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Method and device for MDCT domain signal energy and phase compensation

A phase compensation and signal energy technology, applied in speech analysis, instruments, etc., can solve problems such as difficulty in spatial parameters, energy jitter, and inability to correctly reflect the difference in signal energy between the left and right channels.

Inactive Publication Date: 2009-09-02
WUHAN UNIV
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Problems solved by technology

[0008] MDCT is a real transformation. There are two difficulties in the extraction of stereo space parameters based on MDCT domain: First, after MDCT transformation, there is energy jitter, which leads to inconsistent energy of space parameters before and after transformation.
For example, the ILD that records the energy information of the left and right channels, if the input signal undergoes MDCT transformation and generates energy jitter, then the ILD cannot correctly reflect the energy difference between the left and right channel signals
Second, MDCT spectral lines do not have direct phase information, making it difficult to extract spatial parameters with phase

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  • Method and device for MDCT domain signal energy and phase compensation
  • Method and device for MDCT domain signal energy and phase compensation
  • Method and device for MDCT domain signal energy and phase compensation

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[0068] See attached figure 2 , the MDCT domain signal energy and phase compensation method provided by the present invention completes the transformation from MDCT spectrum to MDST spectrum under low complexity. And, by introducing MDST spectrum and combining with MDCT spectrum, MDFT spectrum with constant energy and linear phase is constructed. Finally, in the MDCT domain, the spatial parameters equivalent to the time domain signal are extracted. The MDCT domain signal energy and phase compensation method includes the following steps:

[0069] Step 1, perform MDCT transformation on the input signal to obtain the MDCT spectrum X of each frame signal i , MDCT spectrum X of the previous frame i-1 , and the next frame MDCT spectrum X i+1 . In audio signal processing, the processing is always divided into frames. When the current frame is the i-th frame, the previous frame is the i-1-th frame, and the next frame is the i+1-th frame. In specific implementation, X is calculat...

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Abstract

The invention provides a method and a device for MDCT domain signal energy and phase compensation. By analyzing the relationship between an MDCT transform radix and an MDST transform radix and by using the sparse approximation matrix, the transformation matrix of the MDCT to the MDST is extracted and simplified; the transformation of an MDCT spectrum to an MDST spectrum is realized by using the transformation matrix, and an MDFT spectrum with constant energy and linear phase is formed by combining the MDCT spectrum and the MDST spectrum; and the spatial parameters are extracted according to the MDCT spectrum. The invention effectively solves the problems of field wobbling and phase deletion of the signal in the MDCT domain and realizes the extraction and synthesis of the spatial parameters in the MDCT domain with low complexity in the spatial audio coding system.

Description

technical field [0001] The invention belongs to the technical field of spatial audio, and in particular relates to a method and a device for compensating energy and phase of an MDCT domain signal. Background technique [0002] The traditional audio coding technology encodes each channel independently, which is suitable for mono-channel coding. In multi-channel stereo coding, using traditional audio coding technology, the bit rate will increase linearly with the number of channels. [0003] Spatial audio coding technology emerged to address the problems of traditional audio coding. The structure of the existing spatial audio coding and decoding system is shown in the attached figure 1 Shown: First, the input signal is subjected to sound source separation and downmixing at the encoding end. The spatial parameter extraction module extracts the spatial information of the sound field for the separated single sound source. Then, the extracted spatial information of the sound fi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/00
Inventor 胡瑞敏陈水仙陈冰陈琪
Owner WUHAN UNIV
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