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Audio data encoding method and device

A technology of audio data and encoding method, applied in the multimedia field, can solve problems such as high time and space complexity, and great difficulty in implementing Ogg/Vorbis encoding, so as to reduce program space, reduce computational complexity and space complexity, The effect of reducing the amount of calculation

Active Publication Date: 2012-01-25
ACTIONS ZHUHAI TECH CO
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Problems solved by technology

[0007] It can be seen that the time and space complexity of the Ogg / Vorbis encoding operation process is very high. Therefore, it is very difficult to implement Ogg / Vorbis encoding in portable multimedia players with poor processing chip execution capabilities.

Method used

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  • Audio data encoding method and device

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Embodiment Construction

[0042] In view of the fact that it is very difficult to completely realize Ogg / Vorbis encoding in a portable multimedia player, in the embodiment of the present invention, in order to reduce the implementation complexity of Ogg / Vorbis encoding, the Ogg / Vorbis encoding process is properly optimized, specifically The steps are as follows: receiving audio data that needs to be encoded, performing an improved discrete cosine transform (MDCT) on the audio data, and then calculating a masking curve according to the MDCT transform result, and calculating a base curve by using a piecewise linear method according to the masking curve, and the spectral residual calculated according to the masking curve and the base curve, then performing channel coupling on the spectral residual, and performing vectorized calculation on the result of the channel coupling, and finally, the vectorized The data obtained after calculation is encoded according to the specified sampling rate and bit rate to ob...

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Abstract

The invention relates to a multimedia technique and discloses an audio data encoding method, which is used for reducing the complexity in realizing Ogg / Vorbis encoding in a portable multimedia player. On one hand, the method uses a newly designed masking curve to replace a tone masking curve and a noise masking curve calculated in the prior art and the calculated amount for Ogg / Vorbis encoding iseffectively reduced; and on the other hand, a designated adoption rate and a designated bit rate are used for encoding vectorized data and the program space occupied for Ogg / Vorbis encoding is effectively reduced. Therefore, the calculation complexity and the space complexity of Ogg / Vorbis encoding can be reduced and the Ogg / Vorbis encoding is realized in portable equipment. The invention additionally discloses an audio data encoding device.

Description

technical field [0001] The invention relates to multimedia technology, in particular to an audio data encoding method and device. Background technique [0002] Ogg / Vorbis is a general-purpose perceptual audio codec developed by the Xiph.org organization in the United States. Ogg is a multimedia outer layer format that can contain digital audio (Vorbis) or digital video (Tarkin). Vorbis is a dedicated audio format developed by Xiph.org. Compared with other encoding algorithms such as MP3, the biggest feature of Ogg / Vorbis is: the source code is completely open, there is no patent restriction, and it has greater encoding flexibility. Ogg / Vorbis adopts a lossy audio compression algorithm, which is equivalent to the current audio algorithms such as MPEG-2 and MPEG-4 at the high quality (high bit rate) level (CD or DAT stereo, 16 / 24bit quantization) ;Ogg / Vorbis encoder can compress CD or DAT high-quality stereo signal to a bit rate lower than 48Kbps without re-sampling to a low...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/02G10L19/032
CPCG10L21/00G10L19/032
Inventor 陈展
Owner ACTIONS ZHUHAI TECH CO
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