Single-channel speech dereverberation in acoustical environments

, Article Proceedings Elmar - International Symposium Electronics in Marine ; 2014 Joorabchi, M ; Ghorshi, S ; Sarafnia, A ; Sharif University of Technology

2014

Abstract

Reverberated speech signals in acoustical environments produces some problems such as reducing speech intelligibility, distinguishing speakers, locating source, quality for hands-free telephony, hearing aid, etc. Adaptive filters can be applied to reduce the reverberation effects or to dereverberate the received speech signals at microphone. In this paper a dereverberation method is proposed by applying an inverse filter to the received speech signals. Different values of the Room Impulse Response are used in the dereverberation procedure and the results are compared. The results show a significant improvement in the quality of the received signal for the desired reverberant environment....

Comparative analysis of speech dereverberation in noisy acoustical environments

, Article 2015 28th IEEE Canadian Conference on Electrical and Computer Engineering, CCECE 2015, 3 May 2015 through 6 May 2015 ; Volume 2015-June, Issue June , June , 2015 , Pages 1248-1253 ; 08407789 (ISSN) Joorabchi, M ; Ghorshi, S ; Sarafnia, A ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2015

Abstract

Reverberated speech signals in noisy acoustical environments cause some problems such as reducing speech intelligibility, distinguishing speakers, locating source, quality for hands-free telephony, hearing aid, etc. Adaptive filters can be applied to suppress the interfering signals and reduce the reverberation effects or to dereverberate the received speech signals at microphone. In this paper, Bayesian State-Space Kalman and Wiener filters have been employed to reduce the effect of noise on received speech signal and their results are compared. Also, a dereverberation method is proposed by applying an inverse filter to the received speech signals to reduce the effect of reverberation on...

Noise reduction using multi-channel FIR warped wiener filter

, Article 13th International Multi-Conference on Systems, Signals and Devices, SSD 2016, 21 March 2016 through 24 March 2016 ; 2016 , Pages 531-536 ; 9781509012916 (ISBN) Shamsa, A ; Ghorshi, S ; Joorabchi, M ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2016

Abstract

Enhancing the speech quality is the aim of noise reduction techniques. In order to have a desirable speech signal, it is necessary to eliminate the hearing fatigue and enhance the quality and intelligibility of speech signal. The present of additive noise causes the signal to degrade where the noise reduction techniques intend to remove the effect of noise on speech signals. However, removing the noise should not harm the speech signal when the signal is going to be heard. In this regard, Wiener filter can be used to promote the quality and intelligibility of the noisy signals. This paper explores the performance of multi-channel Wiener filter accompanied by Warped FIR filter

Speech denoising based on wavelet transform and wiener filtering

, Article 2023 8th International Conference on Frontiers of Signal Processing, ICFSP 2023 ; 2023 , Pages 43-46 ; 979-835030879-2 (ISBN) Joorabchi, M ; Ghorshi, S ; Naderahmadian, Y ; Sharif University of Technology

Institute of Electrical and Electronics Engineers Inc 2023

Abstract

This paper presents a combinational method of Wavelet Transform and Adaptive Filter to reduce distortion that has been caused by interference noise. The procedure makes use of a Wiener filtering to improve and enhance the quality of the speech signal. The proposed method is tested for a couple of noisy speech signals with different SNRs in the range of -5 dB to 15 dB. In this method we aim to inspect the enhancement of noisy speech signals in more practical conditions. Thus, not only is the process employed on noisy speech signals distorted by Additive White Gaussian Noise (WGN) but also it is practiced on environmental noises such as CAR noise, etc. The results show improvement of noise...

Single-Channel Speech Dereverberation in Noisy Acoustical Environments

, M.Sc. Thesis Sharif University of Technology Joorabchi, Marjan (Author) ; Ghorshi, Mohammad Ali (Supervisor)

Abstract

In speech processing, reflections of sound wave in a bounded space are considered as speech reverberation. Although for musical instruments and their related recording devices these reflections are useful, however, some other applications face serious problems receiving them along with speech signal. Reverberation causes speech degradation and intelligibility as well as highly quality reduction. Dereverberation algorithms are essential for Automatic Speech Recognition (ASR), telecommunication and hearing aid devices, which are some of the mostly used applications. While dereverberation itself is a challenging problem, dereverberate a speech signal recorded only by one microphone (channel)...

Runtime Analysis of Self-adaptive Systems

, Ph.D. Dissertation Sharif University of Technology Bagheri, Maryam (Author) ; Movaghar, Ali (Supervisor) ; Sirjani, Marjan (Supervisor)

Abstract

Increasing the complexity of software systems, their ubiquitous presence in the human activities, and necessity to preserving the functional and nonfunctional requirements of the systems under an uncertain environment, increase the need for self-adaptive systems. A self-adaptive system changes its structure and behaviors in response to changes in its environment and the system itself. A key research challenge in the self-adaptive community is to guarantee that the system fulfills its requirements. This issue can be addressed by employing formal methods during the design of the software systems. However, the assurance techniques should be used during the execution of the system as well as the...

Design and Manufacturing of Gradient Cellular Tibial Stem for Total Knee Replacement

, M.Sc. Thesis Sharif University of Technology Taheri, Atiyeh (Author) ; Farahmand, Farzam (Supervisor) ; Bahrami Nasab, Marjan (Co-Supervisor)

Abstract

Loosening of uncemented tibial component is one the most common causes of total knee prosthesis failure which is a result of short-term factors such as instability and incomplete osseointegration as well as long-term factors such as peri-prosthetic stress shielding and bone atrophy. Porous cellular structures for tibial stem have been considered as a solution to this problem. This project is aimed to achieve an optimal gradient porous cellular design of tibial stem that in addition to sufficient mechanical strength, provides a perfect osseointegration and prevents bone resorption by incorporating appropriate porosity size, small micro-motion and favorable stress distribution on bone. A...

Theoretical Investigation of Quantum Optical Amplifiers in Quantum Communications

, M.Sc. Thesis Sharif University of Technology Marjan, Negar (Author) ; Bahrampour, Alireza (Supervisor) ; Bathaee, Marzieh Sadat (Co-Supervisor)

Abstract

Signal transmission of information on noiseless and lossy channels is an important issue in data transmission. Using the amplifier in the transmission channels is a good solution to help send information on longer channels. In classical communication, information can be coded in the amplitude or phase of the field and an amplifier is responsible for amplifying these parameters. If we consider the conditions ideal and ignore electrical noises, Classical mechanics does not impose any restrictions on the amplification of arbitrary classical signals. Instead, in quantum telecommunications the information encoded on the quadrature of the electromagnetic field are mounted on quantum states, such...