How accurately can sound pressure levels (SPLs) of speech be estimated from skin vibration of the neck? Measurements using a small accelerometer were carried out in 27 subjects (10 males and 17 females) who read Rainbow and Marvin Williams passages in soft, comfortable, and loud voice, while skin acceleration levels (SALs) and SPLs were simultaneously registered and analyzed every 30 ms. The results indicate that the mean SPL of voiced speech can be estimated with accuracy better than ±2.8 dB in 95% of the cases when the subjects are individually calibrated. This makes the accelerometer an interesting sensor for SPL measurement of speech when microphones are problematic to use (e.g., noisy environments or in voice dosimetry). The estimates of equivalent SPL, which is the logarithm of averaged relative energy of voiced speech, were found to be up to 1.5 dB less accurate than the mean SPL. The estimation accuracy for instantaneous SPLs was worse than for the mean and equivalent SPLs (on average ±6 and ±5 dB for males and females, respectively).

1.
Adams, T. M. (2002). A2LA guide for the Estimation of Measurement Uncertainty in Testing (The American Association for Laboratory Accreditation, Frederick, MD). Available online from http://www.a2la2.net/guidance/est_mu_testing.pdf
2.
ANSI (1994). S1.1-1994. “Americal National Standard: Acoustical Terminology” (American National Standards Institute, New York).
3.
Bastian
,
R. W.
,
Keidar
,
A.
, and
Verdolini-Marston
,
K.
(
1990
). “
Simple vocal tasks for detecting vocal fold swelling
,”
J. Voice
4
(
2
),
172
183
.
4.
Cheyne, H. A. (2002). “Estimating glottal voicing source characteristics by measuring and modeling the acceleration of the skin on the neck,” Doctoral dissertation. Massachusetts Institute of Technology.
5.
Cheyne
,
H. A.
,
Hanson
,
H. M.
,
Genereux
,
R. P.
,
Stevens
,
K. N.
, and
Hillman
,
R. E.
(
2003
). “
Development and testing of a portable vocal accumulator
,”
J. Speech Lang. Hear. Res.
46
,
1457
1467
.
6.
Coleman
,
R. F.
(
1988
). “
Comparison of microphone and neck-mounted accelerometer monitoring of the performing voice
,”
J. Voice
2
(
3
),
200
205
.
7.
Fairbanks, G. (1960). Voice and Articulation Drill Book (Harper and Row, New York).
8.
Hess, W. (1983). Pitch Determination of Speech Signals: Algorithms and Devices (Springer, Berlin-Heidelberg-New York-Tokyo).
9.
Hillman, R., and Cheyne, H. (2003a). “A portable vocal accumulator with biofeedback capability,” in AQL 2003 Hamburg: Proceeding Papers for the Conference Advances in Quantitative Laryngology, Voice and Speech Research, edited by G. Schade, F. Müller, T. Wittenberg, and M. Hess (IRB, Stuttgart, Germany), available online from http://www.uke.uni-hamburg.de/AQL2003
10.
Hillman
,
R.
, and
Cheyne
,
H.
(
2003b
). “
Development of a portable voice monitor with biofeedback capability
,”
Perspect. Voice Voice Disord.
13
,
23
25
.
11.
Horii
,
Y.
(
1982
). “
Jitter and shimmer differences among sustained vowel phonations
,”
J. Speech Hear. Res.
25
(
1
),
12
14
.
12.
Horii
,
Y.
(
1983
). “
An accelerometric measure as a physical correlate of perceived hypernasality in speech
,”
J. Speech Hear. Res.
26
(
3
),
476
480
.
13.
ISO (1996). 9921-1:1996(E) international standard. Ergonomic assessment of speech communication. Part 1: Speech interference level and communication distances for persons with normal hearing capacity in direct communication (SIL method). (International Organization for Standardization, Geneva), pp. 1–10.
14.
Lippmann
,
R. P.
(
1981
). “
Detecting nasalization using a low-cost miniature accelerometer
,”
J. Speech Hear. Res.
24
,
314
317
.
15.
Pešák
,
J.
(
1990
). “
Differentiated laryngeal phonation
,”
Folia Phoniatr.
42
,
296
301
.
16.
Popolo, P. S., Švec, J. G., Hunter, E. J., Rogge-Miller, K., Nix, J., and Titze, I. R. (2004). “Teacher’s Guide to Voice Dosimetry,” NCVS Online Technical Memo, No. 4, 1-32. Available online from http://www.ncvs.org
17.
Sakakura, A., and Takahashi, H. (1988). “Body wall vibration in trained and untrained voices,” in Vocal Physiology: Voice Production, Mechanisms, and Functions, edited by O. Fujimura (Raven, New York), pp. 391–401.
18.
Sala
,
E.
,
Airo
,
E.
,
Olkinuora
,
P.
,
Simberg
,
S.
,
Ström
,
U.
,
Laine
,
A.
,
Pentti
,
J.
, and
Suonpää
,
J.
(
2002
). “
Vocal loading among day care center teachers
,”
Logoped. Phoniatr. Vocol.
27
(
1
),
21
28
.
19.
Sataloff, R. T. (ed.) (1997). Professional Voice: The Science and Art of Clinical Care, 2nd ed. (Singular, San Diego).
20.
Schutte, H. K. (2000). “The phonetogram: measurement and interpretation,” in Diseases of the Larynx, edited by A. Ferlito (Arnold/Oxford University Press, London, Great Britain/New York, NY), pp. 145–149.
21.
Schutte
,
H. K.
, and
Seidner
,
W.
(
1983
). “
Recommendation by the Union of European Phoniatricians (UEP): Standardizing voice area measurement/phonetography
,”
Folia Phoniatr.
35
,
286
288
.
22.
Stevens
,
K.
,
Kalikow
,
D.
, and
Willemain
,
T.
(
1975
). “
A miniature accelerometer for detecting glottal waveforms and nasalization
,”
J. Speech Hear. Res.
18
,
594
599
.
23.
Sundberg
,
J.
(
1983
). “
Chest wall vibrations in singers
,”
J. Speech Hear. Res.
26
,
329
340
.
24.
Sundberg
,
J.
(
1992
). “
Phonatory vibration in singers: A critical review
,”
Music Percept.
9
,
361
382
.
25.
Švec
,
J. G.
,
Popolo
,
P. S.
, and
Titze
,
I. R.
(
2003a
). “
Measurement of vocal doses in speech: Experimental procedure and signal processing
,”
Logoped. Phoniatr. Vocol.
28
,
181
192
.
26.
Švec, J. G., Titze, I. R., and Popolo, P. S. (2003b). “Vocal dosimetry: Theoretical and practical issues,” in AQL 2003 Hamburg: Proceeding Papers for the Conference Advances in Quantitative Laryngology, Voice and Speech Research, edited by G. Schade, F. Müller, T. Wittenberg, and M. Hess (IRB, Stuttgart, Germany), available online from http://www.uke.uni-hamburg.de/AQL2003
27.
Švec, J. G., Hunter, E. J., Popolo, P. S., Rogge-Miller, K., and Titze, I. R. (2004). “The calibration and setup of the NCVS dosimeter,” NCVS Online Technical Memo, No. 2, April 2004, 1–52. Available online from http://www.ncvs.org/ncvs/library/tech
28.
Titze
,
I. R.
,
Švec
,
J. G.
, and
Popolo
,
P. S.
(
2003
). “
Vocal dose measures: Quantifying accumulated vibration exposure in vocal fold tissues
,”
J. Speech Lang. Hear. Res.
46
(
4
),
922
935
.
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