As scientists, it is important to sample as broadly as possible; however, there is a bias in the research performed on the speech acoustics of the world's languages toward work on languages of convenience (e.g., English). This special issue seeks to initiate increased publication of acoustic research on the sounds of the world's languages. The special issue contains a sample of 25 under-documented languages. While large relative to previous work (particularly in the Journal of the Acoustical Society of America), the 23 articles in this issue just scratch the surface. To have a better understanding of the fundamentals of speech communication, it is imperative, as a research community, to make a concerted effort to learn more about how speech sounds are perceived and produced in a wide variety of languages.

1.
Almurashi
,
W.
,
Al-Tamimi
,
J.
, and
Khattab
,
G.
(
2020
). “
Static and dynamic cues in vowel production in Hijazi Arabic
,”
J. Acoust. Soc. Am.
147
,
2917
2927
.
2.
Billington
,
R.
,
Fletcher
,
J.
,
Thieberger
,
N.
, and
Volchok
,
B.
(
2020
). “
Acoustic evidence for right-edge prominence in Nafsan
,”
J. Acoust. Soc. Am.
147
,
2829
2844
.
3.
Chiu
,
C.
, and
Sun
,
J. T.-S.
(
2020
). “
On pharyngealized vowels in Northern Horpa: An acoustic and ultrasound study
,”
J. Acoust. Soc. Am.
147
,
2928
2946
.
4.
Eberhard
,
D. M.
,
Simons
,
G. F.
, and
Fennig
,
C. D.
(
2020
). “
Ethnologue: Languages of the World. Twenty-third edition
,” SIL International, Dallas, Texas, https://www.ethnologue.com/.
5.
Egurtzegi
,
A.
, and
Carignan
,
C.
(
2020
). “
An acoustic description of Mixean Basque
,”
J. Acoust. Soc. Am.
147
,
2791
2802
.
6.
Elias-Ulloa
,
J.
, and
Tallman
,
A. J. R.
(
2020
). “
The acoustic correlates of stress and tone in Chácobo (Pano): A production study
,”
J. Acoust. Soc. Am.
147
,
3028
3042
.
7.
Hammarström
,
H.
,
Forkel
,
R.
, and
Haspelmath
,
M.
(
2019
). “
Glottolog database 4.1
,” Max Planck Institute for the Science of Human History, https://glottolog.org, jena (Last viewed Apr. 15, 2020).
8.
Hiovain
,
K.
,
Vainio
,
M. T.
, and
Šimko
,
J.
(
2020
). “
Dialectal variation of duration patterns in Finnmark North Sámi quantity
,”
J. Acoust. Soc. Am.
147
,
2817
2828
.
9.
Horo
,
L.
,
Priyankoo
,
S.
, and
Anderson
,
G. D. S.
(
2020
). “
Acoustic phonetic study of the Sora vowel system
,”
J. Acoust. Soc. Am.
147
,
3000
3011
.
10.
Howson
,
P. J.
, and
Kochetov
,
A.
(
2020
). “
Lowered F2 observed in uvular rhotics involves a tongue root gesture: Evidence from Upper Sorbian
,”
J. Acoust. Soc. Am.
147
,
2845
2857
.
11.
Hussain
,
Q.
, and
Mielke
,
J.
(
2020
). “
An acoustic and articulatory study of laryngeal and place contrasts of Kalasha (Indo-Aryan, Dardic)
,”
J. Acoust. Soc. Am.
147
,
2873
2890
.
12.
Kaland
,
C.
, and
Baumann
,
S.
(
2020
). “
Demarcating and highlighting in Papuan Malay phrase prosody
,”
J. Acoust. Soc. Am.
147
,
2974
2988
.
13.
Kelterer
,
A.
, and
Schuppler
,
B.
(
2020
). “
Phonation type and tone in Chichimec
,”
J. Acoust. Soc. Am.
147
,
3043
3059
.
14.
Kochetov
,
A.
