LPC-HARMONIC VOCODER WITH SUPERFRAME STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an improved low-bit rate parametric voice coder which groups a number of frames from an underlaying frame-based vocoder such as MELP into a superframe structure. SOLUTION: Parameters are extracted from the group of underlying frames and quantized into the superframe. According to this, the bit rate of the underlying coding can be reduced without increasing distortion. Speech data coded in the superframe structure can then be directly synthesized to speech or may be transcoded to a format such that an underlying frame-based vocoder performs synthesis. The superframe structure includes additional error detection and correction data to reduce the distortion caused by the communication of bit errors. COPYRIGHT: (C)2011,JPO&INPIT