Appendix
212
Quantum Manual
blows air through the tube in such a way that the air starts
to vibrate. This vibration is almost completely symmetri-
cal, resulting in a hollow timbre.
The Pulse Wave
The Pulse wave is the most versatile wave in a classic
synthesizer because its shape and therefore its harmonic
content can be changed in realtime. This is done by chan-
ging the width of the upper and lower portion of the wave-
form cycle. These portions are called pulses – hence the
pulse width name. The width of the first pulse is used to
distinguish between different pulse waves and it is mea-
sured in percent. The following image illustrates several
pulse waves with different pulse widths:
Additive components of Pulse wave with different pulse
widths
The first thing you probably observe is that the lower part
of the wave has a narrower excursion. This is because the
energy of the wider pulse is higher than the one of the
narrower pulse. If this were not compensated, the overall
signal would have an unwanted DC offset.
As you have read in the previous chapter the harmonic
content of a 50% pulse wave is a special case. It has a very
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