Proceedings ArticleDOI
Speech encryption using discrete orthogonal transforms
Sridha Sridharan,Ed Dawson,B. Goldburg +2 more
- pp 1647-1650
TLDR
The performances of five discrete orthogonal transforms in speech encryption systems are compared and a figure of merit based on all the four objective measures is formed that gives good correlation to the subjective results of residual intelligibility and recovered speech quality.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. >read more
Citations
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Journal ArticleDOI
Proposed Random Unified Chaotic Map as PRBG for Voice Encryption in Wireless Communication
TL;DR: A proposed random Unified chaotic map as PRBG and its application in digital voice encryption and the simulation of the proposed scheme has been implemented using MATLAB (R2013a) programming language.
Journal ArticleDOI
Hierarchical Selective Encryption for G.729 Speech Based on Bit Sensitivity
TL;DR: A group of hierarchical selective encryption schemes based on the computational complexity analysis of G.729 standard speech are presented and the effectiveness of these schemes for power-constrained devices and narrow bandwidth environments is demonstrated.
Book ChapterDOI
Chaos-Based Cryptography for Voice Secure Wireless Communication
TL;DR: This chapter summarizes the traditional and modern techniques of voice/speech encryption and demonstrates the feasibility of adopting chaos-based cryptography in wireless communications.
Proceedings ArticleDOI
Chaos based cryptography for voice encryption in wireless communication
TL;DR: The traditional and modern techniques of voice/speech encryption are summarized and the feasibility of adopting chaos based cryptography for in wireless communications is demonstrated.
Proceedings ArticleDOI
Optimization of fast Fourier transforms on the Blue Gene/L supercomputer
TL;DR: The fundamental limits to scaling of the parallel transposealgorithm for computing FFT are discussed, and results for strong scaling and weak scaling of parallel FFT on Blue Gene/L are presented.
References
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Journal ArticleDOI
Objective quality evaluation for low-bit-rate speech coding systems
TL;DR: An LPC (linear predictive coding) cepstrum distance measure (CD) is introduced as an objective measure for estimating the subjective quality of speech signals and good correspondence between LPC CD and the subjectivequality, expressed in terms of both opinion equivalent Q and mean opinion score are shown.
Journal ArticleDOI
An analog scrambling scheme which does not expand bandwidth, Part I: Discrete time
TL;DR: A large family of linear orthogonal invertible scrambling transformations is described that result in a negligible expansion of bandwidth and can therefore serve as building blocks in a secure communication system.
Journal ArticleDOI
An analog speech scrambling system using the FFT technique with high-level security
A. Matsunaga,K. Koga,M. Ohkawa +2 more
TL;DR: A full-duplex analog speech-scrambling system is proposed for application to mobile communication systems and public switched telephone networks and the simulation results indicate that the scrambled speech has no residual intelligibility and the descrambled speech quality is satisfactory.
Journal ArticleDOI
An analog scrambling scheme which does not expand bandwidth, Part II: Continuous time
TL;DR: The techniques developed in Part I[1] for discrete-time analog scrambling are applied to the problem of scrambling band-limited continuous-time signals or waveforms to produce a nearly band- limited scrambled sequence.
Journal ArticleDOI
A Speech Scrambler Using the Fast Fourier Transform Technique
K. Sakurai,K. Koga,T. Muratani +2 more
TL;DR: This paper describes an analog speech scrambler using the FFT technique (FFT scrambler), which provides highly secured scrambled signal by permuting a large number of FFT coefficients.