Audio coding device, audio coding method, audio coding program, audio decoding device, audio decoding method, and audio decoding program

摘要

An objective of the present invention is, when packet loss occurs in audio coding, to recover audio quality without increasing algorithm delay. An audio signal transmission device which codes an audio signal comprises an audio coding unit which codes an audio signal, and a supplemental information coding unit which, from a prefetch, computes and codes supplemental information. Conversely, an audio signal receiving device which decodes the audio coding and outputs the audio signal comprises: an audio coding buffer which detects packet loss on the basis of a receiving state of an audio packet; an audio parameter decoding unit which decodes the audio coding upon successful receipt of the audio packet; a supplemental information decoding unit which decodes the supplemental information coding upon successful receipt of the audio packet; a supplemental information accumulation unit which accumulates supplemental information which is obtained by decoding supplemental information coding; an audio parameter loss processing unit which outputs an audio parameter when the audio packet loss is detected; and an audio compositing unit which composites the decoded audio from the audio parameter.