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Bit distributing method in audio-frequency coding

An audio coding and audio encoder technology, applied in the field of perception-based audio coding, which can solve complex problems

Inactive Publication Date: 2006-03-01
VIMICRO CORP
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Problems solved by technology

In some applications, both computational complexity and coding quality are important considerations. At this time, the above-mentioned bit allocation scheme based on two-loop nested loops (two-loop) is too complicated, and ordinary optimization methods cannot Fundamentally solve the complexity of the allocation scheme structure itself

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  • Bit distributing method in audio-frequency coding
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Embodiment Construction

[0081] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0082] In order to clearly describe the present invention, it is first necessary to explain the basic idea of ​​the present invention.

[0083] Let the quantization step size

[0084] step _ size ( n ) = 2 3 16 scfGain ( n ) - - - ( 4 )

[0085] Considering the formulas (1), (2) and (3), due to the nature of the rounding operation, it can be known that the quantization noise energy P Q (n) is not a strictly monotonic function of the quantization step step_size(n). But as mentioned earlier, genera...

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Abstract

A method for distributing bit in audio coding includes using mask threshold to estimate initial value for effective dimension factor of all dimension factor band in a signal frame according to limit condition , regulating each effective dimension factor to use lower limit value as value of effective dimension factor, obtaining dimension factor for global dimension factor and each dimension factor band as per obtained value , regulating global dimension factor according to code rate limit condition till bit number required by entropy coding is less than usable bit number .

Description

technical field [0001] The invention relates to a perceptual-based audio coding technology, in particular to a bit allocation method in audio coding. technical background [0002] In the design of the audio system, a sound data compression coding method is to use the characteristics of the human auditory system and use the psychoacoustic model (psychoacoustic model) to achieve the purpose of compressing the sound data. This compression coding is called perceptual audio coding ( perceptual audio coding). A basic concept in the psychoacoustic model is that there is an auditory threshold in the auditory system, and sound signals below this threshold cannot be heard. Therefore, when the quantization error is less than the masking threshold condition, although it is lossy coding, it can achieve perceptual transparency. . The value of the masking threshold is related to the time-frequency characteristics of a specific audio signal. [0003] After entering the 1980s, especially ...

Claims

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Application Information

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IPC IPC(8): H03M7/30G10L19/00G10L19/002
Inventor 邓昊冯宇红
Owner VIMICRO CORP
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