Roland S-10 - Page 8

S-10
DEC.
1986
3-1.
Loading
From
QD
(See
Fig.
3)
3-2.
Sampling
External Audio
Input
IC3b of the
output
board
can accommodate
input
signals between -50dBm
and OdBm. The
compres-
sor consisting of
IC3a,
4, 5,
Q7,
etc. relieves the
sub-
sequent digital circuits from overload.
3-1.
K
(Fig.
3#,®)
3-2.
T7
\-y°
y
h
rH
-
KCO
I
C3bCOfFSA7Hi
-5
0
~
OdBm
T'To
i:X®:K>IC3a.
4,
5,
Q
7 (i
3
>
A
U-
-rf-p
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>
T
> rK-
V ±V
y
y°
>)
y
A4'
a
-.y
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^tzl±L2(Dtht]iim(in^-to
3-3.
Reproducing
Sampled
Sound
(See
Fig.
5)
The
sound data
that the
IC10 reads from DRAMs
is
in
a 12 bit format.
The
1C10
processes
this data
with
an ENVELOPE
data to give a
specific contour
to
the
sound.
The resulting
is
represented
by
an
expanded
16
bit data and then applied
to
the DAC
IC9. The
DAC
is configured
to
deliver each voice on
every
8th low
INH. The all
DAC outputs
are to be
fed
to
one
S/H circuit.
The
photo below shows
where
only one
sound
is being reproduced.
3-3.
+f>7”fh
Kx-^?<73H±(Fig.5#BS)
RF5C3 6(4DRAM*^F.i%Adibf;12
bit data
ENVELOPE A-
4'L.
Ihbit
Ur
UAC
-vdiALt-To
DACcDdfAliD-
I
NH
C0
4'
T
^
>
A'Pfi'Tt)
n,
8 T'T
^f-
:/
7°
IJ
>
A
/
T.
-
K
§ n
Tff § S
-To
T
co'Jf
Mii
T'd
X
tb
jjii
1
ofcif
coJi-^^ftLS-To