Audio signal processing, sometimes referred shortly to as audio processing or just audio, is the processing of some representation of auditory signals, that is sound. The representation can be digital or analog. An analog representation is usually electrical where the voltage level implies the pressure level (that is, the sound). Similarly, a digital representation expresses the pressure wave-form in a binary sequence.
The focus in audio signal processing is most typically in an analysis of which parts ofa signal is 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 human hearing system, but very much by psychological properties. These properties are analysed within the field of psychoacoustics.
Processing methods and application areas include such as storage, compression, transmission, enhancement (e.g., equalization, filtering, noise cancellation, echo removal or addition etc.), source separation, sound effects and computer music.
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