Waldorf Blofeld Manuel d'utilisateur télécharger pdf (Page 91)

Sound Synthesis Basics

91 Blofeld User´s Manual

bow pulling the string slightly into one direction. At one

point, the string abruptly comes off the bow and swings

back to its original position. The bow is still moved and so

it catches the string again and the procedure is repeated.

The result is a waveform that looks like a sawtooth. The

same is true for a brass instrument. The string in this case

are the lips while the bow is the air. The lips are moved

by the air to a certain extent and abruptly move back to

their original position.

The Square Wave

The Square Wave is a special waveform generated by a

pulse waveform with 50% pulse width. This means that

the positive part of the waveform has equal length to the

negative part. The pulse waveform can have other pulse

widths as you will read later. For now, we´ll talk about the

square wave as a unique waveform. The square wave

consists of all odd harmonics in which the magnitude of

each harmonic descends by the factor of its position. This

means that the first harmonic has full magnitude, the third

harmonic has a third magnitude, the fifth harmonic has a

fifth magnitude and so on. The following picture shows

how the individual harmonics build up the sawtooth

wave:

Additive components of the square wave with 50% pulse

width

The square wave was thought as an abstraction of wind

instruments like a panflute or a recorder. They consist of a

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Waldorf Blofeld Manuel d'utilisateur Page 91

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