Speech coding method, wideband speech coding method, speech coding apparatus, wideband speech coding apparatus, speech coding program, wideband speech coding program, and recording medium storing these programs

摘要

PPROBLEM TO BE SOLVED: To perform encoding with high quality by reducing the encoding noise generated by an encoder mismatch with a low amount of operations in communication of VoIP and the like. PSOLUTION: Basic noise signal encoding processing to encode a speech signal by a waveform encoding system and to send out a base code, basic noise signal extraction processing to extract the encoded noise from the basic code encoded by the basic encoding processing as a basic noise signal, high-frequency weighting processing to impart a fixed high-frequency weight to the basic noise signal extracted by the basic noise signal extraction processing, and quality extension encoding processing to generate an extension code by encoding the basic noise signal subjected to the high-frequency weighting processing are performed. PCOPYRIGHT: (C)2006,JPO&NCIPI