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Method for simplifying acoustic model analysis through applying audio frame frequency spectrum flatness and device thereof

一种声学模型、音频帧的技术，应用在语音分析、仪器等方向，能够解决影响系统效率、声学模型分析多余、运算量增加等问题

Inactive Publication Date: 2010-06-23
ALI CORP
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Problems solved by technology

Therefore, when the left and right channel signals are suitable for the same-difference signal transformation, it is redundant to first perform the acoustic model analysis of the left and right channel signals in step 300, resulting in an unnecessary increase in the amount of computation.
[0008] Therefore, in view of the fact that the above-mentioned process 20 and process 30 may cause an unnecessary increase in the amount of computation and affect system efficiency, it is indeed necessary to improve

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  • Method for simplifying acoustic model analysis through applying audio frame frequency spectrum flatness and device thereof
  • Method for simplifying acoustic model analysis through applying audio frame frequency spectrum flatness and device thereof
  • Method for simplifying acoustic model analysis through applying audio frame frequency spectrum flatness and device thereof

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[0034] The invention discloses a method for simplifying acoustic model analysis by applying the spectral flatness of audio frames. The main concept is to use the spectral flatness to determine the block type of an audio signal and whether it is the same or different signal type. (middle / side type, M / S type), thereby simplifying the execution of acoustic model analysis to increase the efficiency of compression.

[0035] Please refer to Figure 4 , Figure 4 It is a schematic diagram of a process 40 according to Embodiment 1 of the present invention. The process 40 applies audio frame spectral flatness to simplify acoustic model analysis, which includes the following steps:

[0036] Step 400: start.

[0037] Step 402: Calculate the frequency-domain energy of multiple audio frames included in an audio signal.

[0038] Step 404: Calculate multiple spectral flatnesses of the multiple audio frames according to the energy of the multiple audio frames in the frequency domain.

[00...

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Abstract

A method for simplifying acoustic model analysis through applying audio frame frequency spectrum flatness and a device thereof, which applies the audio frame frequency spectrum flatness to simplify the acoustic model analysis of a voice signal, if the voice signal contains a plurality of frames, firstly the energy of the voice signal in frequency domain is computed, computing a plurality of frequency spectrum flatness according to the computed energy, and then transforming each audio frame through evolutional discrete cosine transform of short block or long block. If the voice signal contains left and right channel signal, the invention firstly performs the acoustic model analysis of the voice signal, computes the energy of the left and right channel signal in frequency domain, computes the frequency spectrum flatness of the left and right channel signal, and then uses signal or left and right channel coding to transform the left and right channel signal.

Description

technical field [0001] The present invention relates to a method for simplifying acoustic model analysis, in particular to a method used in an audio compression system and utilizing audio frame spectrum flatness (spectral flatness) to simplify acoustic model analysis. Background technique [0002] With the rapid development of electronic audio and video products, the image compression technology applied to electronic audio and video products is becoming more and more important, among which, image compression using Motion Picture Experts Group (MPEG) is a mainstream. [0003] Please refer to figure 1 , figure 1 It is a schematic diagram of an operation flow 10 of an audio encoder (audioencoder) using a known motion image compression standard. First, an analog audio signal is transformed into a digital audio signal after pulse-code modulation (PCM) (step 100 ). This digital sound signal passes through sub-band filtering (subband filter) (step 102) to divide sound into sever...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L19/02
CPCG10L19/0212G10L25/00G10L19/00G10L19/008G10L19/025G10L19/03
Inventor 何宜伦
Owner ALI CORP
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