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A method for identifying multiple compressions of digital audio aac format

A digital audio, multiple compression technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of not finding

Active Publication Date: 2018-08-14
深圳国信安信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Analyze whether the AAC format audio file has been compressed multiple times, so far no literature has been found for such work

Method used

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  • A method for identifying multiple compressions of digital audio aac format
  • A method for identifying multiple compressions of digital audio aac format
  • A method for identifying multiple compressions of digital audio aac format

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Embodiment Construction

[0026] The method of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] The present invention proposes a method for identifying multiple compressions of the digital audio AAC format. The process of identifying whether the audio to be tested has been compressed multiple times is very simple, such as figure 1 shown. For the input audio to be tested in AAC format, firstly, it is decoded to obtain the first group of small Huffman values. Then, the decoded file is compressed again, and then decoded to obtain the second set of Huffman small values. Finally, the Huffman small value obtained twice is made into the feature value of the audio to be tested, and the SVM classifier is used for classification and identification. Specific steps are as follows:

[0028] 1) Construction of digital audio set:

[0029] 11) The construction of a compressed audio set: first select lossless WAV format files, including Chinese songs, for...

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Abstract

The invention discloses a method for identifying a plurality of times of compression of an ACC format of a digital audio, which is a counting and identifying method according to characteristics of audio compression and belongs to the field of processing of multimedia signals. According to the method, an MDCT (Modified Discrete Cosine Transform) coefficient is changed when the digital audio is compressed so that Huffman codes are different. Along the increasing of the number of times of compressing, the difference is smaller and smaller. With the adoption of the method, characteristic values are formed by differences between small values of the Huffman codes in the different numbers of times of compressing and are classified by an SVM classifier, and whether the digital audio with the ACC format is compressed for the plurality of times or not can be identified very well. The method can be used as an effective means for identifying whether files with the ACC format are compressed for the plurality of times or not, and can be widely applied to the aspects of identifying the digital audio and filtering music with fake tone quality.

Description

technical field [0001] The invention relates to the field of multimedia signal processing, in particular to an analysis method for identifying whether the digital audio AAC format has been compressed multiple times. Background technique [0002] The continuous advancement of science and technology has brought great convenience to people's life, and all kinds of multimedia have become an indispensable part of people's daily life. With the maturity of multimedia technology, people are increasingly pursuing high-quality multimedia. The purpose of the AAC standard is to replace the currently popular MP3 format, and its higher audio quality and smaller storage space have become people's favor. At present, mobile storage devices and portable players occupying a mainstream position in the market all begin to support digital audio in the AAC format. However, with the emergence of various powerful audio editing software on the Internet, such as ffmpeg, audition, etc., people can ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/30
CPCG06F16/1744
Inventor 杨锐王刚刘红梅
Owner 深圳国信安信息技术有限公司