Audio file generation time traceable dynamic matching method and system
A technology for dynamic matching and audio files, applied in speech analysis, spectrum analysis, instruments, etc., can solve the problems of obtaining time stamp information of audio files to be tested, achieve accurate audio time stamp recognition, reduce the impact of frequency resolution, The effect of improving the accuracy of acquisition
Active Publication Date: 2021-08-10
武汉大晟极科技有限公司
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The technical problem solved by the present invention is to provide a dynamic matching method and system for audio file production time traceability, which solves the problem of obtaining the time stamp information of the audio file to be tested
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0049] The present invention will be further described below in conjunction with accompanying drawing:
[0050]The purpose of the present invention is to generate time traceable dynamic matching of audio files, and obtain time stamp information of the audio files to be tested by increasing local window length and dynamic threshold matching based on power grid frequency signals. By accurately comparing the changes in the instantaneous value of the weak power grid frequency in the audio recording with the reference signal database, it can identify the creation time of the recording file, and even help detect whether the existing audio has been artificially tampered with, edited or destroyed.
[0051] The present invention provides a dynamic matching method for audio file production time traceability, such as figure 1 shown, including the following steps:
[0052] S1, using a narrowband bandpass filter to extract the power grid frequency time domain signal in the audio to be tes...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a dynamic matching method and system for audio file production time traceability. The method includes the following steps: using a narrowband bandpass filter to extract the power grid frequency time domain signal in the audio to be tested; using short-time Fourier transform to add poles The value method converts the power grid frequency signal in the time domain into the power grid frequency signal in the time-frequency domain; at the same time, it identifies the area with a small signal-to-noise ratio in the audio to be tested, and uses the short-time Fourier transform with a locally enlarged window length The method performs noise reduction processing; obtains the power grid frequency reference signal in the time-frequency domain; adopts a dynamic matching algorithm with the compressed Fourier transform frequency resolution as the threshold, and combines the power grid frequency signal in the time-frequency domain with the power grid frequency reference signal in the time-frequency domain Matching is performed, and the best matching position corresponds to the time stamp information of the audio to be tested. The invention can successfully obtain the time stamp information of the audio file to be tested, judge the authenticity of the digital multimedia file, and ensure information security.
Description
technical field [0001] The invention belongs to the technical field of multimedia digital forensics, and in particular relates to a dynamic matching method and system for audio file production time traceability. Background technique [0002] With the rapid development of information technology, the way people record and transmit information is no longer limited to text. Multimedia files stored in digital form have become an important part of information exchange due to their advantages of fast transmission and convenient storage. At the same time, digital multimedia content is also vulnerable to tampering and attacks in the process of online dissemination, so as to transmit false and wrong information, affect people's daily life, and even threaten social stability and unity. Therefore, how to judge the authenticity of digital multimedia files and ensure information security is particularly important. Multimedia digital forensics aims to analyze issues such as the generation...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G10L25/03G10L25/51G01R23/167
CPCG01R23/167G10L25/03G10L25/51
Inventor 华光王清懿张海剑
Owner 武汉大晟极科技有限公司