A method and device for embedding and deciphering watermark in audio
A technology of embedding watermark and audio, which is applied in the field of information hiding, can solve problems such as error codes, spread spectrum code-related score interference, and watermarks that cannot be decoded by error codes, so as to improve the accuracy rate, reduce the amount of calculation, and resist mixing attacks.
Active Publication Date: 2016-02-17
INST OF ACOUSTICS CHINESE ACAD OF SCI +2
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[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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[0016] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0017] The invention makes full use of the irrelevance between different spread spectrum codes, adopts a method of randomly using spread spectrum codes to minimize mutual interference of mixed watermark components, and greatly improves the correct rate of watermark decoding. At the same time, considering that the increase in the number of spreading codes used for correlation detection will increase the amount of calculation, a new watermark frame structure is also proposed to greatly reduce the amount of calculation. In addition, a multi-synchronization technology is proposed, which allows each mixed watermark component to be synchronized at the same time during decoding, which solves the problem that the previous synchronization technology can only synchronize one mixed watermark component. Thus, a digital audio water...
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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...
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IPC IPC(8): G10L19/018
Inventor 颜永红郭宇弘赵学敏刘建
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI