Reduced bit-rate representation of speech using mixed Fourier-Walsh transforms

Wasfy B. Mikhael, Andreas Spanias

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

3 Scopus citations


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 to 9.6 kb/s.

Original languageEnglish (US)
Title of host publicationConference Record - Asilomar Conference on Circuits, Systems & Computers
EditorsRay R. Chen
PublisherPubl by Maple Press, Inc
Number of pages5
StatePublished - 1988
Externally publishedYes
Eventv 1 (of 2) - Pacific Grove, CA, USA
Duration: Oct 31 1988Nov 2 1988


Otherv 1 (of 2)
CityPacific Grove, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


Dive into the research topics of 'Reduced bit-rate representation of speech using mixed Fourier-Walsh transforms'. Together they form a unique fingerprint.

Cite this