Waldorf Blofeld User Manual download pdf (Page 92)

Sound Synthesis Basics

Blofeld User´s Manual 92

tube that can contain a certain amount of air. The player

blows air through the tube in a way such that the air starts

to vibrate. This vibration is almost completely

symmetrical, 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 real time. This is done by

changing the width of the upper and lower portion of the

waveform cycle. These portions are called pulses, hence

the name pulse width. The width of the first pulse is used

to distinguish between different pulse waves and it is

measured in percent. The following picture shows 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

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Waldorf Blofeld User Manual Page 92