Inspec keywords: transforms; compressed sensing; matrix algebra; signal reconstruction; data compression; speech coding; cryptography

Other keywords: speech signal encryption; noise figure 48.203 dB; SNR; speech compression; PESQ; spectral segmental signal-to-noise ratio; noise figure -36.813 dB; speech reconstruction; contourlet transform; perceptual evaluation speech quality; chaotic compressive sensing matrix; CS; noise figure 41.097 dB; signal sparsity

Subjects: Integral transforms; Speech and audio coding; Signal processing and detection; Algebra; Integral transforms; Algebra; Speech processing techniques; Cryptography