Doepfer A-191 Shepard Generator/16xMIDI-CV Interface (no l Manual de usuario descargar pdf (Pagina 12)

A-191

MCV 16

System A - 100

doepfer

5. Shepard generator

5.1 Basics

A Shepard generator is a modulation oscillator,

which produces various phase inversions of triangle

and sawtooth waveforms at its outputs.

The way the Shepard generator is set up produces

various psycho-acoustic phenomena, such as the

‘barber-pole’ effect - seemingly never-ending upward

or downward spirals of pitch, filter settings, phasing,

and stereo or quadraphonic sound-stage panning (see

chapter 5.3, User examples).

The triangle wave signal is sent via outputs T 0 to T

315, and the sawtooth wave signal is sent via out-

puts

S 0

S 315

, (where the numbers refer to the

phase displacement for each output in degrees).

Fig. 5 shows this, but with only every other output

included, for the sake of clarity. T

LFO

is the time the

internal LFOs take to complete one cycle.

The Shepard mode - the direction of the sawtooth

waveform generated - is

selectable

. Fig. 5 shows the

mode with a sawtooth waveform.

Fig. 5: Shepard generator output signals (half shown)

S 0

S 90

S 180

S 270

T 0

T 90

T 180

T 270

LFO

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 18

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Doepfer A-191 Shepard Generator/16xMIDI-CV Interface (no l Manual de usuario Pagina 12