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THE
JV'S
SOUND
UNITS
The
basic
sound
building
blocks
of
the
JV-880
are described
in
this
section.
Patches
TONES
The
sound programs used
in
playing the
instrument are
called
Patches.
A
single
Patch
is
itself
made
up
of
several
Tones.
-
Patch
Sound
Output
Tones
are the basic
sound
elements used
in
creating
Patches.
It
is
possible
to
create a Patch using only a
single
Tone; however, sounds
of
remarl<able
complexity
and
richness
can be
created
by
using
up
to
four
Tones
in
one
Patch.
The
structure of
a
Tone
is
shown
below.
WG
(Wave
Generator)
The
Wave
Generator
accesses a
waveform
stored
in
internal
memory,
on
optional
PCM
Cards
or
expansion
board,
to
be used
as the basic
sonic building block.
The
Wave
Generator
also controls the pitch
of
the
waveform
at
the
same
time.
As
the
waveform
is
the
basic
sound
unit,
it
is
largely
responsible
for
determining
the character of the
final
sound.
TVF
(Time
Variant
Filter)
This
filter
is
used
to
process
the
sound program by
cutting or
boosting
the
frequency elements of
the
original
waveform
produced by
the
Wave
Generator.
TVA
(Time
Variant
Amplifier)
This
filter
controls the
volume
of the sound.
ENV
(Envelope Generator)
The
envelope
generator
is
used
to
change
pitch,
frequency
or
volume
over
time,
when
used with
the
WG, TVF
or
TVA,
respectively.
LFO
(Low Frequency
Oscillator)
This
oscillator
applies a periodic or regular
change
to
the
pitch,
frequency
or
volume
when
used with
the
WG,
TVF
and
TVA,
respectively.
It
adds expression
to
the
sound by
creating various vibrato
effects.
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