(Digitally Controlled Oscillator)
II. Functions for Sound Creating: DCO
DCO is the digitally controlled oscillator that controls the pitch and creates three types of waveforms which are the sound source of the synthesizer. Compared to VCO (Voltage Controlled Oscillator), DCO has superior stability. The operations and functions of the DCO are virtually the same as those of the VCO. A DCO does not, however, provide a portamento function, because of its digitally controlled system.
(1) WAVEFORMS
You can select the output waveform of the DCO. Each switch can be individually turned on and off and can be used with other switches.
(2) PWM Mode switch
When it is set to MAN, pulse width can be fixed. When it is set to LFO or ENV, pulse width is controlled by the corresponding signal from the LFO or the Envelope Generator (EG).
(3) PWM · Pulse Width Modulation knob
When the PMW mode switch (2) is set to MAN, this knob controls the pulse width, and controls the intesity of of the modulation when it is set to LFO or ENV.
(4) SUB OSC · Sub Oscillator Level knob
It controls the volume of the SUB OSC.
(5) LFO · LFO Modulation knob
It adjusts the depth of vibrato effect when the LFO is controlling the pitch of the DCO.
(6) NOISE · NOISE level knob
It controls the volume of the NOISE.
<Pulse Wave>
When the top and bottom portions of the square wave are unequal, the result is what is commonly 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 envelope generator.
Waveforms:
[Pulse Width DIAGRAM]
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