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    • 3. 发明申请
    • METHOD AND APPARATUS FOR LOW RATE CODING AND DECODING
    • 低速编码和解码的方法和装置
    • WO1996034383A1
    • 1996-10-31
    • PCT/US1996003235
    • 1996-03-07
    • MOTOROLA INC.ASHLEY, James, PatrickPENG, WeiminZHANG, Peng
    • MOTOROLA INC.
    • G10L09/18
    • G10L19/038
    • A system for low rate coding or decoding includes the use of a mode indicator in the coded signal to indicate whether prequantizer (i.e., coarse) or quantizer (i.e., fine) information is being sent. In a transmitter (300) embodiment both a prequantizer (212) and a restricted quantizer (214) search is performed of predefined prequantizer ("P") and quantizer ("V") codewords, respectively, to determine the codewords with the least residual energy. The index of the P or V codeword with the least residual is then determined (220), and this index is transmitted along with an appropriate P or V mode indicator. In a receiver (330) embodiment, the mode indicator is used to set the decoder (e.g., a vocoder) (350) to form a signal replica from a P codeword (determined from the transmitted index), or from a V codeword (from the transmitted V index) and previously determined P codeword (e.g., the centroid of the V codeword).
    • 用于低速率编码或解码的系统包括在编码信号中使用模式指示符来指示是否正在发送预量化器(即,粗略)或量化器(即,精细)信息。 在发射机(300)实施例中,分别对预定义的量化器(“P”)和量化器(“V”)码字执行预量化器(212)和限制量化器(214)搜索,以确定具有最小残差的码字 能源。 然后确定具有最小残差的P或V码字的索引(220),并且该索引与适当的P或V模式指示符一起发送。 在接收机(330)实施例中,模式指示符用于设置解码器(例如,声码器)(350)以从P码字(从传送的索引确定)或从V码字(来自 发送的V索引)和先前确定的P码字(例如,V码字的质心)。