Casio HT-6000 Operation Manual page 30

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