DocumentCode
760583
Title
Design of a discrete cosine transform based speech scrambler
Author
Dawson, E.
Author_Institution
Sch. of Math., Queensland Univ., Technol., Brisbane, Qld., Australia
Volume
27
Issue
7
fYear
1991
fDate
3/28/1991 12:00:00 AM
Firstpage
613
Lastpage
614
Abstract
A discrete cosine transform based speech-encryption system suitable for communication over band-limited telephone channels, is described. An energy modification technique is presented which dramatically reduces the residual intelligibility of the scrambled speech. In addition, a method used to reduce the undesirable effects of band limitation is described. Simulation results are included which demonstrate the improved performance of the scheme.
Keywords
cryptography; speech analysis and processing; speech intelligibility; telephony; band limitation; band-limited telephone channels; discrete cosine transform; energy modification technique; residual intelligibility; speech scrambler; speech-encryption system;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19910385
Filename
100867
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