Title :
Design of a discrete cosine transform based speech scrambler
Author_Institution :
Sch. of Math., Queensland Univ., Technol., Brisbane, Qld., Australia
fDate :
3/28/1991 12:00:00 AM
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;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19910385
