Change search
ReferencesLink to record
Permanent link

Direct link
Real-Time Simulation of Reduced Frequency Selectivity and Loudness Recruitment Using Level Dependent Gammachirp Filters
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

A real-time system for simulating reduced frequency selectivity and loudness recruitment was implemented in the C programming language. The finished system is an executable program where a user can input a sound file and a list of hearing losses. As the program runs, a processed version of the input signal is played back. The processed signal includes the effects of either one or both the hearing impairments. The system, called a hearing loss simulator, is based on the dynamic compressive gammachirp filter bank. Each channel in the filter bank is signal dependent, meaning the filter characteristics are changed according to an estimate of the signal level. Reduced frequency selectivity was simulated by influencing the filter characteristics by a hearing loss value in addition to the signal level. This produced masking effects, and was able reduced the detail of spectral envelopes. Loudness recruitment was simulated by scaling each sample based on the signal level. This technique accounted for abnormal growth of loudness-level and elevated absolute thresholds. It made low sounds disappear while leaving loud sounds closer to their original level.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2012. , 75 p.
Keyword [no]
ntnudaim:7248, MTKOM kommunikasjonsteknologi, Lyd- og bildebehandling
URN: urn:nbn:no:ntnu:diva-18470Local ID: ntnudaim:7248OAI: diva2:565961
Available from: 2012-11-08 Created: 2012-11-08

Open Access in DiVA

fulltext(20785 kB)462 downloads
File information
File name FULLTEXT01.pdfFile size 20785 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)45 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf
attachment(132 kB)41 downloads
File information
File name ATTACHMENT01.zipFile size 132 kBChecksum SHA-512
Type attachmentMimetype application/zip

By organisation
Department of Electronics and Telecommunications

Search outside of DiVA

GoogleGoogle Scholar
Total: 462 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 127 hits
ReferencesLink to record
Permanent link

Direct link