Speech encryption using discrete orthogonal transforms

Author

Sridharan, S. ; Dawson, E. ; Goldburg, B.M.

Author_Institution

Sch. of Electr. & Electron. Syst. Eng., Queensland Univ. of Technol., Brisbane, Qld., Australia

fYear

1990

fDate

3-6 Apr 1990

Firstpage

1647

Abstract

The performances of five discrete orthogonal transforms in speech encryption systems are compared. The transforms considered are the discrete Fourier transform, discrete cosine transform, Walsh-Hadamard transform, Karhunen-Loeve transform, and discrete prolate spheroidal transform. Four objective measures are used to grade the encryption systems with respect to residual intelligibility and recovered voice quality. A figure of merit based on all the four objective measures is formed. It gives good correlation to the subjective results of residual intelligibility and recovered speech quality

Keywords

cryptography; speech intelligibility; speech recognition; transforms; Karhunen-Loeve transform; Walsh-Hadamard transform; discrete Fourier transform; discrete cosine transform; discrete orthogonal transforms; discrete prolate spheroidal transform; recovered voice quality; residual intelligibility; speech encryption systems; Cryptography; Discrete Fourier transforms; Discrete cosine transforms; Discrete transforms; Fast Fourier transforms; Fourier transforms; Karhunen-Loeve transforms; Narrowband; Speech; Speech processing; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on

Conference_Location

Albuquerque, NM

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1990.115791

Filename

115791