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Method for encoding and decoding stereo audio and encoder/decoder

A technology of stereo sound and coding method, applied in instruments, speech analysis, etc., can solve the problems of reduced code rate and distortion of intensity stereo coding method, and achieve the effect of ensuring coding gain and low code rate

Active Publication Date: 2009-01-21
HUAWEI TECH CO LTD +1
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Problems solved by technology

At this time, the existing sum-difference stereo coding method cannot bring the effect of bit rate reduction, while the intensity stereo coding method will introduce obvious distortion

Method used

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  • Method for encoding and decoding stereo audio and encoder/decoder
  • Method for encoding and decoding stereo audio and encoder/decoder
  • Method for encoding and decoding stereo audio and encoder/decoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1. A stereo audio coding method, such as image 3 shown, including:

[0033] A1. Obtain two corresponding vector speech signals belonging to the left sound channel and the right sound channel respectively.

[0034] The acquisition of the vector speech signals of the left and right channels can be carried out by referring to the existing method. Based on the auditory characteristics of the human ear, the left and right channels can be divided into several sub-bands according to frequency, and two vector speech signals belonging to the same sub-band of the left and right channels are obtained as corresponding vector speech signals . The basis for stereo audio processing in units of subbands is:

[0035] Human hearing can be described by a non-uniform bandwidth filter bank, and each filter bank channel is called a subband. The bandwidth of the sub-band matches the characteristics of human hearing. The human ear's sense of space for stereo mainly comes from t...

Embodiment 2

[0070] Embodiment 2. A stereo audio decoding method provides a decoding method corresponding to the encoding method in Embodiment 1. The process is as follows Figure 5 shown, including:

[0071] B1. Obtain a stereo audio encoding stream.

[0072] The coded code stream is the coded code stream obtained by using the coding method in the first embodiment.

[0073] B2. Obtain the information of the rotation angle from the encoded code stream.

[0074] The decoding party can read and decode the rotation angle θ from a certain field according to the agreement adopted by the encoding party.

[0075] B3. Obtain two rotation vector signals from the encoded code stream;

[0076] Decode to get two rotating vector signals Y 0 and Y 1 The process can correspond to Y 0 and Y 1 encoding method.

[0077] B4. Perform inverse orthogonal rotation transformation on the two rotation vector signals according to the rotation angle to obtain two vector speech signals.

[0078] i.e. equivale...

Embodiment 3

[0079] Embodiment 3. A stereo audio coding method. The difference between the method of this embodiment and Embodiment 1 is that before performing the orthogonal rotation transformation, a process of evaluating and judging the coding gain of the transformation is added. The method flow is as follows Figure 6 shown, including:

[0080] C1. Obtain two corresponding vector speech signals belonging to the left sound channel and the right sound channel respectively.

[0081] This step can be performed with reference to step A1 in the first embodiment.

[0082] C2. It is determined that an orthogonal rotation transformation needs to be performed on the two vector speech signals.

[0083] Since the purpose of performing orthogonal rotation transformation is to improve the correlation of the vector, the correlation of the current vector speech signal can be used as the basis for judgment, for example, the correlation of the two vector speech signals can be calculated, and when the ...

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Abstract

The invention discloses a stereo audio coding method, wherein vector speech signals of left and right sound channels are rotatablely orthogonally transformed, and the correlation degree between two vectors is increased. The invention further provides a corresponding stereo audio coding method and a stereo audio encoder / decoder. Because the two vectors which are transformed have an excellent correlation, higher sound quality can be achieved in a low bit rate during a process of subsequent coding, thereby guaranteeing to increase the coding gain. Compared with a conventional method, the stereo audio coding method can obtain higher sound quality in a same bit rate or achieve lower bit rate in a same sound quality.

Description

technical field [0001] The invention relates to the technical field of audio processing, in particular to a digital stereo audio encoding / decoding method and an encoding / decoding device. Background technique [0002] Stereo is a sound signal that gives the listener the impression that the sound source is distributed in space. Stereo audio is usually assigned to two separate channels during recording: the left channel and the right channel. During playback, the human ear generates auditory space by distinguishing the intensity difference, delay, etc. of the audio signals from the left and right channels. feel. [0003] Usually there are two main sources of stereo signals: one is to use dual microphones or multi-microphones for natural recording. At this time, the left and right channel audio comes from the same audio scene. Except for the time difference and intensity difference caused by the microphone placement, the audio information they record Basically the same; one is...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/008
Inventor 张树华窦维蓓张斌侯欢郭利斌王庭红肖玮
Owner HUAWEI TECH CO LTD
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