Speech/audio bitstream decoding method and apparatus
First Claim
1. An audio bitstream decoding method implemented by a decoder, comprising:
- acquiring, by a network interface of the decoder, a decoding parameter of a frame from an input audio bitstream, wherein the frame is a redundant decoded frame that is recovered based on redundant bitstream information from another frame when the frame is a lost frame, or a previous frame adjacent to the frame that is a redundant decoded frame, and the decoding parameter comprises an adaptive codebook gain;
adjusting, by a processor of the decoder, the adaptive codebook gain of the frame according to a signal class, an algebraic codebook gain, or an adaptive codebook gain of X frames of the audio bitstream, to obtain an adjusted adaptive codebook gain of the frame, wherein the X frames comprise M frames previous to the frame and/or N frames next to the frame, and wherein X, M and N are positive integers;
recovering, by the processor of the decoder, a signal of the frame according to the adjusted adaptive codebook gain of the frame; and
outputting an audio signal synthesized according to the recovered signal.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention disclose a speech/audio bitstream decoding method including: acquiring a speech/audio decoding parameter of a current speech/audio frame, where the foregoing current speech/audio frame is a redundant decoded frame or a speech/audio frame previous to the foregoing current speech/audio frame is a redundant decoded frame; performing post processing on the acquired speech/audio decoding parameter according to speech/audio parameters of X speech/audio frames, where the foregoing X speech/audio frames include M speech/audio frames previous to the foregoing current speech/audio frame and/or N speech/audio frames next to the foregoing current speech/audio frame; and recovering a speech/audio signal by using the post-processed speech/audio decoding parameter of the foregoing current speech/audio frame. The technical solutions of the present invention help improve quality of an output speech/audio signal.
51 Citations
17 Claims
-
1. An audio bitstream decoding method implemented by a decoder, comprising:
-
acquiring, by a network interface of the decoder, a decoding parameter of a frame from an input audio bitstream, wherein the frame is a redundant decoded frame that is recovered based on redundant bitstream information from another frame when the frame is a lost frame, or a previous frame adjacent to the frame that is a redundant decoded frame, and the decoding parameter comprises an adaptive codebook gain; adjusting, by a processor of the decoder, the adaptive codebook gain of the frame according to a signal class, an algebraic codebook gain, or an adaptive codebook gain of X frames of the audio bitstream, to obtain an adjusted adaptive codebook gain of the frame, wherein the X frames comprise M frames previous to the frame and/or N frames next to the frame, and wherein X, M and N are positive integers; recovering, by the processor of the decoder, a signal of the frame according to the adjusted adaptive codebook gain of the frame; and outputting an audio signal synthesized according to the recovered signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A decoder for decoding an audio bitstream, comprising:
- a memory storing instructions, and a processor coupled to the memory to executes the instructions, the processor configured to;
acquire, via an interface, a decoding parameter of a frame from the audio bitstream, wherein the frame is a redundant decoded frame that is recovered based on redundant bitstream information from another frame when the frame is a lost frame, or a previous frame adjacent to the frame that is a redundant decoded frame, and wherein the decoding parameter comprises an adaptive codebook gain; adjust the adaptive codebook gain of the frame according to a signal class, an algebraic codebook gain, or an adaptive codebook gain of X frames of the audio bitstream when the frame is a redundant decoded frame or a previous frame adjacent to the frame is a redundant decoded frame, to obtain an adjusted adaptive codebook gain of the frame, wherein the X frames comprise M frames previous to the frame and/or N frames next to the frame, and wherein X, M and N are positive integers; recover a signal of the frame according to the adjusted adaptive codebook gain of the frame; and output, via the interface, an audio signal synthesized according to the recovered signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- a memory storing instructions, and a processor coupled to the memory to executes the instructions, the processor configured to;
Specification