Improvement and Implementation of Audio Watermarking by Using DCT

Audio watermarking is a technique to embed copyright or other information such as shorten URL into an audio data. The embedded is perceptually inaudible to maintain the quality of the original audio. The proposed method is to embed the watermark into the audio signal by using discrete cosine transform spread-spectrum modulation. It’s hard to decode the watermark accurately because of the distance from the speaker, and the position of microphone. The proposed method is to determine the watermark by the correlation in order to improve the accuracy of watermark. In this experiment, we will observe the results that influenced by the proposed method. After the MP3 compression, the results will show how the proposed method can improve the accuracy.