Direct coding of a class of non-stationary signals based on mixed transforms

Wasfy B. Mikhael, Andreas Spanias

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A mixed Fourier-Walsh signal representation is proposed for transform coding. Basis functions from two transforms are used, namely, the discrete Fourier transform (DFT) and the Walsh-Hadamard transform (WHT). An iterative algorithm is used to implement the mixed representation. A finite number of DFT components is used to represent the selective (narrowband) dominant spectrum of speech on a frame-by-frame basis. The whitened (broadband) residual signal is represented using a small number of Walsh components. The parameters of the mixed representation are coded directly by coding the dFT and WHT components. Results are given for frame-by-frame and packet coding at rates ranging from 16 kb/s to 9.6 kb/s.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE International Symposium on Circuits and Systems
Editors Anon
PublisherPubl by IEEE
Pages280-283
Number of pages4
Volume1
StatePublished - 1989
Externally publishedYes
EventIEEE International Symposium on Circuits and Systems 1989, the 22nd ISCAS. Part 1 - Portland, OR, USA
Duration: May 8 1989May 11 1989

Other

OtherIEEE International Symposium on Circuits and Systems 1989, the 22nd ISCAS. Part 1
CityPortland, OR, USA
Period5/8/895/11/89

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

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  • Cite this

    Mikhael, W. B., & Spanias, A. (1989). Direct coding of a class of non-stationary signals based on mixed transforms. In Anon (Ed.), Proceedings - IEEE International Symposium on Circuits and Systems (Vol. 1, pp. 280-283). Publ by IEEE.