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Method and device for coding and decoding
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An encoding method and decoding method technology, applied in the field of encoding and decoding methods and devices, can solve the problems of large signal restoration distortion, high decoding complexity, and dependence on prediction effectiveness, and achieve the effect of avoiding operations and reducing complexity
Active Publication Date: 2010-03-17
HUAWEI TECH CO LTD +1
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[0008] In the process of realizing the present invention, the inventor found that: the prediction effectiveness of the time-domain inter-channel prediction technology depends on the correlation between the left and right channels, and the restoration distortion of the signal with rich stereo information is relatively large
However, because parametric stereo technology performs audio coding in the frequency domain, complex operations such as Fourier transform are required, so the most prominent problem in parametric stereo technology is the introduction of additional delay, and the complexity of decoding is relatively high.
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Embodiment 2
[0067] In Embodiment 2, the channels to be encoded are multiple (greater than two) input channels
[0068] In the second embodiment, the description is made by taking four channels of input channel signals as an example, and the four channels of input channel signals are respectively set as A, B, C, and D. Moreover, in this embodiment, the segment that has the greatest correlation with each segment of the estimated channel segment signal in the estimated channel segment signal is also used as an example, and the linear regression estimation is taken as an example for description .
[0069] First, one of the four input channel signals needs to be selected as the estimated channel signal, and then the other three input channel signals are used as estimated channel signals. Here, the input channel signal A is selected as the estimated channel signal, and B, C, and D are all estimated channel signals. The specific process is as follows:
[0070] Step 11a is the same as that des...
Embodiment 3
[0081] Such as figure 2 As shown, the third decoding method in the embodiment of the present invention includes the following steps:
[0082] Step 21, analyzing the code stream to obtain an estimated parameter code stream and an estimated channel signal code stream.
[0083] According to the rule of encoding the estimated parameter bit stream and the estimated channel signal bit stream at the encoding end, the estimated parameter bit stream and the estimated channel signal bit stream are obtained by parsing the encoded bit stream.
[0084] Step 22: Using a decoding method corresponding to the encoding method at the encoding end, decode the estimated channel signal stream to obtain estimated channel segment signals.
[0085] Step 23. Decode the estimated parameter code stream to obtain a starting position parameter and an estimated parameter. Wherein, the starting position parameter is a starting position parameter corresponding to at least one segment in the estimated chann...
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Abstract
The invention provides a method and a device for coding and decoding, which relate to the technical field of audio coding and are invented for reducing the flexibility of multichannel compression coding and decoding and time delay. The coding method comprises: acquiring an estimation audio channel segmental signal of an estimation audio channel signal and an estimated audio channel segmental signal of an estimated audio channel signal; and determining at least one segment having relevance to the segments of the estimated audio channel segmental signal in the estimation audio channel segmentalsignal by using the estimation audio channel segmental signal and the estimated audio channel segmental signal; estimating the estimated audio channel segmental signal by using the segment having relevance in the estimation audio channel segmental signal to acquire an estimation parameter of the estimated audio channel segmental signal; coding an initial position parameter and an estimation parameter which correspond to the segment having relevance to generate an estimation parameter code stream; and coding the estimation audio channel segmental signal to generate an estimation audio channel signal code stream. The method and the device are mainly used in multichannel coding and decoding technology.
Description
technical field [0001] The present invention relates to the technical field of audio coding, in particular to a codec method and device. Background technique [0002] There are two main ways to obtain stereo signals: one is to obtain stereo signals through natural recording with dual microphones or multiple microphones, and the other is to obtain stereo signals through artificial mixing in an audio studio. Among them, in the first approach, the audio of each channel comes from the same audio scene. Except for the time difference and intensity difference caused by the different placement directions of the microphones, the audio information recorded by each microphone is basically the same, so the audio of each channel There is a strong correlation between them. In the second approach, in most cases, we strive to create a realistic audio scene, so there is also a strong correlation between the audio channels. Therefore, related technologies for reducing the code rate of mult...
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