signal normalization

[Biruntha]

Hi,
can anyone explain briefly what is signal normalization? why we need to normalization a signal?

 

[KlausST]

Hi,

A bit more information please.

Are you talking about digital data, analog data like sensor or audio?

Klaus

 

[Biruntha]

I'm looking for digital audio data

 

[Biruntha]

I found this code to normalize. please explain how it works as steps.

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if std(signal) < 1.0e-7
    signal= signal- mean(signal);   % neutralization
else
    signal= signal- mean(signal);   % neutralization
    signal= signal/ std(signal);    % normalization

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Thankyou

 

[D.A.(Tony)Stewart]

Audio peaks may be compressed or normalized with linear gain by post processing or pre-processing to meet desired standard output levels such as xVpp or x dBmV or x Vrms determined by the interface input. This may be required to limit modulation for example or normalize many signals to be mixed or maximize SNR.

this code does none of the above and uses 2 unknown constants, mean and std. But may elsewhere be trying to compute mean and std deviation.. It appears to use assume unsigned or rectified signals

To normalize implies measuring unsigned peaks then scaling by max value to get a gain to factorize every value (post-processing, linear) for streaming , adjusting gain by 1 dB increments with a quasi-peak detection method is used by Sony professional equipment.

 

[KlausST]

Hi,

Your code makes that - during quiet phases - the DC offset is cancelled
And during loud phases additionally the volume is adjusted.

Klaus

 

[SanjKrish]

Normalizing a signal x = x / (|x|^2)

where the signal x is a vector.

We do normalization to scale the signal magnitude to unity without changing the direction of the vector. This is done usually when the signal x is too high or too low(close to zero).