Method and device for embedding watermark in audio signal

Abstract

The invention discloses a method and a device for embedding a watermark in an audio signal. The method comprises the steps of: judging whether a current left channel audio frame and a current right channel audio frame are both steady-state audio frames; if so, comparing frequency spectrum data of a scaling factor band on a position in a harmony channel audio frame with frequency spectrum data of a scaling factor band on the position in a balance channel audio frame, wherein the harmony channel audio frame and the balance channel audio frame are generated by carrying out middle side stereophonic treatment on the left channel audio frame and the right channel audio frame; and if a comparison result meets a preset requirement, embedding the watermark into the scaling factor band of the position in the balance channel audio frame.

Description

technical field [0001] The present invention relates to the field of signal processing, in particular to a method and device for embedding watermarks in audio signals. Background technique [0002] With the increase in the number of digital media, tens of thousands of Internet users can easily obtain various audio products. The development of Internet technology has also brought revolutionary changes to information transformation. However, piracy and copyright disputes have become an increasingly serious social problem. In order to prevent digital media information from being infringed and illegally tampered with, the copyright protection of digital media content is becoming more and more important. As an effective method of digital product copyright protection, digital watermarking technology has been extensively researched and applied. The so-called digital watermark is an identifiable digital signal or pattern that is permanently embedded in other data, and does not af...

AI Technical Summary

Problems solved by technology

Since the human auditory system is more sensitive to sound changes than the human visual system is to image changes, it is relatively difficult to embed watermarks in audio signals

[0003] There are many methods of embedding watermarks in audio signals, the simplest of which is the least significant bit algorithm (Least Significant Bit, LSB), this watermark embedding algorithm can embed a large amount of watermark information, but its watermark robustness is very poor , a little noise can destroy the watermark information

In addition, some watermark embedding algorithms hide the digital watermark under the masking threshold according to the masking effect of the human ear, but they cannot resist the common perceptual audio compression algorithm because the perceptual audio compression algorithm discards the data under the masking threshold of the human ear, thus The digital watermark is also lost; there are also some watermark embedding algorithms that embed the watermark by changing the quantized value after quantization. This method also has a large amount of embedding of the watermark, but it also has poor robustness.

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