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

摘要

An audio packet error concealment system includes an encoding unit for encoding an audio signal consisting of a plurality of frames, and an auxiliary information encoding unit for estimating and encoding auxiliary information about a temporal change of power of the audio signal. The auxiliary information is used in packet loss concealment in decoding of the audio signal. The auxiliary information about the temporal change of power may contain a parameter that functionally approximates a plurality of powers of subframes shorter than one frame, or may contain information about a vector obtained by vector quantization of a plurality of powers of subframes shorter than one frame.

主权项

1. An audio encoding device for encoding an audio signal consisting of a plurality of frames, the encoding device comprising:
a processor; an audio encoding unit executable by the processor to encode the audio signal; and an auxiliary information encoding unit executable by the processor to estimate and encode auxiliary information about a temporal change of power of the audio signal, the auxiliary information used in packet loss concealment in decoding of the audio signal, wherein the auxiliary information encoding unit estimates and encodes a flag of sudden change of power, as the auxiliary information, when the flag indicates a predetermined mode, the auxiliary information encoding unit further estimates and encodes quantized transient power, as the auxiliary information, and when the flag does not indicate the predetermined mode, the auxiliary information encoding unit does not include quantized transient power in the auxiliary information.