Audio spread-spectrum watermark processing method for protecting audio data

A technology of audio data and processing method, applied in the field of information hiding in multimedia information security, to achieve the effect of reducing the bit error rate

Inactive Publication Date: 2008-09-24
CHONGQING TELECOMMUNICATION INSTITUTE
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AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the traditional spread spectrum watermark processing method cannot effectively resist the DA/AD conversion attack, and to provide an audio frequency spread spectrum watermark processing method for protecting audio data. The audio frequency spread spectrum watermark processing that the noise itself affects the corr

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  • Audio spread-spectrum watermark processing method for protecting audio data
  • Audio spread-spectrum watermark processing method for protecting audio data
  • Audio spread-spectrum watermark processing method for protecting audio data

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Embodiment Construction

[0047] see Figure 1 to Figure 3 , which is a preferred embodiment of the audio frequency spread spectrum watermark processing method for protecting audio data in the present invention, including:

[0048] 1) Carry out watermark embedding to the original audio information at the multimedia source end, the specific process is as follows:

[0049] The watermark to be embedded is a random sequence of length L, which is represented by a vector as w, that is, w=(w 1 ,w 2 ,...,w L ), where w i ∈ {-1, 1}.

[0050] Firstly, the watermark information to be embedded is error-corrected encoded by a (7, 4) BCH code encoder to obtain the watermark information after error-corrected encoding; the obtained length is The watermark information b=(b 1 , b 2 ,...,b 7L / 4 ), where L may be set to be an integer multiple of 4, if L is not an integer multiple of 4, you can add ‘-1’ after w to make it an integer multiple of 4.

[0051] Select the PN sequence generator to obtain the PN sequenc...

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Abstract

The invention discloses an audio spread spectrum watermark processing method for protecting the audio data, comprising two processes: a watermark embedding process and a watermark extraction process; in the embedding process, a wavelet de-noising technique is used for separating the noise of the signal and noise intensity control factor is used for reducing the noise signal intensity, and the effect of the noise of the signal on the detector performance is reduced; in order to improve the performance of the detector, the wavelet de-noising technique is also used in the water extraction process; in order to overcome the problem of excessively large correlation sliding detection calculation quantity in the corresponding detection, a synchronous positioning mechanism is designed. The algorithm is applicable to music and speech, which can effectively resist the attack of normal signal processing, more particularly, the attack of DA/AD conversion, thus being applied to the fields such as audio copyright protection, temper-proofing, certification, etc.

Description

technical field [0001] The invention relates to the technical field of information hiding in multimedia information security, in particular to a method for processing a frequency spread watermark for protecting audio data. Background technique [0002] Cryptography technology based on computational complexity theory has always been the main way to ensure the safe transmission of secret information. It mainly relies on encryption algorithms and key lengths to ensure the security of encrypted information. However, due to the randomness and unreadability of the encrypted information, the existence of the ciphertext itself is exposed, and then the attacker deciphers the ciphertext or attacks the channel, resulting in the decipherment of the ciphertext or the transmission of secret information. Fail, cause loss. Since the 1990s, multimedia information hiding technology has become a major research hotspot in the field of information technology. This kind of information hiding is...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/018
Inventor 由守杰柏森刘郁林曹巍巍朱桂斌赵波
Owner CHONGQING TELECOMMUNICATION INSTITUTE
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