Everyone’s listened to an audio recording or a watched a television show with audio sound before, but you probably haven’t wondered where it all comes from. Sound is one of the most important aspects to any audio / visual production – without it, it all pretty much falls apart, since no one wants to sit through a silent presentation. A lot of what you hear is brought forth thanks to the techniques behind audio recording and reproduction.

Audio recording and reproduction involves the inscription and recreation of sound waves, usually through electrical or mechanical means. These sound waves represent vocal or instrumental sounds, which are converted into the audio we recognize once it all hits the ears. There are two versions of audio recording technology – analog recording and digital recording. Analog recording involves a small microphone that picks up sound waves by monitoring changes in atmospheric pressure. Then those waves are recorded on a medium that can be used for later playback, such as a phonograph or magnetic tape. Audio reproduction is essentially the reverse of this process.

Digital audio recording and reproduction operates just about the same way as analog audio counterpart. The only difference is that the sound waves are digitalized, meaning that the information can be stored and replayed on a wider variety of media. This is essentially how you can play a song on your MP3 player. The big advantage to digital audio recording and reproduction is that the quality is much better thanks in part to the lack of interference that could come from environmental, mechanical and electromagnetic conditions. Also the media itself can be handled without worry over distorting or otherwise ruining the audio by mishandling it.

There are a lot of formats that have been used to store audio data, with the first practical medium being that of the mechanical phonograph cylinder, patented in 1878. This would be the main format until the 1900s, when the disc phonograph was put into use. Magnetic tape, including cassette tapes and 8-tracks, would come along over the years as the preferred medium, until the advent of the audio CD in the 1990s and the digital MP3 format nearly a decade later.

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