Lab No.05

Signal Operations applied
to an audio signal

Designed by : Dawar Awan
dawar@cecos.edu.pk
CECOS College of Engi...
Audio in MATLAB
 Reading a Saved wav file
>> variablename=waveread(‘filename’)
 Reading a 2sec chunk of mic’s sound into...
Signal Operations
 Delay of 10000 samples

CECOS College of Engineering and IT

March – July 2012
Signal operations
 Time reversed signal

CECOS College of Engineering and IT

March – July 2012
Signal operations
 Amplitude scaling

CECOS College of Engineering and IT

March – July 2012
Signal operations
 Adding an extra tone to the audio signal

CECOS College of Engineering and IT

March – July 2012
Signal operations
 Down sampling the audio signal by a factor of 3

CECOS College of Engineering and IT

March – July 201...
Signal Operations
 Changing the samples per second send to sound card

CECOS College of Engineering and IT

March – July ...
Task
1. Write a MATLAB code that adds echo to an audio signal.
hint: An echo effect can be created by adding the original ...
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Lab no.06

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Lab no.06

  1. 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. 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
  3. 3. Signal Operations  Delay of 10000 samples CECOS College of Engineering and IT March – July 2012
  4. 4. Signal operations  Time reversed signal CECOS College of Engineering and IT March – July 2012
  5. 5. Signal operations  Amplitude scaling CECOS College of Engineering and IT March – July 2012
  6. 6. Signal operations  Adding an extra tone to the audio signal CECOS College of Engineering and IT March – July 2012
  7. 7. Signal operations  Down sampling the audio signal by a factor of 3 CECOS College of Engineering and IT March – July 2012
  8. 8. Signal Operations  Changing the samples per second send to sound card CECOS College of Engineering and IT March – July 2012
  9. 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
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