Analysis of coincident microphone array recordings for auralization applications
Başlık çevirisi mevcut değil.
- Tez No: 400123
- Danışmanlar: PROF. FİONN MURTAGH
- Tez Türü: Doktora
- Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2004
- Dil: İngilizce
- Üniversite: Queen's Unıversıty Belfast
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
This thesis investigates the analysis of coincident microphone array recordings forauralization applications. Auralization, or rendering audible, aims at reproducingthe sound field of a source in a space by binaural processing, stereo systems,multichannel systems or wave field synthesis. A common requirement for theseapplications is effectively conveying the directional information of the sound field.To achieve this, the directional information should be extracted in the first place.The directional information of the sound fields is defined by the locationsof the sound sources and the image sources. Localization of sound sources is awell-visited problem and several methods exist for its solution employing the microphonearrays made up of physically separated microphones, i.e., non-coincidentmicrophone arrays. These use the time-delay-of-arrival information which is notreliable in the presence of reverberation.Using coincident microphone array recordings for the analysis of directionalsound fields provides advantages over non-coincident microphone arrays in termsof physical handling, interfacing and data processing. However, wavefronts arrivesimultaneously at the elements of a coincident microphone array and thereforethere is no time-delay-of-arrival between the captured sounds. This requires developingnew methods.This thesis proposes two approaches for the analysis of coincident microphonearray recordings. The first approach is available if the original sound signal isavailable for deconvolution. Directional room impulse responses are calculated,which are further analyzed for source localization and room size and shape estimationbased on the geometrical relations derived from the image source method.The second approach depends on the wavelet packet decomposition of directionalrecordings for decreasing the effect of reflections which enables the investigationof the sound source direction in reverberant environments. Approximatedirectional room impulses calculated with the knowledge of the source directionalso reveals information about the arrival time, directions and levels of the reflections.The analysis of the coincident microphone array recordings constitute the initialstep of auralization. Reproducing the source location information and thearrival directions of the reflections constitutes the next step of auralization andrequires special attention. Some of the visited implementation aspects includesmoothing the head-related transfer functions to reduce the filter orders for binauralauralization, reconstructing the direction information of processed B-formatsignals for stereo reproduction, correcting the effect of off-centre stereo listeningthrough assistant headphones and justifying the usage of coincident microphonearrays for the wave field analysis.
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