Method and device for embedding watermark into audio frequency and decoding watermark from audio frequency

Abstract

The invention relates to a method and a device for embedding a watermark into audio frequency and decoding the watermark from the audio frequency. The irrelevance between different spreading codes is fully utilized, and a watermark frame is randomly embedded by the spreading codes, so the mutual interference between the watermark components of each mixed audio frequency is reduced, and the accuracy rate of the watermark decoding is greatly improved. Meanwhile, by considering that the calculation amount is abruptly increased by using all spreading codes to carry out correlation detection, a novel frame structure is put forward, so the calculation amount is greatly reduced. A multi-synthetic technique is also put forward, so the watermark components are decoded in a synchronous way, the problem of the prior synthesizing technique that only one mixed audio component is synthesized is solved, and a digital audio frequency watermark algorithm capable of defending the mixed audio attack is realized.

Description

technical field [0001] The present invention relates to information hiding technology, in particular to a method and device for embedding and deciphering watermark in digital audio based on random spreading code. Background technique [0002] With the rapid development of computer network technology and multimedia technology, it is more convenient for people to obtain digital multimedia files. However, what follows is a large number of unauthorized copies and downloads and other illegal acquisition and use of digital multimedia files. Digital watermarking is an information hiding technology that emerges at the historic moment and can be used for ownership authentication and tracking of unauthorized behavior. In the application of the digital audio field, the digital watermark must ensure that the watermark information is still complete and accurate after a series of audio processing, which is the most important property of watermark security. Therefore, technologies for en...

AI Technical Summary

Problems solved by technology

[0004] The mixing attack of audio watermark refers to mixing multiple audio files containing audio watermark, so that the watermark cannot be solved or a large number of wrong codes can be solved

After mixing the watermarked audio, the watermark codes of each audio will interfere with each other, resulting in a great interference in the correlation score of the spreading code during decoding, resulting in a large number of error codes

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