One of the most common ways an audio signal can be processed is by changing its amplitude.

 

Amplitude conceptually represents the strength of a signal. It is the force sound exerts on an environment. It is the level of sound pressure.

 

A signal’s amplitude is related to whether it is perceived as being loud or quiet. Therefore, this is an obvious characteristic of a signal¬†to want to process.

 

You have likely had an experience using some sort of volume knob or volume slider. In essence, this control allows you to change the amplitude of a signal.

 

 

If you working with digital audio, a signal’s amplitude can be changed by multiplying each sample by a gain factor.

 

In this section, I will demonstrate several common ways of processing a signal’s amplitude, starting with a linear gain change.

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