Real-time audio comparison method

An audio comparison and audio technology, applied in the field of real-time audio comparison, can solve problems such as large amount of calculation, achieve the effects of reducing calculation amount, saving computing resources, and improving accuracy

Active Publication Date: 2015-04-08
增长引擎(北京)信息技术有限公司
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Problems solved by technology

The disadvantage is that time-frequency transformation is involved, and the amount of calculation is large

Method used

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Embodiment Construction

[0038] The present invention will be described in further detail below.

[0039] The real-time audio comparison method of the present invention can compare and analyze two real-time audio signals to judge whether the two signals have the same content, including two steps of initial synchronization and periodic comparison.

[0040] The first step is the initial synchronization of the two audio channels.

[0041] The initial synchronization algorithm of the present invention adopts the original method of "finding the correlation of the eigenvalues ​​in the frequency domain", "two-way search", and "two-stage synchronization". The flow of the algorithm is as follows: figure 1 shown, including the following steps:

[0042] Step 101. Read N seconds of audio from the first audio signal and the second audio signal respectively, and sample the two audio segments to obtain two sets of audio sampling sequences to be synchronized. First assume that the delay value of the two audio signa...

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Abstract

The invention discloses a real-time audio comparison method for judging whether two signals are same contents. The real-time audio comparison method comprises the steps: initially synchronizing two audio signals, and periodically comparing two audios; respectively reading audios from the two audio signals for N seconds to sample two groups of audio sampling sequences to be synchronized; aligning two audio sampling sequences by moving a time delay value, wherein the moving of the time delay value at the time is coarse synchronization; backwards taking synchronous test audio sequences with the lengths of M from the same time point of the two audio sampling sequences so as to obtain feature value sequences of the two synchronous test audio sequences, wherein the time delay values are respectively D0, D1 and D2; respectively calculating relevance values L0, L1 and L2 of feature values of the two synchronous test audio sequences; regularly sampling audio signals of the two audios, and calculating an MEL cepstrum feature value and the relevance of two sampled audio sequences; if the relevance is still greater than a threshold A, indicating that contents of the two audios are still kept consistent within the period of time.

Description

technical field [0001] The invention relates to a comparison method for judging whether the contents of two real-time audio signals are the same. Background technique [0002] The two real-time audio signals are generally transmitted through different transmission channels, because the delay of channel transmission will cause the arrival time of the two signals to be out of sync. Therefore, the first thing to do for these two channels of real-time audio is to perform synchronization calculations to find out the delay of the two channels of signals. The result of synchronization will greatly affect the accuracy of subsequent comparisons. [0003] Therefore, in real-time audio comparison, the synchronization algorithm is the most critical module. [0004] In the prior art, there are many methods for judging whether two audio signals are synchronized: [0005] 1) Synchronization with auxiliary information, such as "audio watermark" technology, is to insert some additional au...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L25/51
Inventor 张丹胡志琳李佳骅石建
Owner 增长引擎(北京)信息技术有限公司
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