Passive detection method and device for digital audio tampering based on power grid frequency phase time sequence representation
A power grid frequency, digital audio technology, applied in speech analysis, instruments, etc., can solve problems such as strong pertinence, too much experience component, insufficient recognition rate, etc., to achieve the effect of improving competitiveness, optimizing system structure, and improving recognition performance
Pending Publication Date: 2022-07-29
HUBEI UNIV OF TECH
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These methods often have the problems of too much experience or too much pertinence and insufficient recognition rate for a certain tampering method.
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[0055] The present invention is a passive detection method for digital audio tampering based on the characterization of power grid frequency and phase sequence. The algorithm flow chart of the present invention is as follows: figure 1 As shown, it can be divided into four parts: 1) ENF component acquisition; 2) ENF phase feature extraction; 3) ENF time series representation acquisition; 4) neural network training.
[0056] Step 1: Obtaining ENF components, the steps are as follows:
[0057] A. Downsample the audio, and set the resampling frequency to 1000HZ or 1200HZ;
[0058] B. Use a 10000-order linear zero-phase FIR filter for narrowband filtering, the center frequency is at the ENF standard (50HZ or 60HZ), the bandwidth is 0.6HZ, the passband ripple is 0.5dB, and the stopband attenuation is 100dB;
[0059] Step 2: ENF phase feature extraction, the steps are as follows:
[0060] A. Find the first-order derivative of the signal, add windowing by frame, discrete Fourier tra...
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The invention relates to a digital audio tampering passive detection method and device based on power grid frequency phase time sequence characterization, and the method comprises the steps: firstly processing to-be-detected audio data to obtain a power grid frequency (ENF) component, carrying out the processing of the ENF component based on DFT1 conversion to obtain an ENF phase, and calculating a frame number and a frame length according to a to-be-detected longest duration audio; framing processing is carried out on the ENF phase to obtain phase time sequence representation; and obtaining ENF time sequence information from the ENF phase time sequence representation by using a neural network, and performing classification after fitting. According to the method, the identification performance of the system can be effectively improved, the model generalization ability is improved, the system structure is optimized, and the competitiveness of corresponding equipment source identification products is improved.
Description
technical field [0001] The invention belongs to the technical field of digital audio tampering detection, and particularly relates to a method and device for passive detection of digital audio tampering based on the frequency and phase sequence characterization of power grids. Background technique [0002] Digital audio is one of the most accessible digital media in people's daily life. In addition to obtaining audio files by purchasing and downloading, audio / voice files can also be generated by real-time recording. However, the continuous development and improvement of audio editing and processing software has made it easier and cheaper to edit and modify audio. At the same time, it is difficult for the human ear to detect the traces left by this modification. Therefore, how to effectively verify the originality, integrity and authenticity of digital audio has become an urgent problem to be solved by digital audio passive forensics technology. [0003] Passive detection ...
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IPC IPC(8): G10L25/51G10L25/30G10L25/45
CPCG10L25/51G10L25/30G10L25/45
Inventor 曾春艳杨尧王志锋万相奎胡胜冯世雄孔帅余琰夏诗言崔浩
Owner HUBEI UNIV OF TECH