HYBRID SOUND-SIGNAL DECODER, HYBRID SOUND-SIGNAL ENCODER, SOUND-SIGNAL DECODING METHOD, AND SOUND-SIGNAL ENCODING METHOD

摘要

A hybrid sound-signal decoder that decodes a bit stream containing the following: audio frames encoded by an audio encoding process using a low-delay filter bank; and voice frames encoded by a voice encoding process using linear prediction coefficients. If the frame being decoded (the ith frame) is the first voice frame after a switch from audio frames to voice frames, subframes (1101 and 1102) that are signals corresponding to a pre-encoding (i-1)th frame are generated using a subframe (1001) that is a signal generated using a pre-encoding (i-1)th-frame signal, obtained by decoding the ith frame.