<s>
The	O
AT&T	B-General_Concept
DSP1	I-General_Concept
was	O
a	O
pioneering	O
digital	B-Architecture
signal	I-Architecture
processor	I-Architecture
(	O
DSP	O
)	O
created	O
by	O
Bell	O
Labs	O
.	O
</s>
<s>
The	O
DSP1	O
started	O
in	O
1977	O
with	O
a	O
Bell	O
Labs	O
study	O
that	O
recommended	O
creating	O
a	O
large-scale	O
integrated	O
circuit	O
for	O
digital	B-General_Concept
signal	I-General_Concept
processing	I-General_Concept
.	O
</s>
<s>
This	O
first	O
implementation	O
was	O
a	O
single-chip	O
DSP	O
,	O
containing	O
all	O
functional	O
elements	O
found	O
in	O
today	O
's	O
DSPs	O
including	O
multiplier	B-Algorithm
–	I-Algorithm
accumulator	I-Algorithm
(	O
MAC	O
)	O
,	O
parallel	O
addressing	O
unit	O
,	O
control	O
,	O
control	O
memory	O
,	O
data	O
memory	O
,	O
and	O
I/O	O
.	O
</s>
<s>
By	O
October	O
1979	O
other	O
Bell	O
Labs	O
groups	O
began	O
development	O
using	O
the	O
DSP1	O
,	O
most	O
notably	O
as	O
a	O
key	O
component	O
in	O
T	O
's	O
5ESS	B-Device
switch	I-Device
.	O
</s>
