Roland MC-202 User Manual

< Pulse Wave>
When
the
top
and bottom
portions
of the
square
wave are
unequal,
the result
is what
is called
a
pulse wave.
The
harmonic
content
of
the pulse
wave will
depend greatly
on the
width of
the
pulses.
It
is
possible
to
modulate,
or change
the
pulse width
by means
of the
LFO
or the En-
velope
Generator.
<Waveforms>
There
are
2 types
of waveforms from
the VCO
(
niJand
/I
)
which are
sent to
the SOURCE
MIXER
and
mixed
at any portion
you
like.
<Other
Sound
Sources>
•
SUB Oscillator
This is
the VCO's
subordinate Oscillator
which
generates the
output
signal one
octave or
two
lower than
the
VCO's. The
output waveform
of
this Oscillator
is Pulse
Wave.
Waveform
Waveform
Description
Harmonic
Content
V
Sawtooth
The
sawtooth wave
con-
tains
a
fundamental
sine
wave
and its integral har-
monic
sine waves
at a
fixed
ratio. The level
of each har-
monic is as shown
on the
right. When fundamental
content is
1
, the content of
nth
harmonic
is 1/n.
F2345678
Square
The square wave
contains
a fundamental sine wave
and
its
odd numbered har-
monics at
a
fixed
ratio. The
level of each
harmonic is
the same as sawtooth
wave: the
content of mh
harmonic is 1/n;
except
that there are
no even num-
bered harmonics.
JZL
F
3
5 7
Pulse
With
pulse
wave, the har-
monic
content
greatly var-
ies
depending
on the pulse
width.
It is characterized
by
a
lack
of the nth
harmonic
series
when the
pulse
width
is 1/n. The
example
on the left lacks
3rd,
6th,
and 9th harmonics
because
the
pulse width is
1/3
(33%).
PULSE
WIDTH
at
33% (1/3)
n-n
F
2
4
5 7
8

Roland MC-202 Specifications

General

Brand	Roland
Model	MC-202
Category	Synthesizer
Language	English