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Detection method for sudden change of digital audio waveform

A technology of digital audio and detection methods, applied in speech analysis, instruments, etc., can solve the problems of digital audio tampering, destruction of integrity, authenticity, and original destruction of information data, and achieve the effect of good detection and positioning functions.

Active Publication Date: 2017-02-22
广西平果润民发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Digital audio is easy to transmit and disseminate through physical or electronic systems, but at the same time these advantages also bring many new problems: digital audio may suffer from intentional or unintentional tampering during recording and copying
Whether it is intentional tampering that destroys integrity and authenticity, or errors that may occur during transmission and dissemination, it will damage the originality of its own information data, especially in some information with special significance, such as court evidence, department Confidential documents, backups of historical documents and other important content, once maliciously tampered with, will cause very serious consequences

Method used

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  • Detection method for sudden change of digital audio waveform
  • Detection method for sudden change of digital audio waveform
  • Detection method for sudden change of digital audio waveform

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Embodiment 1

[0023] Embodiment 1 of the present invention: the detection method of digital audio waveform mutation,

[0024] 1) Convert the audio signal to y Transform to get the audio spectrum in the logarithmic domain Y : For a digital audio signal of length h y , for the audio signal y Carry out frame division, the length of each frame is 2 * N (set N=128); the overlap rate is l (set up l = 0.5), then the number of frames N 1 for:

[0025]

[0026] Let the framing signal be y i , i=1...N l , using formula (1) to perform discrete short-time Fourier transform, we get Y ti , where w(N-m) is the window function (set to the Hamming window function).

[0027]

[0028] Use the formula (2) to calculate the spectrogram, and perform logarithmic transformation to obtain the logarithmic spectrum G i (i=1...N l ,) ,which is

[0029]

[0030] Combining all logarithmic amplitude values ​​into a matrix is ​​the logarithmic spectrum of the speech signal G , whose size ...

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Abstract

The invention discloses a detecting method based on digital audio waveform sudden changes, which is a statistical judging method disclosed according to the characteristic of a ridge of a speech spectrum caused by audio waveform sudden changes, and belongs to the multimedia information safety field. For waveform sudden change detection due to copying-pasting operation of a digital audio, ridge span changes before and after audio joint points in a speech spectrum log domain are analyzed, and a ridge factor is constructed to describe ridge bandwidth of a one-frame audio log speech spectrum to represent short-time energy change characteristics, and a difference operator is utilized for distinguishing sudden noises of audio, and ridge factor identification is caused by audio waveform sudden changes. The method comprises the following steps of carrying out short-time Fourier transformation and logarithmic transformation on an audio signal to obtain an audio spectrum of the log domain; calculating the ridge factor of each frame in the speech spectrum; and detecting and judging the difference transformation result for the ridge factor. The detecting method disclosed by the invention can identify audio waveform sudden changes effectively, and provides an effective method for detecting a digital audio editing operation boundary.

Description

technical field [0001] The invention relates to the field of multimedia information security, in particular to a method for detecting sudden changes in digital audio waveforms. Background technique [0002] The digitalization of multimedia technology and the progress of transmission technology make the application of digital audio grow rapidly. Digital audio is easy to transmit and disseminate through physical or electronic systems, but at the same time these advantages also bring many new problems: digital audio may suffer from intentional or unintentional tampering in the process of recording and copying. Whether it is intentional tampering that destroys integrity and authenticity, or errors that may occur during transmission and dissemination, it will damage the originality of its own information data, especially in some information with special significance, such as court evidence, department Once important content such as confidential documents and historical document ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/00G10L25/60
Inventor 徐晶
Owner 广西平果润民发展有限公司
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