解码端,所以采用本发明不需要发送附加数据。