,
Heegård Petersen
,
J.
, and
Arsenault
,
P.
(
2020
). “
Acoustics of Kalasha laterals
,”
J. Acoust. Soc. Am.
147
,
2873
2890
.
15.
Ladefoged
,
P.
, and
Maddieson
,
I.
(
1996
).
The Sounds of the World's Languages
(
Blackwell
,
Oxford, UK
).
16.
Liu
,
M.
,
Chen
,
Y.
, and
Schiller
,
N. O.
(
2020
). “
Tonal mapping of Xi–an Mandarin and standard Chinese
,”
J. Acoust. Soc. Am.
147
,
2803
2816
.
17.
Lotz
,
J.
(
1950
). “
Speech and language
,”
J. Acoust. Soc. Am.
22
(
6
),
712
717
.
18.
Mellesmoen
,
G. M.
, and
Babel
,
M.
(
2020
). “
Acoustically distinct and perceptually ambiguous: ʔayʔauθəm (Salish) fricatives
,”
J. Acoust. Soc. Am.
147
,
2959
2973
.
19.
Misnadin
, and
Kirby
,
J.
(
2020
). “
Acoustic correlates of plosive voicing in Madurese
,”
J. Acoust. Soc. Am.
147
,
2779
2790
.
20.
Nance
,
C.
, and
Kirkham
,
S.
(
2020
). “
The acoustics of three-way lateral and nasal palatalisation contrasts in Scottish Gaelic
,”
J. Acoust. Soc. Am.
147
,
2858
2872
.
21.
Rosen
,
N.
,
Stewart
,
J.
, and
Sammons
,
O.
(
2020
). “
How ‘mixed’ is mixed language phonology? An acoustic analysis of the Michif vowel system
,”
J. Acoust. Soc. Am.
147
,
2989
2999
.
22.
Sarvasy
,
H.
,
Elvin
,
J.
,
Li
,
W.
, and
Escudero
,
P.
(
2020
). “
An acoustic phonetic description of Nungon vowels
,”
J. Acoust. Soc. Am.
147
,
2891
2900
.
23.
Shi
,
M.
,
Chen
,
Y.
, and
Mous
,
M.
(
2020
). “
Tonal split and laryngeal contrast of onset consonant in Lili Wu Chinese
,”
J. Acoust. Soc. Am.
147
,
2901
2916
.
24.
Stewart
,
J.
,
Meakins
,
F.
,
Algy
,
C.
,
Ennever
,
T.
, and
Joshua
,
A.
(
2020
). “
Fickle fricatives: Fricative and stop perception in Gurindji, Gurindji Kriol, Roper Kriol, and standard Australian English
,”
J. Acoust. Soc. Am.
147
,
2766
2778
.
25.
Tabain
,
M.
,
Butcher
,
A.
, and
Beare
,
R.
(
2020
). “
A formant study of the alveolar versus retroflex contrast in three Central Australian languages: Stop, nasal and lateral manners of articulation
,”
J. Acoust. Soc. Am.
147
,
2745
2765
.
26.
Torres
,
C.
, and
Fletcher
,
J.
(
2020
). “
The alignment of F0 tonal targets under changes in speech rate in Drehu
,”
J. Acoust. Soc. Am.
147
,
2947
2958
.
27.
UCLA Phonetics Lab Archive
(
2007
). http://archive.phonetics.ucla.edu/, UCLA Department of Linguistics, Los Angeles, CA (Last viewed Apr. 15, 2020).
28.
Whalen
,
D. H.
,
DiCanio
,
C.
, and
Shaw
,
P. A.
(
2011
). “
Phonetics of endangered languages
,”
Acoust. Today
7
(
4
),
35
42
.
29.
Whalen
,
D. H.
,
DiCanio
,
C. T.
, and
Dockum
,
R.
(2020). “
Phonetic documentation in three collections: Topics and evolution
,”
J. Int. Phon. Assoc.
(in press).
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