Distortion techniques

Digital Signal Processinghakon.kvidal@nmh.no

Clipping

Sinuskurve

Klipping

TerskelThresold

Mirror (Speiling)

Sinuskurve

Speiling- Mirror

TerskelThresold

Wrap (Bretting)

Sinuskurve

Bretting - Wrap

TerskelThresold

tanh()-funksjonen

• Signalet multipliseres med en hyperbolsk tangent

A linear transfer function

(signal unmodified)

tanh(x*2) transfer function

tanh(x*4) transfer function

tanh()-funksjonen

Sinuskurve

Sine with tanh distortion, gain = 1

Sine with tanh distortion, gain = 3

Sine with tanh distortion, gain = 7

Waveshaping

Waveshaping – Lytte eks 1

Vi behandler en sinusbølge følgende funksjon

Example transfer function for waveshaping, rising sigmoid.

Sine waveshaped with rising sigmoid shaped

transfer function

Waveshaping – Lytte eks 2

Vi behandler en sinusbølge følgende funksjon

Example transfer function for waveshaping, rising sigmoid plus 4th harmonic sine component.

Sine waveshaped with sigmoid and 4th

harmonic sine transfer function

Waveshaping – Lytte eks 3

Vi behandler en sinusbølge følgende funksjon

Example transfer function for waveshaping, arbitrary linear

segments.

Sine waveshaped with arbitrary linear segment

transfer function