AUDIO EXAMPLES

Inside the folder labelled AudioExamples you will find audio examples for four different test signals. These test signals have been chosen as they highlight the effects of aliasing and demonstrate the results obtained with the four discussed methods.

The name of each file describes its contents. There are 10 different type of files:

- Original signal
- Signal after trivial clipping
- Clipped signal with oversampling by 2
- Clipped signal with oversampling by 4
- Clipped signal after 2pt polyBLAMP correction
- Clipped signal after 4pt polyBLAMP correction
- Oversampling by 2 residual
- Oversampling by 4 residual
- 2pt polyBLAMP residual
- 4pt polyBLAMP residual

Description for each example:

EX1 - High-frequency sinusoid with slowly varying fundamental frequency
EX2 - High-frequency chirp
EX3 - Triangular oscillator ascending and descending in frequency at a high rate
EX4 - Guitar track

MATLAB CODE

MATLAB code for Figures 1, 2, 3, 7 and 10 has been included. Additionally, scripts to implement the 2-point and 4-point polyBLAMP methods on sinewaves have been provided.

Aalto University, Dept. of Signal Processing and Acoustics
Accompanying website for IEEE TSP Paper - Aliasing Reduction in Clipped Signals*
Fabian Esqueda, Stefan Bilbao and Vesa Valimaki, February 2016

* The published journal paper is available through the IEEExplore Digital Library: 
http://ieeexplore.ieee.org/document/7499828/