Directivity of human talkers

(1)

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Directivity of human talkers

Chu, W. T.; Warnock, A. C. C.; Guy, J-C.

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(2)

Directivity of human talkers

Chu, W.T.; Warnock, A.C.C.; Guy, J-C.

www.nrc.ca/irc/ircpubs

ORAL-411

(3)

Directivity of human talkers

National Research

Council Canada

National Research

Council Canada

Conseil national

de recherches Canada

Conseil national

de recherches Canada

Canada

W.T. Chu, A.C.C. Warnock and J-C. Guy

Indoor Environment Program, Acoustics

Institute for Research in Construction

National Research Council

Ottawa, Ontario

W.T. Chu, A.C.C. Warnock and J-C. Guy

Indoor Environment Program, Acoustics

Institute for Research in Construction

National Research Council

Ottawa, Ontario

(4)

Background

n

Project funded in part by Public

Works and Government Services

of Canada

n

Re-assessment of open-offices

including team-style offices

(5)

ASA December 2001

Project: Team style open

offices

n

Orientation of

occupants is a

factor that can be

controlled by

orientation of

work stations

n

Need typical

levels and

directivity to make

calculations

A

B

C

D

(6)

Microphone

Array

-50º

+90º

15º increments

(7)

ASA December 2001

Measurements and Analysis

n

Almost spherical coverage, 15

13-mm free-field condenser

microphones

n

Two synchronized 8-channel digital

tape recorders

n

40 subjects, 20 male, 20 female

n

30 second L

_eq

for each subject at

each angle

(8)

Results - A-weighted

-10 -8 -6 -4 -2 0 2 4 0 30 60 90 120 150 180 210 240 270 300 330 -10 -8 -6 -4 -2 0 2 4

All

Male

Female

R

e

la

ti

v

e

Le

v

e

l,

d

B

A

Vertical Plane

-8 -6 -4 -2 0 0 30 60 90 120 150 180 210 240 270 300 330 -8 -6 -4 -2 0

All

Male

Female

Horizontal plane

R

e

la

ti

ve

L

e

vel

,

dB

A

(9)

ASA December 2001

Moreno et al. Horizontal plane

Azimuth, degrees

4000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 160 180 Relati ve Le vel, dB 2000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 160 180 Relati ve Le vel, dB 1000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 160 180 Relati ve Le vel, dB 500 Hz -15 -10 -5 0 5 0 20 40 60 80 100 120 140 160 180 Relati ve Le vel, dB

(10)

Moreno et al. Vertical plane

500 Hz -15 -10 -5 0 5 10 0 60 120 180 240 300 360 Re la ti v e L e v e l, d B 1000 Hz -25 -20 -15 -10 -5 0 5 0 60 120 180 240 300 360 Re la ti v e L e v e l, d B 2000 Hz -25 -20 -15 -10 -5 0 5 Re la ti v e L e v e l, d B 4000 Hz -25 -20 -15 -10 -5 0 5 Re la ti v e L e v e l, d B

(11)

ASA December 2001

Dunn and Farnsworth

250-500 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 Azimuth, degree R e la ti v e Le v e l, d B 700-1000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 Azimuth, degree R e la ti v e Lev el , dB 1400-2000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 Azimuth, degree R e lat ive Le v e l, d B 2800-4000 Hz -20 -15 -10 -5 0 5 0 20 40 60 80 100 120 140 Azimuth, degree R e la ti ve L e ve l, d B

(12)

McKendree

Male 500 Hz -15 -10 -5 0 5 0 30 60 90 120 150 180 R e lative L evel, dB Male 1000 Hz -15 -10 -5 0 5 0 30 60 90 120 150 180 R e lative Level, d B Male 2000 Hz -15 -10 -5 0 5 Relat ive Level, dB Male 4000 Hz -15 -10 -5 0 5 R ealtive Le v e l, dB

NRC

(13)

ASA December 2001

Comparison

with B&K HTS

-12 -10 -8 -6 -4 -2 0 2 0 30 60 90 120 150 180 210 240 270 300 330 -12 -10 -8 -6 -4 -2 0 2

All

B&K HTS

Horizontal plane

R

e

la

ti

ve

L

e

ve

l,

d

B

A

-14 -12 -10 -8 -6 -4 -2 0 2 0 30 60 90 120 150 180 210 240 270 300 330 -14 -12 -10 -8 -6 -4 -2 0 2