<s>
FS-1016	B-Algorithm
(	O
also	O
called	O
FED-STD-1016	O
)	O
is	O
a	O
deprecated	O
secure	O
telephony	O
speech	B-Application
encoding	I-Application
standard	O
for	O
Code-excited	B-Algorithm
linear	I-Algorithm
prediction	I-Algorithm
(	O
CELP	B-Algorithm
)	O
developed	O
by	O
the	O
United	O
States	O
Department	O
of	O
Defense	O
and	O
finalized	O
February	O
14	O
,	O
1991	O
.	O
</s>
<s>
Unlike	O
the	O
vocoder	O
used	O
in	O
FS-1015	O
,	O
CELP	B-Algorithm
provides	O
more	O
natural	O
speech	O
.	O
</s>
<s>
However	O
,	O
due	O
to	O
quite	O
low	O
bit	O
rate	O
and	O
early	O
development	O
(	O
1991	O
)	O
,	O
the	O
speech	O
quality	O
is	O
very	O
noisy	O
and	O
below	O
that	O
of	O
commercial	O
cellular	O
speech	B-Application
codec	I-Application
such	O
as	O
AMR	B-Algorithm
.	O
</s>
<s>
FS-1016	B-Algorithm
is	O
no	O
longer	O
used	O
since	O
its	O
follow-up	O
MELP	B-Algorithm
provides	O
better	O
performance	O
in	O
all	O
applications	O
.	O
</s>
<s>
The	O
RAM	B-Architecture
requirement	O
is	O
1.5	O
kilobytes	O
.	O
</s>
<s>
The	O
variation	O
of	O
CELP	B-Algorithm
used	O
in	O
the	O
FS-1016	B-Algorithm
is	O
so-called	O
ternary	O
codebook	O
,	O
meaning	O
that	O
all	O
excitation	O
amplitudes	O
are	O
either	O
+1	O
,	O
−1	O
or	O
0	O
.	O
</s>
