Audio signal processing, sometimes referred to as audio processing, is the processing of a representation of auditorysignals, or sound. The representation can be digital or analog. An analog representation is usually electrical; a voltage level represents the air pressurewaveform of the sound. Similarly, a digital representation expresses the pressure wave_form as a sequence of symbols, usually binary numbers.
The focus in audio signal processing is most typically an analysis of which parts of the signal are audible. For example, a signal can be modified for different purposes such that the modification is controlled in the auditory domain. Which parts of the signal are heard and which are not, is not decided merely by physiology of the humanhearing system, but very much by psychological properties. These properties are analysed within the field of psychoacoustics.
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