Editing Acoustical engineering (section)

===Audio signal processing===
{{main|Audio signal processing}}

Audio signal processing is the electronic manipulation of audio signals using [[Analog signal processing|analog]] and [[digital signal processing]]. It is done for a variety of reasons, including:
* to enhance a sound, e.g. by applying an audio effect such as [[reverberation]];
* to remove unwanted noises from a signal, e.g. [[echo cancellation]] in [[Voice over IP|internet voice calls]];
* to compress an audio signal to allow efficient transmission, e.g. perceptual coding in [[MP3]] and [[Opus (audio format)|Opus]] 
* to understand the content of the signal, e.g. identification of music tracks via [[music information retrieval]].<ref name="auto1">{{cite book|last=Pohlmann|first=Ken|title=Principles of Digital Audio, Sixth Edition|year=2010|publisher=McGraw Hill Professional|isbn=9780071663472|page=336}}</ref>

[[Audio engineers]] develop and use audio signal processing algorithms.