Encoding method of multi-sound-track signal and encoder

A technology of multi-channel signal and encoding method, which is applied in the direction of instruments, stereo systems, voice analysis, etc., can solve the problems of discontinuity, jumping, frequent shaking of sound and image of mixed signals, and achieve the purpose of avoiding discontinuity between frames and maintaining phase Information, the effect of improving the quality of hearing

Active Publication Date: 2018-02-27
HUAWEI TECH CO LTD
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Problems solved by technology

[0008] In the process of stereo recording, affected by factors such as background noise, reverberation, and multiple people talking at the same time, the ITD calculated according to the existing PS encoding method often appears unstable (the value of ITD jumps back and forth) phenomenon
If the downmix signal is calculated based on such an ITD, the downmix signal will be discontinuous, resulting in poor stereo quality at the decoder, such as the stereo image played at the decoder will shake frequently, or even stutter in the sense of hearing

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  • Encoding method of multi-sound-track signal and encoder
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  • Encoding method of multi-sound-track signal and encoder

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[0036] It should be noted that a stereo signal may also be referred to as a multi-channel signal. The functions and meanings of ILD, ITD and IPD of multi-channel signals are briefly introduced above. For the sake of easy understanding, the signal picked up by the first microphone is taken as the first channel signal, and the signal picked up by the second microphone is The second channel signal is taken as an example, and the ILD, ITD, and IPD are described in more detail.

[0037] ILD describes the energy difference between the first channel signal and the second channel signal. For example, if ILD is greater than 0, it means that the energy of the first channel signal is higher than the energy of the second channel signal; if ILD is equal to 0, it means that the energy of the first channel signal is equal to the energy of the second channel signal; if ILD is less than 0, indicating that the energy of the first channel signal is less than the energy of the second channel sig...

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Abstract

The invention provides an encoding method of a multi-sound-track signal and an encoder. The encoding method comprises the steps of obtaining the multi-sound-track signal of a current frame; determining an initial ITD value of the current frame; controlling the quantity of target frames permitted to continuously occur according to characteristic information of the multi-sound-track signal, whereinthe characteristic information comprises at least one of signal-to-noise ratio parameters of the multi-sound-track signal and peak features of the mutual relation number of the multi-sound-track signal, and the ITD values of the target frames reuse the ITD value of the previous frames of the target frames; determining the ITD value of the current value according to the ITD value of the current frame and the quantity of the target frames permitted to continuously occur; encoding the multi-sound-track signal according to the ITD value of the current frame. The encoding quality of the multi-sound-track signal can be improved.

Description

technical field [0001] The present invention relates to the field of audio signal coding, and more specifically, to a multi-channel signal coding method and coder. Background technique [0002] As the quality of life improves, people's demand for high-quality audio continues to increase. Compared with monophonic signals, stereo has the sense of orientation and distribution of each sound source, which can improve the clarity, intelligibility and sense of presence of sound, so it is favored by people. [0003] Stereo processing technologies mainly include sum-difference (Mid / Sid, MS) coding, intensity stereo (Intensity Stereo, IS) coding, and parametric stereo (Parametric Stereo, PS) coding. [0004] Based on the correlation between channels, MS coding performs sum and difference transformations on the two signals, and the energy of each channel is mainly concentrated in the sum channel, so that the redundancy between channels can be removed. In the MS coding technology, the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/008G10L19/02H04S3/00
CPCG10L19/008G10L19/0204H04S3/00H04S2420/03G10L25/06
Inventor 李海婷刘泽新张兴涛苗磊
Owner HUAWEI TECH CO LTD
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