Doepfer A-137 Manual

Doepfer Ikke kategoriseret A-137

Læs gratis den danske manual til Doepfer A-137 (6 sider) i kategorien Ikke kategoriseret. Denne vejledning er vurderet som hjælpsom af 23 personer og har en gennemsnitlig bedømmelse på 4.9 stjerner ud af 12 anmeldelser. Har du et spørgsmål om Doepfer A-137, eller vil du spørge andre brugere om produktet?

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Side 1/6

doepfer System A - 100 Waveform Multiplier A-137

1. Introduction Module A-137 is a Voltage Controlled Waveform Mul-

tiplier. The basic idea of a wave multiplier is to multiply

the waveform of an incoming signal (e.g. triangle from

a VCO) within one period. This leads to additional

harmonics. The period and consequently the pitch of

the signals remains unchanged - in contrast to fre-

quency multiplication e.g. with the PLL module A-196.

The A-137 works as a kind of "inverse low pass filter",

i.e. it adds a lot of harmonics to the incoming signal.

Consequently the best results are obtained with signals

that contain none or only a few harmonics (e.g. triangle

or sine waveforms). The A-137 can be used with signals

rich in harmonics too (e.g. saw) but the effect is not as

remarkable as for triangle or sine waves.

The A-137 is a very sophisticated wave multiplier that

offers much more features, more controls and more

waveform manipulations than other wave multipliers

available so far. In addition all four parameters are both

manually adjusted and controlled by external volta-

ges:

• Multiples: number of waveform multiplications

• Harmonics: adds more harmonics similar to the re-

sonance/emphasis control of filters

• Folding Level/Symmetry: value and symmetry of

the upper/lower folding level

A-137 Waveform Multiplier System A - 100 doepfer

2. Basic principles

The signal is processed by a standard linear VCA and 4

so-called wave folding stages. The amplification of the

VCA is identical with the Multiples parameter. This is the

working principle of the folding stages: As soon as the

signal goes beyond the upper resp. below the lower

folding level the signal is reflected resp. folded back. The

values for upper and lower folding level are derived from

the input parameters folding level and symmetry. Both

can be adjusted manually and controlled by an external

control voltage (CV). Folding Level determines the di-

stance between the upper and lower folding level, Fol-

ding Symmetry the position of both levels relating to the

zero line. The internal upper and lower folding level are

calculated by adding resp. subtracting the voltages for

Folding Level and Folding Symmetry (refer to fig. 3).

The working principle of one stage by means of a

triangle signal is shown in fig. 1. The upper picture

shows the incoming signal. The areas to be reflected are

filled black. The lower picture shows the output signal of

the stage. In this example the symmetry is slightly posi-

tive and the reflected areas are not symmetrical.

Fig. 2 shows the folding function of three stages. The

amplification (i.e. the Multiples parameter) is increased

for the succeeding pictures to see the effect of incre-

asing Multiples. Stage 4 is not shown because of clear-

ness.

Fig 1: Folding function for one stage

Fig 2: Folding function for three stages

Produkt Specifikationer

Mærke:	Doepfer
Kategori:	Ikke kategoriseret
Model:	A-137

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