13.4
Waveforms
Oscillators and LFOs generate periodic, varying output voltages. If one plots these output
voltages into a graph, one sees the resulting oscillation forms. In subtractive synthesizers,
the following modes of vibration play a special role:
The sine waveform is a fundamental without overtones. Sine waves do not change their
sound during filtering. They can only get quieter by filtering. If you need a dull, unobtrusive
boost in the bass range, you're in the right place. Due to the lack of overtones, this
waveform is very suitable for FM sounds.
If you want to add a few restrained overtones to the sine wave, you should work with the
saturation in the mixer or change the Time Linearity Modulation value. After that, of course,
you no longer have a sine wave.
The triangle wave has a few overtones, but it still sounds very soft. You can use triangle
waves well for soft melody sounds.
The sawtooth waveform has the brightest spectrum with all even and uneven overtones.
Therefore, in subtractive synthesis, it offers the most interesting spectra for processing in
filters.
The square waveform has an unbalanced, slightly aggressive sound character, because it
contains only the odd overtones. If you need the Emerson, Lake and Palmer 'Lucky MAN'
sound, just pick up several Oscillator Clones, set them to Rectangle and detune the
Oscillator Clones. open the filter, set a high sustain level in the envelope, activate Glide and
add some reverb - it instantly sounds like Keith Emerson.
With the help of TLM modulation, you can use the square wave to form a pulse wave. This
reduces the belly sounding lower midrange overtones.
13.5
TLM Modulation (Time Linearity Modulation)
Almost every synthesizer player has heard of the pulse width of a square wave. If you
change the clock ratio at a square wave, you will get a so called Pulsewave. By modulating
the clock-ratio, you get a so-called pulse width modulation (PWM). During the design of the
Spectralis synthesizer, we developed a new form of modulation that acts like a PWM on
square waves, but can also be applied to other waveforms. We called this modulation TLM
modulation, where TLM stands for Time Linearity Modulation. You bump the time of the first
half-wave and stretch the time of the second half-wave. Using the square wave and the
sine wave, the graphic shows how the TLM affects different modes of oscillation.
In the middle you see the TLM value 0, to the right and left of it positive and negative
values.
von
60
63
SINE
TRIANGLE
Sawtooth
Rectangle
Summary of Contents for DELTA CEP A
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