Robustness Performance Analysis of Audio Watermarking Algorithm Based on Direct Sequence Spread Spectrum

摘要

To analyze the robustness performance of direct sequence spread spectrum (DSSS) based audio watermarking algorithm theoretically, the fundamental principle of spread spectrum watermarking is analyzed firstly. The communication model of DSSS-based audio watermarking system is designed according to the spread spectrum communication theory. The interrelation between bit error rate (BER) and watermark power and processing gain is revealed by utilizing definition of the optimal baseband transmission system under ideal channel. Finally, Monte Carlo simulation method is used to prove the BER formula. Experiments reveal that the expression can calculate the BER of detected watermarking under cover audio and additive white Gaussian noise (AWGN) interferences accurately.