A deep analysis of discrete Fourier transform - rational dither modulation (DFT-RDM), developed to cope with linear time invariant filtering, is here presented. This study has been motivated by the significant increase of the error probability suffered by DFT-RDM for non-white hosts, in spite of the low bit-error rate achieved for white hosts under the same attack filter. The theoretical analysis of DFT-RDM has been generalized to non-white Gaussian hosts providing an explanation to the measured performance degradation. Afterwards an extension of DFT-RDM, named whitened DFT-RDM, is proposed to achieve the same bit-error rates for white and non-white Gaussian hosts. Experimental results are also presented that validate the developed analysis and illustrate the performance enhancement provided by the proposed extension of DFT-RDM, with both non-white Gaussian signals and real audio clips.
An extended analysis of discrete Fourier Transform –Rational Dither Modulation for non-white hosts / Scagliola, Michele; Fernando, Pérez González; Guccione, Pietro. - (2009), pp. 146-150. (Intervento presentato al convegno 2009 First IEEE International Workshop on Information Forensics and Security (WIFS) tenutosi a London, UK nel 6-9 December, 2009) [10.1109/WIFS.2009.5386466].
An extended analysis of discrete Fourier Transform –Rational Dither Modulation for non-white hosts
SCAGLIOLA, MICHELE;GUCCIONE, Pietro
2009-01-01
Abstract
A deep analysis of discrete Fourier transform - rational dither modulation (DFT-RDM), developed to cope with linear time invariant filtering, is here presented. This study has been motivated by the significant increase of the error probability suffered by DFT-RDM for non-white hosts, in spite of the low bit-error rate achieved for white hosts under the same attack filter. The theoretical analysis of DFT-RDM has been generalized to non-white Gaussian hosts providing an explanation to the measured performance degradation. Afterwards an extension of DFT-RDM, named whitened DFT-RDM, is proposed to achieve the same bit-error rates for white and non-white Gaussian hosts. Experimental results are also presented that validate the developed analysis and illustrate the performance enhancement provided by the proposed extension of DFT-RDM, with both non-white Gaussian signals and real audio clips.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
