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
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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, dom

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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...

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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

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Application Information

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IPC IPC(8): G10L11/00G10L19/00G10L25/51
Inventor 沈一峰贾珈蔡莲红
Owner TSINGHUA UNIV
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