1. Lab No.05
Signal Operations applied
to an audio signal
Designed by : Dawar Awan
dawar@cecos.edu.pk
CECOS College of Engineering and IT
March – July 2012
2. Audio in MATLAB
Reading a Saved wav file
>> variablename=waveread(‘filename’)
Reading a 2sec chunk of mic’s sound into MATLAB
Playing back a wav file
CECOS College of Engineering and IT
March – July 2012
6. Signal operations
Adding an extra tone to the audio signal
CECOS College of Engineering and IT
March – July 2012
7. Signal operations
Down sampling the audio signal by a factor of 3
CECOS College of Engineering and IT
March – July 2012
8. Signal Operations
Changing the samples per second send to sound card
CECOS College of Engineering and IT
March – July 2012
9. Task
1. Write a MATLAB code that adds echo to an audio signal.
hint: An echo effect can be created by adding the original signal to its
delayed version.
CECOS College of Engineering and IT
March – July 2012