ITRW on Non-Linear Speech Processing (NOLISP 07) Paris, France May 22-25, 2007

The Hartley Phase Cepstrum as a Tool for Signal Analysis

I. Paraskevas (1), E. Chilton (1), M. Rangoussi (2)

(1) Centre for Vision Speech and Signal Processing (CVSSP), School of Electronics and Physical Sciences, University of Surrey, Guildford, Surrey, UK
(/2) Department of Electronics, Technological Education Institute of Piraeus, Aigaleo-Athens, Greece

This paper proposes the use of the Hartley Phase Cepstrum as a tool for signal analysis. The phase of a signal conveys critical information, which is exploited in a variety of applications. The role of phase is particularly important for the case of speech or audio signals. Accurate phase information extraction is a prerequisite for speech applications such as coding, synchronization, synthesis or recognition. However, signal phase extraction is not a straightforward procedure, mainly due to the discontinuities appearing in it (‘wrapping’ effect). A variety of phase ‘unwrapping’ algorithms have been proposed to overcome this point, when the extraction of the accurate phase values is required. In order to extract the phase content of a signal for subsequent utilization, it is necessary to choose a function that can encapsulate it. In this paper we propose the use of the Hartley Phase Cepstrum (HPC).

Full Paper

Bibliographic reference.  Paraskevas, I. / Chilton, E. / Rangoussi, M. (2007): "The Hartley phase cepstrum as a tool for signal analysis", In NOLISP-2007, 80-83.