Audio watermark embedding and extracting method and device

Abstract

The invention provides an audio watermark embedding and extracting method and device. The embedding method includes the steps of obtaining an audio signal, uniformly segmenting the audio signal, obtaining a pseudo noise sequence, determining an echo kernel corresponding to the pseudo noise sequence, embedding a watermark bit in audio signal segments through the echo kernel and an echo hiding model, obtaining watermark audio signals corresponding to the audio signal segments, combining the watermark audio signals corresponding to the audio signal segments, and obtaining a watermark audio signal corresponding to the audio signal. Compared with an existing sequence p(n), the pseudo noise sequence q(n) has little energy in a human ear sensitive area, so that imperceptibility of watermark information is greatly improved. Besides, according to characteristics of the pseudo noise sequence q(n) used in the watermark embedding method, the invention further provides a novel decoding function which is used for extracting watermarks from the watermark audio signal, and the audio watermark extracting method based on the decoding function is high in robustness.

Description

technical field [0001] The invention belongs to the technical field of computer security, in particular to an audio watermark embedding and extraction method and device. Background technique [0002] With the rapid development of the information age, people can easily disseminate, copy and operate various digital media files through the network. Therefore, the protection of intellectual property rights for various digital media files is becoming more and more important. Digital watermarking is one of the effective ways to solve this problem. Digital watermarking is to embed some watermark marks into media files, and file owners can easily extract these information to protect their copyrights. [0003] Sound signals are usually one-dimensional data, and it is difficult to embed additional information without degrading the sound quality. At the same time, the human hearing system is also very sensitive and can recognize subtle differences in sound. Therefore, digital watermar...

AI Technical Summary

Problems solved by technology

[0013] In view of this, the present invention provides an audio watermark embedding and extraction method and device to solve the problem that in the existing digital watermark scheme based on echo concealment technology, p(n) has Large energy fluctuations lead to poor imperceptibility of the watermark, and the technical solution is as follows:

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