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for more information about audio signal processing


Audio signal processing, sometimes referred to as audio processing, is the intentional alteration of auditory signals, or sound. As audio signals may be electronically represented in either digital or analog format, signal processing may occur in either domain. Analog processors operate directly on the electrical signal, while digital processors operate mathematically on the binary representation of that signal.

refered by wikipedia

and you please check out the below page link also :::
http://cs.tut.fi/sgn/arg/intro/basics.html