Audio watermark adding and detecting methods and devices

Abstract

Embodiments of the invention disclose audio watermark adding method applied to a watermark adding end. The watermark adding end receives an input audio signal, and the audio signal is segmented into a plurality of sub signals according to a preset segment rule; through adoption of a preset conversion method, conversion is performed on each sub signal to obtain a corresponding sub signal after the conversion; aiming at each sub signal after the conversion, an energy difference corresponding to each sub signal is determined according to the size of each data point of the corresponding sub signal, wherein each energy difference is determined according to the maximum data point and the minimum data point of the corresponding sub signal; and watermark data is embedded into the sub signals having energy differences greater than a set threshold. The audio signal is segmented into the sub signals according to the embodiments, and the watermark data is added to the sub signals meeting an energy condition, so the object that watermarks are added to a plurality of positions of an audio file is achieved.

Description

technical field [0001] The invention relates to the field of data anti-counterfeiting, in particular to an audio watermark adding and detecting method and device. Background technique [0002] Audio watermarking technology is a branch of digital watermarking technology, which is the process of embedding information with specific meaning and easy to extract into it without affecting the volume of the original audio file. The transform domain algorithm in the audio watermarking algorithm is a commonly used method. The method of transform domain is to embed a specific watermark into the transform domain of the audio carrier, such as discrete Fourier transform (DFT), discrete cosine transform (DCT), wavelet transform, etc. Their common disadvantage is that the watermark is only embedded in one position in the transform domain of the audio file. Even if the third-party program software removes the part of the watermark, it will only affect the information in this position of the...

AI Technical Summary

Problems solved by technology

Their common disadvantage is that the watermark is only embedded in one position in the transform domain of the audio file. Even if the third-party program software removes the part of the watermark, it will only affect the information in this position of the transform domain, but the The overall sound quality of the audio file is not greatly damaged, which will reduce the cost of stealing and removing the audio watermark, that is, the third-party program software can remove the watermark in the audio file without much damage to the audio sound quality

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