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"Sound recording and reproduction" Definition:
Sound recording and reproduction is the electrical or mechanical inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects. The two main classes of sound recording technology are analog recording and digital recording. Analog recording is achieved by a small microphone diaphragm that can detect changes in atmospheric pressure (acoustic sound waves) and record them as graphic sound waves on a medium such as a phonograph (in which a stylus senses grooves on a record) or magnetic tape (in which electrical current waves from the microphones are converted to electromagnetic fluctuation (flux) that modulate an electric signal. Analog sound reproduction is the reverse process, with a bigger loudspeaker diaphragm causing changes to atmospheric pressure to form acoustic sound waves. Digital recording and reproduction uses the same analog technologies, with the added digitization of the sonographic data and signal, allowing it to be stored and transmitted on a wider variety of media. The digital binary numeric data is a representation of the periodic vector points in the raw analog acoustic data at a sample rate most often too frequent for the human ear to distinguish differences in quality. Digital recordings are not necessarily at a higher sample rate, but are often considered higher quality because of less interference from dust or electromagnetic interference in playback and less mechanical deterioration from corrosion or mishandling the storage medium.
(This definition is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sound recording and reproduction".)

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