Speech Watermarking Using Logarithmic Approach
The rapidly growing field of digitized transmission of audio, video and image has been urged the need of security and integration of data. Watermarking is a technique providing data integrity and authentication. To obtain robustness, the process of watermarking is done in frequency domain. To transform the cover signal and speech signal into frequency domain Discrete Cosine Transform (DCT) and Exponential Transform are used respectively. Then the transformed speech signal is embedded into the cover signal and a complex signal is obtained. During the decoding process the original cover signal and speech signals are obtained by applying inverse DCT and Logarithm to the complex signal. The implementation of this paper is done in MATLAB.