Introduction to Audio Watermarking Project:
Audio water marking technical white paper is a presentation in engineering seminar showing the needs of audio water marking in this present day situation.
Digital data is of audio or video and it is represented by 0 or 1 of binary bits.
The data can be stored for long period without damage. Because of public exposure, the property of data can be loss by the number of ways such as mp3 compression, low pass filtering and amplitude scaling.
Audio watermarking is a new technique which protects the audio data, the data will not be lost.
The features of audio water marking are transparent, robust, efficient and independent. They are of two types.
One is temporal water marking and the other is special water marking. In temporal water marking, the water marks are hidden directly into the digital audio signals in the time domain.
Where as in special water marking, it applies the transfer of frequency such as FFT, SCT and DW and the water marked information is veiled under the transformed data.
Audio watermarking can be applied by DC level shifting in which watermark is embedded by shifting the DC level of the audio signal. And this DC level of audio signal does not need the original signal and the water mark and there is no robustness to filtering as water mark is embedded to all frequency bands.
Brand division scheme (BDS) and Spread Spectrum scheme (SSS) can provide protection against the mp3 compression. It is conclude in the seminar that water mark can be embed in an audio signal without detection and being perceived as required. It is extracted without the original signal. The water mark is known as blind otherwise public audio water marking.
Download Project Report on Audio Watermarking .