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 27 for “"voice communication"”.
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A line-of-sight voice communication system with optoelectric fibers
… the electronic hardware for a vest-mounted voice communication system that could incorporate such fibers. In this thesis, I explored initial designs for a receiver circuit and fully developed a head-mounted infrared transmitter module. As optoelectric fibers with sufficient sensitivity and …
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Convivo communicator : an interface-adaptive voice over IP system for poor quality networks
… a VoIP system designed to provide reliable voice communication for poor quality networks, especially those found in rural areas of the developing world. Convivo introduces an original approach to maintain voice communication interaction in presence of poor network performance: an …
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Quality of service analysis for audio over cellular voice networks and cellular wireless wide area networks
… transfer. We believe WWANs can be availed for voice communications employing Voice Over IP technologies. Such a communication will be of better quality and offer higher resilience compared to voice communication over a cellular phone (using cellular voice networks). We present a Quality of …
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The Impact of the Simulated Digital Data Radio Communication Induced Interference on Voice Radio Communication
<p>The transition of air/ground communications, from its present analog structure to a new digital communications architecture, will span a 10-year time frame. Testing to date indicates that the potential for interference from the digital system to the analog system would be critical, especially …
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Quality-aware voice convergecast in mobile low power wireless networks
… have shown the critical need for reliable voice communication for mobile users. Low power ad hoc wireless networks have become a promising alternative for voice communication in emergency scenarios because of their low cost and portability. In order to increase communication amongst moving …
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Simulation and performance analysis of Cellular Digital Packet Data
As the wireless telecommunications industry becomes more widely accepted, the need for mobile data communication has followed the rise in mobile voice communication. Cellular Digital Packet Data (CDPD) offers an unobtrusive data service that overlays the existing Advanced Mobile Phone Service …
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The effects of stable and malleable expectancies, communication channel, and self-efficacy on conversation behavior and interpersonal perception
… affect behavior and perception in audio/voice or face-to-face communication. The current research tested 100 mixed-sex dyads to compare behavioral and perceptual effects of expectancies across two different types of mediated communication channels: computer-mediated communication (CMC) …
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Calculations of the effects of peak clipping on speech-like signals
… the average power of a peak power limited voice communication transmitter. Although the clipping process introduces distortion, articulation tests have shown that clipped speech remains highly intelligible. Using idealizations of vowel sounds based on the mechanism of speech production, …
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Robotic user interface enabled interactive dialogue with intelligent spaces
… computing environments by natural means such as voice communication. However, users of the Intelligent Room at MIT CSAIL, a ubiquitous environment, have reported dissatisfaction communicating with the room due to the absence of a focal point and the room's inability to hold a dialogue. To enrich …
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Satellite Data Communications Link Requirements for a Proposed Flight Simulation System
… the requirements necessary for data and voice communication via satellite, linking Embry-Riddle Aeronautical University (ERAU) and other flight training facilities. The proposed research was conducted following a descriptive method of collecting information, generating and analyzing data, …
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Using a low-bit rate speech enhancement variable post-filter as a speech recognition system pre-filter to improve robustness to GSM speech
… through GS1 (Global System for Mobile Communications) voice communication channels (GSM speech). This degradation is mainly due to GSM speech coding and GSM channel noise on speech signals transmitted through the network. This poor recognition of GSM channel speech limits the use of …
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The evolution and adoption of optical interconnect cables
Optical technologies are now ubiquitous in data communication, telecommunication, and computing networks for transmission distances beyond a few meters. The use of optical to transmit voice communication has changed the nature of the industry and been driving photonic component innovation for the …
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A secure radio-frequency assistive listening device for hard of hearing people
… in this thesis. The device combines digital voice encoding technology with the direct sequence spread spectrum technique to provide a secure digital voice communication channel for hearing impaired people. It is shown that the CCITT 0.722 and the digital voice encoding algorithms are …
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Systems thinking applied to a telecommunication startup company : The nexiwave case
Telecommunication technology has had a profound impact on our daily lives. It has enabled organizations to be more competitive by reducing the need for physical proximity and fostering collaboration. In recent years especially, data networks have been especially prominent, with the obvious example …
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SimPhony : voice group communication
Communication is vital in any workplace. However, as workers become less tied to their desktops and computers, the need to provide them with a flexible, easy to use, mobile method of communication becomes more necessary. This is particularly true in "non-traditional" workplaces like factories or …
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Analysis of airspace traffic structure and air traffic control techniques
… of the traffic. Deeper pilot-controller voice communication analysis indicated that groupings by flight plan received consistent and repeatable sequences of commands, which were identified as techniques. These repeated modifications generated patterns in the traffic, which were naturally …
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A Practical Approach to Rapid Prototyping of SCA Waveforms
… Tactical Radio System (JTRS), and the Software Communication Architecture (SCA) comes the need for a rapid prototyping approach to radio design. In the past, radios have traditionally been designed to have a static implementation with the express goal of implementing a specific type of …
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A unified methodology for the management of time-dependent information in aeronautical systems
… of aeronautical datalinks as an alternate communication modality will enable direct connectivity between airborne and ground-based computers. The resulting ability of automation to accomplish communication tasks without human intervention will make feasible a variety of decision-support …
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Peer-to-peer interactive 3D media dissemination in networked virtual environments
… shortcoming in current NVEs concerns the voice communication between virtual world participants. To enable the creation of an aural soundspace around the user that matches the visual experience, audio streams sent by different speakers cannot be mixed until they reach their destinations. I …
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Security in Packet-Switched Land Mobile Radio Backbone Networks
… backbone networks to handle their future communication needs. Due to the unique demands of packet-switched backbone networks for LMR, it may not be wise to carry over the previously implemented security methods used with circuit-switch systems or to treat an LMR backbone as a regular …
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