Sound recording and reproduction is an 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.  Acoustic analog recording is achieved by a small  microphone  diaphragm that can detect changes in atmospheric pressure and record them as a graphic representation of the sound waves on a medium such as a  phonograph  (in which a stylus senses grooves on a record). In  magnetic tape  recording, the sound waves vibrate the microphone diaphragm and are converted into a varying  electric current, which is then converted to a varying  magnetic field  by which makes a representation of the sound as magnetized areas on a plastic tape with a magnetic coating on it.   Analog sound reproduction is the reverse process, with a bigger  loud speaker  diaphragm causing changes to atmospheric pressure to form acoustic sound waves. Electronically generated sound waves may also be recorded directly from devices such as an  electric guitar pick up  or a synthesizer, without the use of acoustics in the recording process other than the need for musicians to hear how well they are playing during  recording sessions.

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