Objective evaluation of speech quality over telecommunication networks using neural networks.
Item
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Title
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Objective evaluation of speech quality over telecommunication networks using neural networks.
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Identifier
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AAI9820564
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identifier
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9820564
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Creator
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Meky, Mohamed Mohamed.
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Contributor
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Adviser: Tarek N. Saadawi
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Date
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1998
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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Throughout this research, we have introduced new perceptually objective measure techniques that can be used to predict speech quality over telecommunication systems. In these techniques, we emulate several known features of perceptual processing of speech sounds by human ear (including critical-band masking, equal loudness, and the intensity-loudness power law operations) to map the speech power spectrum into auditory power spectrum which assumed to represent the information conveyed by the auditory nerve to the brain. Then, we have used the neural network technique to map the effectively extracted features, that derived from the auditory spectrum, into the corresponding speech quality. The results indicate that our proposed techniques are reliable and robust in evaluating the coded speech quality and they are highly correlated to human responses across a wide range of quality levels and for a wide range of speech coding techniques.;From the speech coder designing point of view, our objective measure techniques can be used in development, testing, refinement, deployment, or standardization of algorithms and equipment that process speech signals.;Furthermore, in this research, we have presented a discussion of the issues involved in predicting the degradation impact of cell loss and jitter impairments on speech quality over ATM networks. Prediction the speech quality over ATM networks helps in designing the speech coders and controlling their electrical parameters to maintain certain speech quality.;From the network design point of view, the proposed techniques can be used to assign upper cell loss and jitter limits for the suggested coding algorithms to be used over ATM networks. Also degradation information produced by the proposed techniques can be used to aid in designing of the management, congestion control protocols and assignment rules that achieve certain quality of service (QOS) requirements.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
