DEMO_BLOCKPROC_EFFECTS - Various vocoder effects using DGT

Usage

demo_blockproc_effects('gspi.wav')

Description

For additional help call demo_blockproc_effects without arguments. This demo works correctly only with the sampling rate equal to 44100 Hz.

This script demonstrates several real-time vocoder effects. Namely:

1. Robotization effect: Achieved by doing DGT reconstruction using absolute values of coefficients only.
2. Whisperization effect: Achieved by randomizing phase of DGT coefficients.
3. Pitch shifting effect: Achieved by stretching/compressing coefficients along frequency axis.
4. Audio morphing: Input is morphed with a background sound such that the phase of DGT coefficients is substituted by phase of DGT coefficients of the background signal. File beat.wav (at 44,1kHz) (any sound will do) is expected to be in the search path, oherwise the effect will be disabled.

This demo was created for the Lange Nacht der Forschung 4.4.2014 event.