Title :
Speech scrambling with Hadamard transform in frequency domain
Author :
Wu, Yuan ; Ng, Boon Poh
Author_Institution :
Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
A speech scrambling algorithm is proposed in this paper based on Hadamard transform in frequency domain. It has a larger key space than the permutation algorithms. Simulations of this algorithm used in telephone communication were carried out. The results showed that this algorithm has low residual intelligibility and the recovered speech quality is fairly good. Fast algorithm is provided to reduce the computational cost.
Keywords :
Hadamard transforms; cryptography; speech coding; speech intelligibility; Hadamard transform; computational cost; frequency domain; key space; recovered speech quality; residual intelligibility; speech scrambling; telephone communication; Bandwidth; Computational efficiency; Computational modeling; Cryptography; Frequency domain analysis; Information security; Passband; Space technology; Speech; Telephony;
Conference_Titel :
Signal Processing, 2002 6th International Conference on
Print_ISBN :
0-7803-7488-6
DOI :
10.1109/ICOSP.2002.1180094
