Patent ID: 9275650
Filing Date: 2016-03-01
CPC Classification: G10L

Claim Text:
1. A hybrid audio decoder configured to decode a coded stream while switching between a speech coding mode in which linear prediction coefficients are used and an audio coding mode in which a low delay orthogonal transform is used, the hybrid audio decoder comprising: a processor; and storage coupled to the processor, wherein the processor is configured to perform: low delay decoding for decoding a coded signal in the audio coding mode using an inverse modified discrete cosine transform filter bank; generating of a synthesized signal based on the low delay decoding; audio decoding for decoding, in the speech coding mode, a coded signal including the linear prediction coefficients; generating of an audio synthesized signal based on the audio decoding; decoding of a signal of a portion of a current frame to be decoded, using a signal of a previous frame preceding the current frame; and combining of the decoded signal of the portion of the current frame and the audio synthesized signal of another portion of the current frame, to reconstruct a signal of the current frame, when the current frame is a frame to be decoded immediately before the audio coding mode is switched to the speech coding mode, wherein, in the low delay decoding, an extended frame is windowed in a plurality of short windows each having a shorter length than a frame, and the inverse modified discrete cosine transform filter bank is applied to the extended frame, the extended frame being generated by combining the current frame and the previous frame.