BLUETOOTH RECEIVER AND BANDWIDTH-EXTENSION ALGORITHMS FOR TELEPHONE-ASSISTIVE APPLICATIONS
| Author: |
Qian, Haifeng |
| Advisor: |
Philip Loizou |
| URL: |
http://www.utdallas.edu/~loizou/thesis/haifeng_ms_thesis.pdf
" target="_blank"> http://www.utdallas.edu/~loizou/thesis/haifeng_ms_thesis.pdf
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| Completion Date: |
May 2002 |
| Degree: |
M.Sc./M.A. |
| Institution: |
University of Texas at Dallas |
| Abstract: |
This thesis addresses the problem of helping hearing-impaired people to use telephones. There are two aspects of this work: a Bluetooth-based wireless phone adapter and a bandwidth-extension algorithm. Built upon the Bluetooth technology, the proposed phone adapter routes the telephone audio signal to the hearing aid or the CI processor wirelessly, and hence disables environmental noise and interference. The proposed bandwidth-extension algorithm has the potential to increase speech intelligibility for the hearing-impaired people by estimating a wide-band signal from the narrow-band telephone signal. This is done by a piecewise linear estimation based on line spectral frequencies, and a statistical speech-frame classification technique based on Hidden Markov Models integrated to overcome the drawback of conventional bandwidth extension algorithms. The phone adapter was tested by CI users, and the proposed algorithm was evaluated by objective measures. Both results showed good performance. |
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