<s>
Direct	B-General_Concept
voice	I-General_Concept
input	I-General_Concept
(	O
DVI	O
)	O
,	O
sometimes	O
called	O
voice	O
input	O
control	O
(	O
VIC	O
)	O
,	O
is	O
a	O
style	O
of	O
human	B-Application
–	I-Application
machine	I-Application
interaction	I-Application
"	O
HMI	O
"	O
in	O
which	O
the	O
user	O
makes	O
voice	B-Application
commands	I-Application
to	I-Application
issue	I-Application
instructions	I-Application
to	I-Application
the	I-Application
machine	I-Application
through	O
speech	B-Application
recognition	I-Application
.	O
</s>
<s>
In	O
the	O
field	O
of	O
military	O
aviation	O
,	O
DVI	O
has	O
been	O
introduced	O
into	O
the	O
cockpits	O
of	O
several	O
modern	O
military	O
aircraft	O
,	O
such	O
as	O
the	O
Eurofighter	B-Application
Typhoon	I-Application
,	O
the	O
Lockheed	O
Martin	O
F-35	O
Lightning	O
II	O
,	O
the	O
Dassault	O
Rafale	O
,	O
the	O
KF-21	O
Boramae	O
and	O
the	O
Saab	O
JAS	O
39	O
Gripen	O
.	O
</s>
<s>
Such	O
systems	O
have	O
been	O
also	O
been	O
used	O
for	O
various	O
other	O
purposes	O
,	O
including	O
industry	O
control	O
systems	O
and	O
speech	B-Application
recognition	I-Application
assistance	O
for	O
impaired	O
individuals	O
.	O
</s>
<s>
Users	O
of	O
a	O
discrete	O
recognition	O
system	O
must	O
pause	O
between	O
each	O
word	O
so	O
that	O
the	O
DVI	O
system	O
can	O
identify	O
the	O
separations	O
between	O
each	O
word	O
,	O
while	O
a	O
continuous	O
speech	B-Application
recognition	I-Application
system	O
is	O
capable	O
of	O
understanding	O
a	O
normal	O
rate	O
of	O
speech	O
.	O
</s>
<s>
Recommendations	O
for	O
improvements	O
included	O
the	O
adoption	O
of	O
simpler	O
syntax	B-Application
,	O
the	O
achievement	O
of	O
a	O
greater	O
recognition	O
rate	O
,	O
and	O
a	O
decrease	O
in	O
response	O
times	O
;	O
all	O
of	O
the	O
issues	O
encountered	O
were	O
determined	O
to	O
be	O
of	O
a	O
technological	O
nature	O
,	O
and	O
were	O
deemed	O
feasible	O
to	O
resolve	O
.	O
</s>
<s>
In	O
another	O
case	O
,	O
an	O
General	O
Dynamics	O
F-16	O
Fighting	O
Falcon	O
simulator	O
was	O
modified	O
with	O
DVI	O
for	O
a	O
voice	B-Application
control	I-Application
study	O
that	O
was	O
undertaken	O
by	O
the	O
Royal	O
Netherlands	O
Air	O
Force	O
.	O
</s>
<s>
DVI	O
trials	O
have	O
also	O
been	O
conducted	O
on	O
helicopters	B-Application
,	O
including	O
the	O
Boeing	O
AH-64	O
Apache	O
,	O
showing	O
the	O
potential	O
to	O
improve	O
flight	O
safety	O
and	O
mission	O
effectiveness	O
.	O
</s>
<s>
Numerous	O
modern	O
fighter	O
aircraft	O
have	O
been	O
outfitted	O
with	O
DVI	O
systems	O
,	O
often	O
in	O
combination	O
with	O
various	O
other	O
man-machine	B-Application
interface	I-Application
schemes	O
,	O
such	O
as	O
HOTAS-compliant	O
controls	O
and	O
other	O
advanced	O
control	O
technologies	O
.	O
</s>
<s>
The	O
combination	O
of	O
Voice	O
and	O
HOTAS	B-Algorithm
control	O
schemes	O
has	O
sometimes	O
been	O
referred	O
to	O
as	O
the	O
"	O
V-TAS	O
"	O
concept	O
.	O
</s>
<s>
A	O
prominent	O
fighter	O
aircraft	O
to	O
be	O
furnished	O
with	O
a	O
V-TAS	O
cockpit	O
is	O
the	O
Eurofighter	B-Application
Typhoon	I-Application
.	O
</s>
<s>
By	O
1990	O
,	O
working	O
prototypes	O
of	O
speech	B-Application
recognition	I-Application
systems	O
were	O
being	O
demonstrated	O
;	O
these	O
were	O
being	O
promoted	O
for	O
the	O
purpose	O
of	O
providing	O
an	O
effective	O
man-machine	B-Application
interface	I-Application
for	O
individuals	O
with	O
impaired	O
speech	O
.	O
</s>
<s>
Techniques	O
employed	O
included	O
time-encoded	O
digital	O
speech	O
and	O
automatic	O
token	B-Application
set	O
selection	O
.	O
</s>
<s>
During	O
the	O
2010s	O
,	O
various	O
companies	O
were	O
offering	O
voice	O
recognition	O
systems	O
to	O
the	O
general	O
public	O
in	O
the	O
form	O
of	O
personal	B-Application
digital	I-Application
assistants	I-Application
.	O
</s>
<s>
One	O
example	O
is	O
the	O
Google	B-Application
Voice	I-Application
service	O
,	O
which	O
allows	O
users	O
to	O
pose	O
questions	O
via	O
a	O
DVI	O
package	O
installed	O
on	O
either	O
a	O
personal	B-Device
computer	I-Device
,	O
tablet	B-Device
,	O
or	O
mobile	O
phone	O
.	O
</s>
<s>
Numerous	O
digital	O
assistants	O
have	O
been	O
developed	O
,	O
such	O
as	O
Amazon	B-Device
Echo	I-Device
,	O
Siri	B-Application
,	O
and	O
Cortana	B-Application
,	O
that	O
use	O
DVI	O
to	O
interact	O
with	O
users	O
.	O
</s>
