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A low-delay digital wireless voice-communication system
2004 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis describes the implementation of a digital hearing aid system. This system goes under the name BlueEar. The BlueEar system is a multi-channel bi-directional communication device designed to interface with standard hearing aid equipment already on the market. The main challenges in designing a good digital hearing aid system are meeting the strict delay constraints along with minimal power consumption while still providing audio quality well above standard telephone toll-quality speech. This thesis is focused on describing the design and implementation of key components such as channel-coding, source-coding, audio-equalizer, error-concealment scheme, and a user-interface. It is shown that, with some tuning of the protocol timing parameters, a four-channel system with a delay of about 12.5~ms can be implemented on the BlueEar prototype hardware. The results also include suggested changes in the hardware design, providing impoved synchronization and reduced power consumption. The performance of the audio-equalizer, error-concealment scheme, radio and channel-coding is evaluated and verified against measurements on the BlueEar platform.

Place, publisher, year, edition, pages
Keyword [en]
Technology, audio equalizer, channel-coding, source-coding, convolutional, codes, error concealment, low-delay
Keyword [sv]
URN: urn:nbn:se:ltu:diva-51227ISRN: LTU-EX--04/141--SELocal ID: 872037b3-7f10-49a2-b456-1a5dc1fe6c10OAI: diva2:1024589
Subject / course
Student thesis, at least 30 credits
Educational program
Computer Science and Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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