MATLAB Program for Implementing Digital Watermarking in Audio Files

I have developed a MATLAB program for embedding digital watermarks into audio files. This implementation utilizes sophisticated embedding algorithms such as spread spectrum or quantization index modulation to insert copyright protection and authentication information directly into the audio signal. The program features dual functionality with both encoding and decoding modules - the encoder transforms watermark data into imperceptible modifications in the frequency or time domain, while the decoder employs correlation detection or statistical analysis to accurately extract the embedded information. Key MATLAB functions include wavread/wavwrite for audio I/O, fft/ifft for frequency domain processing, and custom embedding functions that manipulate discrete cosine transform (DCT) coefficients or wavelet coefficients. The program offers a user-friendly GUI interface where users can select watermark patterns (binary sequences or images), adjust embedding strength parameters, and choose between different transform domains. Performance testing demonstrates exceptional efficiency with fast embedding/extraction speeds achieved through optimized matrix operations and minimal impact on audio quality (maintaining high PSNR values). This robust MATLAB toolkit provides comprehensive digital rights management capabilities while maintaining ease of use for audio copyright protection applications.