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Engineering Brief

Measuring Speech Intelligibility Loss in Single-Driver Panel Loudspeakers

Authors: Anderson, David; Bocko, Mark F.

AES Convention 139 · Paper 228 · October 2015

Abstract

The impulse response of a panel loudspeaker with a single moving-coil driver contains ringing due to the resonant frequencies, but the implication of this type of response for intelligible reproduction of speech signals is the subject of some debate. The impulse responses of three examples of such loudspeakers of various sizes and materials were measured in an anechoic environment and compared to that of a conventional speaker. Reverberation effects are clear and calculation of the Speech Transmission Index (STI) confirms a loss of intelligibility; the STI values of the plate loudspeakers are 6% to 13% lower than that of the conventional speaker. Spectrograms of reproduced speech by each plate also show a considerable loss of detail.

Details

Published in
AES Convention 139
AES Convention
139
Paper number
228
Publication date
October 6, 2015
Affiliation
University of Rochester, Rochester, NY, USA (See document for exact affiliation information.)
Type
Engineering Brief