Acoustic decoding device and method thereof

A decoding method and a sound coding technology, which are applied in the field of sound decoding devices and can solve problems such as increasing the computational complexity of the decoder

Active Publication Date: 2014-10-01
BEJING ANGEL VOICE DIGITAL TECH
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Problems solved by technology

The entire decoder needs three time-frequency/frequency-time transformatio

Method used

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  • Acoustic decoding device and method thereof
  • Acoustic decoding device and method thereof
  • Acoustic decoding device and method thereof

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0021] In order to better understand the principles of the present invention, it is necessary to introduce Modified Discrete Fourier Transform (MDFT), Modified Discrete Cosine Transform (MDCT), Modified Discrete Sine Transform (MDST) and their inverse transform as well as the relationship between them.

[0022] First, the case of MDFT transformation is introduced. Select the time-domain signals of M samples in the previous frame and M samples in the current frame, and then perform windowing operation on the time-domain signals of the two frames with a total of 2M samples, and then perform MDFT transformation on the windowed signals to obtain M spectral coefficients. The calculation formula of MDFT transform is:

[0023] X ( k ) = Σ...

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Abstract

The invention relates to an acoustic decoding method. The method comprises the following steps: demultiplexing an acoustic code stream to obtain low-frequency waveform code data and high-frequency parameter code data; decoding the low-frequency waveform code data to obtain low-frequency spectrum data in an MDCT domain; converting the low-frequency spectrum data in the MDCT domain into an MDFT domain; mapping part of the spectrum data in the low-frequency spectrum data in the MDFT domain to the high-frequency part; conducting parameter decoding on the mapped high-frequency spectrum data according to the high-frequency parameter code data; combining the low-frequency spectrum data in the MDCT domain and the high-frequency spectrum data subjected to parameter decoding in the MDFT domain to form full-frequency spectrum data in the MDFT domain, and finally obtaining acoustic decoding data in a time domain through IMDFT. By means of the acoustic decoding method, an MDFT low frequency spectrum is directly calculated through an MDCT low frequency spectrum, conversion between IMDCT and MDFT is avoided, errors caused by introduction of low-frequency MDFT estimation during MDFT frequency-time domain transformation are avoided by splicing the low-frequency DMCT spectrum and a high-frequency MDFT spectrum into a full-frequency-band MDFT spectrum, computation complexity and computation errors of a decoder are reduced on the premise of maintaining coding quality.

Description

technical field [0001] The present invention relates to audio decoding, in particular to an audio decoding device and method thereof. Background technique [0002] A prior art sound decoding device and method, comprising: [0003] The bit stream demultiplexing module is used to demultiplex the received audio coded stream, obtain the coded data and side information of the corresponding data frame, output the corresponding coded data and side information to the low frequency waveform decoding module, and send the high frequency parameter The decoding module and the frequency-time mapping module output corresponding side information; [0004] The low-frequency waveform decoding module is used to decode the low-frequency waveform encoded data of the frame, and perform redundant inverse processing on the decoded data according to the redundant processing side information to obtain low-frequency decoded data; [0005] The low-spectrum-to-high-spectrum mapping module is used to m...

Claims

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Application Information

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IPC IPC(8): G10L19/24
Inventor 吴超刚潘兴德
Owner BEJING ANGEL VOICE DIGITAL TECH
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