<s>
MBROLA	B-Application
is	O
speech	B-Application
synthesis	I-Application
software	O
as	O
a	O
worldwide	O
collaborative	O
project	O
.	O
</s>
<s>
The	O
MBROLA	B-Application
project	O
web	O
page	O
provides	O
diphone	O
databases	O
for	O
many	O
spoken	O
languages	O
.	O
</s>
<s>
The	O
MBROLA	B-Application
software	O
is	O
not	O
a	O
complete	O
speech	B-Application
synthesis	I-Application
system	O
for	O
all	O
those	O
languages	O
;	O
the	O
text	O
must	O
first	O
be	O
transformed	O
into	O
phoneme	B-Language
and	O
prosodic	O
information	O
in	O
MBROLA	B-Application
's	O
format	O
,	O
and	O
separate	O
software	O
(	O
e.g.	O
</s>
<s>
eSpeakNG	B-Language
)	O
is	O
necessary	O
.	O
</s>
<s>
MBROLA	B-Application
project	O
started	O
in	O
1995	O
at	O
TCTS	O
Lab	O
of	O
the	O
Faculté	O
polytechnique	O
de	O
Mons	O
(	O
Belgium	O
)	O
as	O
a	O
scientific	O
project	O
to	O
obtain	O
a	O
set	O
of	O
speech	B-Application
synthesizers	I-Application
for	O
as	O
many	O
languages	O
as	O
possible	O
.	O
</s>
<s>
First	O
release	O
of	O
MBROLA	B-Application
software	O
was	O
in	O
1996	O
and	O
was	O
provided	O
as	O
freeware	B-License
for	O
non-commercial	O
,	O
non-military	O
application	O
.	O
</s>
<s>
Due	O
to	O
its	O
free	O
usage	O
only	O
for	O
non-commercial	O
applications	O
,	O
MBROLA	B-Application
was	O
as	O
alternative	O
choice	O
for	O
private/home	O
users	O
for	O
de	O
facto	O
speech	B-Application
synthesis	I-Application
engine	O
eSpeakNG	B-Language
in	O
Linux	B-Application
workstations	O
,	O
but	O
mostly	O
was	O
not	O
used	O
for	O
commercial	O
solutions	O
(	O
e.g.	O
</s>
<s>
After	O
initial	O
development	O
of	O
voice	O
databases	O
updates	O
and	O
support	O
of	O
MBROLA	B-Application
software	O
ceased	O
and	O
gradually	O
closed-source	O
binaries	O
fell	O
behind	O
development	O
of	O
recent	O
hardware	O
and	O
operating	O
systems	O
.	O
</s>
<s>
To	O
deal	O
with	O
this	O
MBROLA	B-Application
development	O
team	O
decided	O
to	O
release	O
MBROLA	B-Application
as	O
open	B-Application
source	I-Application
software	I-Application
,	O
and	O
on	O
October	O
24	O
,	O
2018	O
,	O
source	O
code	O
was	O
released	O
on	O
GitHub	O
with	O
GNU	B-Application
Affero	I-Application
General	I-Application
Public	I-Application
License	I-Application
.	O
</s>
<s>
On	O
January	O
23	O
,	O
2019	O
,	O
tool	O
called	O
MBROLATOR	O
was	O
released	O
to	O
provide	O
creation	O
of	O
MBROLA	B-Application
database	O
from	O
WAV	O
files	O
with	O
the	O
same	O
license	O
.	O
</s>
<s>
MBROLA	B-Application
software	O
uses	O
MBROLA	B-Application
(	O
Multi-Band	O
Resynthesis	O
OverLap	O
Add	O
)	O
algorithm	O
for	O
speech	O
generation	O
.	O
</s>
<s>
Although	O
it	O
is	O
diphone-based	O
,	O
the	O
quality	O
of	O
MBROLA	B-Application
's	O
synthesis	O
is	O
considered	O
to	O
be	O
higher	O
than	O
that	O
of	O
most	O
diphone	O
synthesisers	O
as	O
it	O
preprocesses	O
the	O
diphones	O
imposing	O
constant	O
pitch	O
and	O
harmonic	O
phases	O
that	O
enhances	O
their	O
concatenation	O
while	O
only	O
slightly	O
degrading	O
their	O
segmental	O
quality	O
.	O
</s>
<s>
MBROLA	B-Application
is	O
a	O
time-domain	O
algorithm	O
similar	O
to	O
PSOLA	B-Application
,	O
which	O
implies	O
very	O
low	O
computational	O
load	O
at	O
synthesis	O
time	O
.	O
</s>
<s>
Unlike	O
PSOLA	B-Application
,	O
however	O
,	O
MBROLA	B-Application
does	O
not	O
require	O
a	O
preliminary	O
marking	O
of	O
pitch	O
periods	O
.	O
</s>
<s>
This	O
feature	O
has	O
made	O
it	O
possible	O
to	O
develop	O
the	O
MBROLA	B-Application
project	O
around	O
the	O
MBROLA	B-Application
algorithm	O
,	O
through	O
which	O
many	O
speech	O
research	O
labs	O
,	O
companies	O
,	O
or	O
individuals	O
around	O
the	O
world	O
have	O
provided	O
diphone	O
databases	O
for	O
many	O
languages	O
and	O
voices	O
.	O
</s>
