A hybrid pre-whitening technique for detection of additive spread spectrum watermarks in audio signals

Kumar, Krishna S and Sreenivas, Thippur (2006) A hybrid pre-whitening technique for detection of additive spread spectrum watermarks in audio signals. In: 14th European Signal Processing Conference (EUSIPCO 2006), September 4-8, 2006, Florence, Italy.

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Abstract

Pre-whitening techniques are employed in blind correlation detection of additive spread spectrum watermarks in audio signals to reduce the host signal interference. A direct deterministic whitening (DDW) scheme is derived in this paper from the frequency domain analysis of the time domain correlation process. Our experimental studies reveal that, the Savitzky-Golay Whitening (SGW), which is otherwise inferior to DDW technique, performs better when the audio signal is predominantly lowpass. The novelty of this paper lies in exploiting the complementary nature to the two whitening techniques to obtain a hybrid whitening (HbW) scheme. In the hybrid scheme the DDW and SGW techniques are selectively applied, based on short time spectral characteristics of the audio signal. The hybrid scheme extends the reliability of watermark detection to a wider range of audio signals.

Item Type:	Conference Paper
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	11 Nov 2011 06:12
Last Modified:	11 Nov 2011 06:12
URI:	http://eprints.iisc.ac.in/id/eprint/42031

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