Audio Watermarking Algorithm Based on WSOLA Resisting Speed Change

Digital audio watermarking algorithm is a technology that embeds the watermark signal with special significance into the original audio signal through some method, and then extracts the watermark signal when necessary. It has important applications in the fields of copyright protection, content authentication, secure communication and bill anti-counterfeiting. With the popularity of various multimedia software and audio editing software, it becomes more and more convenient to modify audio. Common audio editing operations such as editing, shifting, tone sandhi and splicing are widely used, but most of the existing digital audio watermarking algorithms can not resist shifting operations. Therefore, this paper proposes an audio watermarking algorithm for audio variable speed attack. The algorithm is based on WSOLA principle. In the process of audio speed change, the spread spectrum watermark is embedded into the non overlapping region.