Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Digital audio record integrity detection method

A technology of integrity detection and digital recording, which is applied in speech analysis, instruments, etc., can solve the problems of long recording time and low accuracy rate to be detected

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
View PDF1 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to record a large amount of power grid frequency information from the power grid in advance; at the same time, it requires a long time for the recording to be detected, and the correct rate of this method is very low for short recordings to be detected
On the other hand, domestic research on the integrity detection of digital recordings is also in its infancy. At present, there is only a detection method for the specific compressed format MP3, and there is no integrity detection method for digital recordings in the uncompressed WAV format and other formats. publications

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 more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Digital audio record integrity detection method
  • Digital audio record integrity detection method
  • Digital audio record integrity detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In the process of digital recording integrity detection in the present invention, the frequency and phase characteristics of the power grid are used to realize tampering judgment and tampering position location. The grid frequency phase feature is to detect the continuity feature of the phase by extracting the grid frequency in the digital recording and calculating the corresponding grid frequency phase.

[0022] Digital recording integrity detection method of the present invention such as figure 1 As shown, the grid frequency is 50Hz, including the following steps:

[0023] Step 11, perform down-sampling on the digital recording carrying the grid frequency to be detected. The sampling point sequence a(n) of the digital recording to be detected is down-sampled, and the new sampling frequency is f s =1000Hz, the audio sequence a'(n) after sampling is obtained;

[0024] Step 12, pass the sampled audio through a digital bandpass filter. Pass a'(n) through a digital nar...

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

No PUM Login to View More

Abstract

The invention discloses a digital audio record integrity detection method, which comprises the following steps of: 1, performing down-sampling on a digital audio record which is to be detected and carries power grid frequency; 2, performing band-pass filtering on sampled data; 3, performing framing processing on a filtered audio sequence, extracting the power grid frequency frame by frame, and calculating corresponding power grid frequency phases to obtain a power grid frequency phase sequence; and 4, detecting the integrity of the digital audio record according to characteristic values of the power grid frequency phases. The phase characteristics of the digital audio record with the power grid frequency, whether the digital audio record is subjected to tampering such as insertion, deletion and replacement or not is judged, and a tampering position is determined to detect the integrity of the digital audio record. The method can be used for the integrity authentication of a digital audio record evidence in court evidencing.

Description

technical field [0001] The invention relates to the field of audio detection, in particular to a digital recording integrity detection method. Background technique [0002] With the popularization of digital recording and editing functions, digital recordings are increasingly used as evidence in judicial cases. Therefore, it is of great significance to detect whether the digital recording has undergone tampering operations such as insertion, deletion, and replacement, and to determine the integrity of the digital recording. [0003] Integrity testing of digital recordings began in Europe. Grigoras published the article "Digital Audio Recording Analysis: The Electric Network Frequency (ENF) Criterion" (Digital Audio Recording Analysis: The Electric Network Frequency (ENF) Criterion) in 2005, pointing out that the digital recording equipment not only captures the voice signal during recording, but may also record the The grid frequency at that time; by extracting the grid fr...

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
no application Login to View More
IPC IPC(8): G10L11/00G10L19/00G10L25/51
Inventor 沈一峰贾珈蔡莲红
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com