Conventional speech scramblers have three disadvantages, including heavy communication overhead, signal features underexploitation, and low attack resistance. In this study, we propose a scrambling-based speech encryption scheme via compressed sensing (CS). Distinguished from conventional scramblers, the above problems are solved in a unified framework by utilizing the advantages of CS. The pre...

Compressed sensing (CS) is a sampled approach on signal sparsity-base, and it can effectively extract the information which is contained in the signal. This paper presents a noisy speech enhancement new method based on CS process. Algorithm uses a voice sparsity in the discrete fast Fourier transform (Fast Fourier transform, FFT), and complex domain observation matrix is designed, and the noisy...

Low bitrate speech coding usually requires robustness to a wide range of speakers. The problem which we report on here is one where the compression rate must be maximized for the purposes of archival, but the compressed information must be available at a later date for the purposes of identifying a new speaker. The new speaker may or may not have been recorded in the archived database. As would...

In mobile communication systems, bandwidth is a precious commodity, and service providers are continuously faced with the challenge of accommodating more users within a limited allocated bandwidth. Linear Predictive Coding (LPC) offers low bit-rate speech coding that can be used to meet this challenge. The lower the bit rate at which the coder can deliver toll quality speech, the more speech ch...

Time-compressed speech can be used in a variety of application areas including teaching, aids to the disabled, and human-computer interfaces. Studies have indicated that listening to teaching materials twice that have been speeded up by a factor of two is more effective than listening to them once at normal speed [Sti69]. Timecompressed speech has been used to speed up message presentation in v...

Hynek Hermansky, Eric A. Wan, and Carlos Avendano Oregon Graduate Institute of Science & Technology Department of Electrical Engineering and Applied Physics P.O. Box 91000, Portland, OR 97291 ABSTRACT Finite Impulse Response (FIR) Wiener-like lters are applied to time trajectories of cubic-root compressed short-term power spectrum of noisy speech recorded over cellular telephone communications....

When the audio and visual portions of a speech stimulus are presented synchronously, the resulting enhancement in intelligibility is generally much larger than the one obtained when the audio and visual stimuli are presented sequentially. However, perfect synchronization is not required to obtain a substantial audiovisual (AV) benefit: many studies have shown that AV integration is maximum when...

In this study, based on directional representation for palmprint images and compressed sensing, we propose a novel approach for palmprint recognition. Firstly, the directional representation for appearance based approaches is obtained by the anisotropy filter to efficiently capture the main palmprint image characters. Compared with the traditional Gabor representations, the new representations ...

Time-parallel simulation (TPS) is a simulation technique which partitions the timespan of the simulation into independently executed simulation segments. Unless the simulated process is regenerative, the output of TPS is only an approximation of the corresponding serial simulation. In previous work, we have adapted TPS to the simulation of wireless ad hoc networks. By prefixing the measured sim...

The comprehensibility of materials compressed and then .expanded by means of an electromechanical process was tested with 280 Army inductees divided into groups of high and low mental aptitude. Three short listening selections relating to military activities were subjected to compression and compression-expansion to produce seven versions. Data indicate that expanding previously compressed mate...