How to analyse and create a filter in MATLAB for recorded audio?

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Hi, I have recorded the signal in an audio file using MATLAB. How do I normalise amplitude of recorded signal to a maximum value of 1 and why does it need to be normalised?

Answers (1)

Walter Roberson
Walter Roberson on 27 Nov 2016
Edited: Walter Roberson on 27 Nov 2016
new_signal = old_signal ./ max(old_signal(:));
However, keep in mind that it is possible that you happened to have a sample that was more negative than the maximum signal was positive, such as if the signal peaked at -2.1343 in the negative but at +2.1315 in the positive. Normalizing to maximum value 1 could result in values below -1.
"why does it need to be normalised"
Does it need to be normalized? See the first example in filter(), which clearly shows inputs larger than 1.0
Walter Roberson
Walter Roberson on 29 Nov 2016
You could post links here. However, I did not study much signal processing so I might not be able to answer the questions.

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