Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"speech quality"”.
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Objective Evaluation of Tracheoesophageal Speech Quality
… accurate and reliable ways of measuring voice quality in speech communications systems and in abnormal voice assessment and rehabilitation. It is also beneficial to have objective measures of speech quality as opposed to subjective, in order to save time, money and other such resources. …
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Machine learning based speech quality prediction
Instrumental speech quality prediction is a long-studied field in which many models have been presented. However, in particular, the single-ended prediction without the use of a clean reference signal remains challenging. This thesis studies how recent developments in machine learning can be …
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Research on objective speech quality measurements
This is a thesis dissertation on objective speech quality measures. Two objective measures, Enhanced Modified Bark Spectral Distortion (EMBSD) and Perceptual Evaluation of Speech Quality (PESQ) were included in this study. The scope of the study covers the evaluation of EMBSD and PESQ in predicting …
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Single-ended non-intrusive speech quality monitoring in VoIP
… networks in the next few years. However, speech quality in VoIP is not guaranteed, due to various new impairments introduced by Internet and Internet Protocol (IP) terminals. Evaluating VoIP speech quality in a non-intrusive fashion is challenging, as a reference signal is not …
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THE RELATIONSHIP BETWEEN ACOUSTIC FEATURES OF SECOND LANGUAGE SPEECH AND LISTENER EVALUATION OF SPEECH QUALITY
Second language (L2) speech is typically less fluent than native speech, and differs from it phonetically. While the speech of some L2 English speakers seems to be easily understood by native listeners despite the presence of a foreign accent, other L2 speech seems to be more demanding, such that …
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Simulation of VSELP speech encoder for mobile channels
… digital cellular standard uses the 8 kbps VSELP speech coder to accommodate more users in the same bandwidth. This standard is currently being introduced in several markets. Performance evaluation of the speech coder in terms of speech quality is done for different channel conditions using the …
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Blind Estimation of Perceptual Quality for Modern Speech Communications
Modern speech communication technologies expose users to perceptual quality degradations that were not experienced earlier with conventional telephone systems. Since perceived speech quality is a major contributor to the end user's perception of quality of service, speech quality estimation has …
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Single-Microphone Speech Dereverberation: Modulation Domain Processing and Quality Assessment
In a reverberant enclosure, acoustic speech signals are degraded by reflections from walls, ceilings, and objects. Restoring speech quality and intelligibility from reverberated speech has received increasing interest over the past few years. Although multiple channel dereverberation methods …
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Low bit-rate speech encoding for digital mobile radio
The need for low bit-rate speech coding is the result of growing demand on the available radio bandwidth for mobile communications both for military purposes and for the public sector. To meet this growing demand it is required that the available bandwidth be utilized in the most economic way to …
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Parkinsonian Speech and Voice Quality: Assessment and Improvement
… 90% of people impaired with PD develop voice and speech disorders. Speech production impairments in PD subjects typically result in hypophonia and consequently, poor speech signal-to-noise ratio (SNR) in noisy environments and inferior speech intelligibility and quality. Assessment, monitoring, …
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Quality of service (QoS) analysis frameworkn for text to speech (TTS) services
Quality of service (QoS) evaluations is significant and necessary for text to speech web service applications. Text to speech media conversion quality measurements has general and specific mechanisms for its functional and nonfunctional requirements. The main objective of this thesis is to …
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Efficient narrow-band speech transmission over land mobile channels.
This thesis addresses the problems of speech quality, and channel bandwidth efficiency, for speech transmission in mobile communications.In the first part, a flexible, real-time, programmable, mobile radio channel simulator is proposed. The conventional basic configuration of the simulator was …
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An asynchronous telephone speech scrambler with a new key generation method
The design of an asynchronous telephone speech scrambler is proposed and its performance experimentally studied. The scrambler transforms the speech signal into a scrambled form by permuting the frequency coefficients of the speech signal. These coefficients are permuted in pairs instead of …
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Noise reduction schemes for digital hearing aids and their use for the hearing impaired
… for noise reduction in hearing aids. A speech pause detection algorithm is proposed which maintains a low false-alarm rate over a wide range of signal-to-noise ratios. This facilitates its application for noise estimation in noise reduction algorithms. Comprehensive evaluations of the …
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A psychoacoustically motivated speech enhancement system
… method is introduced to perform enhancement of speech degraded by acoustic noise using the psychoacoustic property of masking. The goal of this algorithm is to preserve the natural quality of the noise while keeping the speech perceptually intact. Distortion masking principles based on prior …
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Speech Enhancement Methods Based on CASA Incorporating Spectral Correlation
… analysis (CASA) has shown a great potential for speech enhancement compared to some statistical model-based methods. A challenge for CASA is how to estimate binary mask or ratio mask effectively in each time-frequency (T-F) unit. In this thesis, four speech enhancement methods with binary mask or …
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Implementation of a variable rate vocoder and its performance analysis
… and graceful degradation of performance (voice quality) in the presence of multiple access interference are the significant benefits of CDMA. Spectral efficiency is a key issue in mobile communications. The use of vocoders reduces the average bit transmission rate for each user, thereby reducing …
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Neural Enhancement Strategies for Robust Speech Processing
In real-world scenarios, speech signals are often contaminated with environmental noises, and reverberation, which degrades speech quality and intelligibility. Lately, the development of deep learning algorithms has marked milestones in speech- based research fields e.g. speech recognition, spoken …
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Development, perceptual evaluation, and acoustic analysis of amplitude-based F0 control in Electrolarynx speech
… but current EL devices produce a mechanical speech quality which has been largely attributed to the lack of natural fundamental frequency (F0) variation. In order to improve the quality of EL speech, the present study aimed to develop and evaluate an automatic F0 control scheme, in which F0 …
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Speech Coder using Line Spectral Frequencies of Cascaded Second Order Predictors
A major objective in speech coding is to represent speech with as few bits as possible. Usual transmission parameters include auto regressive parameters, pitch parameters, excitation signals and excitation gains. The pitch predictor makes these coders sensitive to channel errors. Aiming for …
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