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Measurement method for spacial sensed information content in acoustic field and application thereof

A measurement method and technology of information volume, applied in speech analysis, instruments, etc., can solve problems such as inability to solve spatial audio coding, inability to apply spatial perception information measurement, and inability to measure sound field spatial perception information

Inactive Publication Date: 2009-08-12
WUHAN UNIV
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Problems solved by technology

As for the spatial information obtained by using the spatial parameter extraction technology, the current measurement method is limited by its own measurement model, and it is no longer applicable to the measurement of the amount of spatial perception information, that is, the perceptual entropy calculated based on the monaural listening model Unable to measure the amount of spatial perception information in the sound field, unable to solve the most basic problems of spatial audio coding

Method used

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  • Measurement method for spacial sensed information content in acoustic field and application thereof
  • Measurement method for spacial sensed information content in acoustic field and application thereof
  • Measurement method for spacial sensed information content in acoustic field and application thereof

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Embodiment Construction

[0029] The process of measuring the amount of spatial perception information in the sound field is as follows: figure 1 shown, including the following steps:

[0030] (1) The preprocessing unit performs framing and time-frequency conversion processing on the input audio signal. Taking 1024 sampling points as the frame unit, FFT transform is used to realize the conversion from time domain signal to frequency domain signal.

[0031] The critical frequency band filtering process of the auditory system is simulated by the critical frequency band filtering unit to determine the division rules of the critical frequency band. The critical band filtering unit adopts Barker’s band division rule, which is composed of 25 sub-band filters, and the width of each frequency band is a critical bandwidth. The schematic diagram of Barker’s band division rule is as follows figure 2 shown.

[0032] The selection of the spatial parameter set is determined by the spatial parameter selection uni...

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Abstract

The invention discloses a method for measuring spatial perception information content in a sound field and application thereof. The method uses spatial perception entropy (SPE) to represent the size of spatial information content which can be perceived in multi-channel audio signals, namely, the size of the spatial perception information content received by human ears in expressing double-ear audition. The SPE using a double-ear audition model as the basis represents the size of the spatial information content which can be perceived in the multi-channel audio signals, is the lower limit of a spatial audio code rate, and solves the problem that the perception entropy calculated by using a single-ear audition model as the basis cannot measure the spatial perception information content in the sound field.

Description

technical field [0001] The invention relates to a measurement method and application of spatial perception information in a sound field, in particular to a measurement method and application of spatial perception information based on binaural listening in a spatial audio system. Background technique [0002] Since Shannon proposed the concept of entropy in 1948 and created information theory, entropy has been used as a measure of information. In 1988, Johnston proposed the concept of perceptual entropy (Perceptual Entropy, hereinafter referred to as PE) on the basis of Shannon entropy. Under the premise, how many bits are required to represent an audio sequence at least. The theoretical basis of perceptual entropy is psychoacoustics. The existing mainstream perceptual audio coders all use PE as an important psychoacoustic indicator, such as MP3 and AAC coders. [0003] In traditional perceptual audio coding, perceptual entropy is used to estimate the amount of perceivable ...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/02
Inventor 胡瑞敏陈水仙陈文琴张磊王恒曹晟陈冰陈琪
Owner WUHAN UNIV
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