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Design theory of microphone arrays f...

Macomber, Dwight Frank.

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Design theory of microphone arrays for teleconferencing.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Design theory of microphone arrays for teleconferencing./
Author:	Macomber, Dwight Frank.
Description:	225 p.
Notes:	Adviser: C. Nelson Dorny.
Contained By:	Dissertation Abstracts International62-11B.
Subject:	Engineering, Electronics and Electrical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3031692
ISBN:	0493441875

Design theory of microphone arrays for teleconferencing.
Macomber, Dwight Frank.

Design theory of microphone arrays for teleconferencing. - 225 p.

Adviser: C. Nelson Dorny.

Thesis (Ph.D.)--University of Pennsylvania, 2001.

Room reverberation and interfering acoustical noise lower the quality of speech transmission in teleconferencing. Conventional solutions for speech capture that suppress pickup of reverberation and interference typically constrain the motion of the speaker, encumber the speaker physically, or make it difficult for many different speakers to easily participate. These impediments result from cables, radio and headset microphones, or so-called house microphones located at fixed positions. Microphone arrays and matched-filter processing have been proposed as solutions to this sound capture problem. In part because the behavior of arrays in reverberant acoustic spaces has not been well quantified, there have been no guidelines for designing effective teleconference arrays. The principal goal of this work is the development of general design rules for speech acquisition arrays.

ISBN: 0493441875Subjects--Topical Terms:

626636
Engineering, Electronics and Electrical.

Design theory of microphone arrays for teleconferencing.
LDR:03335nam 2200301 a 45 001 931362
005 20110429
008 110429s2001 eng d
020 $a 0493441875
035 $a (UnM)AAI3031692
035 $a AAI3031692
040 $a UnM $c UnM
100 1 $a Macomber, Dwight Frank. $3 1254904
245 1 0 $a Design theory of microphone arrays for teleconferencing.
300 $a 225 p.
500 $a Adviser: C. Nelson Dorny.
500 $a Source: Dissertation Abstracts International, Volume: 62-11, Section: B, page: 5284.
502 $a Thesis (Ph.D.)--University of Pennsylvania, 2001.
520 $a Room reverberation and interfering acoustical noise lower the quality of speech transmission in teleconferencing. Conventional solutions for speech capture that suppress pickup of reverberation and interference typically constrain the motion of the speaker, encumber the speaker physically, or make it difficult for many different speakers to easily participate. These impediments result from cables, radio and headset microphones, or so-called house microphones located at fixed positions. Microphone arrays and matched-filter processing have been proposed as solutions to this sound capture problem. In part because the behavior of arrays in reverberant acoustic spaces has not been well quantified, there have been no guidelines for designing effective teleconference arrays. The principal goal of this work is the development of general design rules for speech acquisition arrays.
520 $a Expressions for the array performance measures of signal-to-reverberation ratio and signal-to-interference ratio are derived using statistical acoustics, then verified by computer simulation using the image method of geometric room acoustics. The analysis is facilitated by assuming the reverberant sound field to be diffuse. The assumption is valid above approximately 250 Hz. All work assumes omnidirectional sources and sensors mounted on walls with low absorption. Array sensors should be placed close to, and roughly equidistant to the source, yet as far from each other as possible. The aperture of a full-band array should extend into three dimensions. Wall and ceiling mounting of sensors is recommended. Relations specify the number of sensors required for various room volumes, room absorptions, and source-to-sensor distances. A planar ceiling array expands the range of motion for speakers by widening the focal region above 300 Hz. Off-line audition of a 32-sensor array in a 60-cubicmeter room with a reverberation time of .63 second indicates that subjectively good array performance may be obtained using processing with matched filters truncated at 30 milliseconds. A listening test using audio from eight virtual arrays operating in a simulated room provides indications of their subjective performance relative to a single microphone operating at four different distances. An array with 32 wall-mounted sensors was constructed in an conference room. Off-line output of the array confirms the general principles of the design theory.
590 $a School code: 0175.
650 4 $a Engineering, Electronics and Electrical. $3 626636
650 4 $a Physics, Acoustics. $3 1019086
650 4 $a Speech Communication. $3 1017408
690 $a 0459
690 $a 0544
690 $a 0986
710 2 0 $a University of Pennsylvania. $3 1017401
773 0 $t Dissertation Abstracts International $g 62-11B.
790 $a 0175
790 1 0 $a Dorny, C. Nelson, $e advisor
791 $a Ph.D.
792 $a 2001
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3031692