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20
DCA ATTACK TIME
Determines how long it takes
for the DCA output voltage
to rise from zero to its
maximum level.
Essentially, attack determines
the "quickness" at which a
sound reaches its maximl.lm
volume' after a not~ is played
on the keyboard.
21
DCA DECAY TIME
Determines the period that it
takes for the DCA envelope
to fall from the maximum
contour level to the sustain
level.
:22
DCA SUSTAIN LEVEL
1
Determines the voltage level
to which the DCA envelope
1
· 1 ?ecays, assuming that 'the
~ ey is still being held down
,on the keyboard.
, ,1, , ,
_,,,,,,,,.,~
I
' l 2 3
DCA RELEASE TIME
E>et~rmines-the peri0d that-it
takes for the DCA envelope ·
to fall away from the sustain
level to its minimum level
after the key has been
released.
24
ATTACK CURVE
1
, ,
Determines the Gurve of the
DCA envelope attack over
time. ,-
-
A value of "O" provides a
quick attack as the curv, e is
rather-acute, while a ' setting
of' ,),,,
provides a sloping
curve for a slower attack
which is useful in creating
brass sounds, etc.
0 -
- -
31
')Ill\.h
I
l
-31-
Sound Synthesis Techniques
Volume
Volume . ,
I
tli>ecay }ime
i---:-1
Time
Volume
,r
,,1
Sustain
/eve/
Volume
, 'l'l
if,.
I '
Volume I ,
l~
I
, , Data
=P
Time
Key OFF
Oatil , = • t
Time
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