TRANSITION FROM A TRANSFORM CODING/DECODING TO A PREDICTIVE CODING/DECODING

摘要

Methods and apparatus are provided for coding and decoding a digital audio signal. Decoding includes: decoding according to an inverse transform decoding of a previous frame of samples of the digital signal, which is received and coded according to a transform coding; and decoding according to a predictive decoding of a current frame of samples of the digital signal, which is received and coded according to a predictive coding. The predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame. At least one state of the predictive decoding is reinitialized to a predetermined default value, and an add-overlap step combines a signal segment synthesized by predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.

主权项

1. A decoding method for decoding a digital audio signal, comprising the following acts performed by a decoding device:
receiving the digital audio signal; decoding according to an inverse transform decoding of a previous frame of samples of the digital signal, received and coded according to a transform coding; decoding according to a predictive decoding of a current frame of samples of the digital signal, received and coded according to a predictive coding, wherein the predictive decoding of the current frame is a transition predictive decoding which does not use any adaptive dictionary arising from the previous frame; reinitializing at least one state of the predictive decoding to a predetermined default value; and an overlap-add act, which combines a signal segment synthesized by the predictive decoding of the current frame and a signal segment synthesized by inverse transform decoding, corresponding to a stored segment of the decoding of the previous frame.