Encoding and decoding method, encoding device and decoding device of stereo signal
A coding method and stereo technology, applied in the fields of decoding method, stereo signal coding, coding device and decoding device, can solve problems such as large distortion, high distortion deviation ratio, and reduced stereo signal quality
Active Publication Date: 2022-07-12
HUAWEI TECH CO LTD
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[0005] In this process, the decoder directly uses the quantized LSF parameters of the main channel signal as the quantized LSF parameters of the secondary channel signal, which will lead to large distortion of the quantized LSF parameters of the secondary channel signal, resulting in a large distortion deviation. The frame ratio is high, reducing the quality of the decoded stereo signal
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[0072] The technical solutions in the present application will be described below with reference to the accompanying drawings.
[0073] figure 1 A schematic structural diagram of a stereo encoding and decoding system in the time domain provided by an exemplary embodiment of the present application is shown. The stereo codec system includes an encoding component 110 and a decoding component 120 .
[0074] It should be understood that the stereo signal involved in this application may be an original stereo signal, a stereo signal composed of two signals contained in a multi-channel signal, or a combination of multi-channel signals contained in a multi-channel signal. The resulting stereo signal consists of two signals.
[0075] The encoding component 110 is used to encode the stereo signal in the time domain. Optionally, the encoding component 110 may be implemented through software; alternatively, it may also be implemented through hardware; or, it may also be implemented th...
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The present application provides an encoding method, a decoding method, an encoding apparatus, and a decoding apparatus of a stereo signal. The encoding method includes: determining a target adaptive expansion factor according to the quantized LSF parameter of the main channel signal of the current frame and the LSF parameter of the secondary channel signal of the current frame; after quantizing the main channel signal of the current frame The LSF parameters and the target adaptive spreading factor are written into the code stream. The encoding method, decoding method, encoding device, and decoding device of a stereo signal provided by the present application help to reduce the distortion degree of the LSF parameter after quantization of the secondary channel signal, thereby helping to reduce the occurrence of frames with large distortion deviation. Proportion.
Description
technical field [0001] The present application relates to the audio field, and more particularly, to encoding, decoding methods, encoding apparatuses and decoding apparatuses of stereo signals. Background technique [0002] In a time-domain stereo coding method, the coding end first estimates the inter-channel time delay difference on the stereo signal, and performs time-delay alignment according to the estimation result, and then performs time-domain downmix processing on the signal after the time-delay alignment processing. Finally, the main channel signal and the secondary channel signal obtained by the downmix processing are encoded respectively to obtain an encoded code stream. [0003] The encoding of the primary channel signal and the secondary channel signal may include: determining a linear prediction coefficient (line prediction coefficient, LPC) of the primary channel signal and the LPC of the secondary channel signal, and converting the The LPC and the LPC of th...
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IPC IPC(8): G10L19/008H04S1/00
CPCG10L19/008H04S1/00G10L19/07G10L19/167G10L19/038G10L19/06G10L19/032
Inventor 艾雅·苏谟特乔纳森·阿拉斯泰尔·吉布斯李海婷
Owner HUAWEI TECH CO LTD