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    • 52. 发明授权
    • Apparatus and method for encoding and decoding enhancement layer
    • 增强层编码和解码的装置和方法
    • US08498875B2
    • 2013-07-30
    • US12673536
    • 2008-08-18
    • Jongmo SungDo-Young Kim
    • Jongmo SungDo-Young Kim
    • G10L21/00
    • G10L19/24G10L19/002
    • Provided is a method and apparatus for encoding and decoding an enhancement layer to reduce quantization error in a G.711 codec. Exponent indices of additional mantissa information of each sample are calculated based upon exponent information of each sample in a frame. A process of allocating 1 bit to each sample with a current exponent index is repeated, the exponent index starting from the maximum value while decreasing by 1 at every repetition until the total number of bits allocated to the samples is equal to the total number of available bits in the frame. And the most significant bits, as many as the number of bits allocated to each sample, are extracted from the additional mantissa information of each sample in the frame.
    • 提供了一种用于对增强层进行编码和解码以减少G.711编解码器中的量化误差的方法和装置。 基于帧中每个样本的指数信息计算每个样本的额外尾数信息的指数索引。 重复以当前指数索引为每个样本分配1位的过程,指数指数从最大值开始,同时每次重复减少1,直到分配给样本的总位数等于可用总数 帧中的位。 并且从帧中的每个样本的附加尾数信息中提取与分配给每个样本的位数一样多的最高有效位。