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Audio encoding apparatus and method thereof, audio decoding device and method thereof

A technology of sound encoding and encoding devices, applied in the field of sound encoding and decoding

Active Publication Date: 2008-10-01
BEJING ANGEL VOICE DIGITAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] It can be seen that in the low bit rate coding application of digital sound, the existing EAAC+ technology and AMR-WB+ technology have certain defects in terms of coding quality and complexity.

Method used

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  • Audio encoding apparatus and method thereof, audio decoding device and method thereof
  • Audio encoding apparatus and method thereof, audio decoding device and method thereof
  • Audio encoding apparatus and method thereof, audio decoding device and method thereof

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Embodiment approach

[0344] Encoding mode selection implementation method 1: Use three encoding modes to encode and decode the low-frequency sub-band domain excitation spectrum in the two channels with the same number of bits, and calculate and decode the low-frequency sub-band domain excitation spectrum in the two channels recovered. The error between the excitation spectrum of the band domain and the excitation spectrum of the low-frequency sub-band domain before encoding is used, and the encoding mode with the smallest error is selected as the encoding mode of stereo encoding. Output the encoding mode selection information as side information to the bit stream multiplexing module 1407;

[0345] Coding mode selection implementation method 2: For the lower frequency sub-bands whose frequency in the low-frequency sub-band domain is lower than a certain value, such as sub-bands below 1kHz, use the sum-difference stereo coding mode and the parametric stereo coding mode to encode and decode respective...

Embodiment approach 1

[0354] The specific implementation method 1 of parametric stereo coding comprises the following steps:

[0355] Step 35-1a: In the sub-band k, for a certain channel, such as the right channel Calculate the weighting parameter g for this channel r (k), and get the scaled excitation spectrum of the channel R → ′ = 1 g r ( k ) R → , making the scaled and The energy is equal; g r (k) can be calculated using the following formula:

[0356] g r ( k ) = E R ( k ) ...

Embodiment approach 1

[0365] Compared with the specific implementation method 1, the parameter g in the specific implementation method 2 of the parametric stereo coding r (k), g d (k) and the weighted sum excitation spectrum It is calculated according to the principle of minimum error, including the following steps:

[0366] Step 35-2a: For sub-band k, calculate the first parameter g according to the following formula d (k):

[0367] g d ( k ) = - b ( k ) + b 2 ( k ) + a 2 ( k ) ...

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Abstract

The invention discloses a single acoustic path sound coding device using an analysis sub-band filter set module to decompound a single acoustic path sound signal into a low-frequency sub-band domain signal comprising at least two sub-bands and a high-frequency sub-band domain signal comprising at least two sub-bands; the low-frequency sub-band domain signal is performed with prediction analysis by a low-frequency sub-band domain time-varying prediction analysis module, is performed with time domain transformation by a low-frequency sub-band domain time-frequency transformation module, and is performed with quantification coding by a low-frequency sub-band domain waveform coding module so as to obtain low-frequency sub-band domain waveform coding data; high-frequency sub-band domain parameter coding data is extracted from the high-frequency sub-band domain signal by parameter coding of a high-frequency sub-band domain parameter coding module; the low-frequency sub-band domain waveform coding data and the high-frequency sub-band domain parameter coding data are multiplexed by a bit-stream multiplexing module to output a sound code stream. The invention also discloses a single acoustic path sound decoding device, a single acoustic path sound coding / decoding method, a dimensional sound coding / decoding device and method, all of which can realize high-quality coding of wide band sound in a low code rate.

Description

technical field [0001] The present invention relates to sound coding and decoding technology, in particular to a monophonic sound encoding device and its method, a monophonic sound decoding device and its method, a stereo sound encoding device and its method, and a stereo sound decoding device and its method . Background technique [0002] At present, the wideband high-quality compression coding technology adopts the waveform coding technology. Waveform coding techniques are roughly divided into three categories: predictive coding, subband coding, and transform coding. Among them, the predictive coding changes the actual value of the transmitted sound signal into the transmission error value, and can express the sound signal with fewer coding bits. Sub-band coding divides the sound signal into several consecutive sub-bands, and then the signal on each sub-band can be encoded with a separate coding scheme. to reduce the quantization error. Transform coding transforms the ...

Claims

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Application Information

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IPC IPC(8): G10L19/02G10L19/04G10L19/008G10L19/032
Inventor 潘兴德徐恒宇李靓
Owner BEJING ANGEL VOICE DIGITAL TECH
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