In telecommunication, signal processing, and thermodynamics, companding (occasionally called compansion) is a method of reducing the effects of a channel with limited dynamic range. It is a combination of compressing and expanding (the word companding therefore is a portmanteau word), and is a variant of audio level compression. ...more on Wikipedia about "Companding"
The Decca tree is a stereo main microphone recording system for big orchestras. It is a sort of AB recording with a center fill. It is the most commonly used spaced-pair technique. This was developed 1954 by Arthur Haddy and Kenneth Wilkinson to allow the use of three omnidirectional microphones of the type Neumann M 50 to record in stereo. ...more on Wikipedia about "Decca tree"
A hard disk recorder is a type of recording system that utilizes a high-capacity hard disk to record digital audio or digital video. Hard disk recording systems represent an alternative to more traditional reel-to-reel tape or cassette multitrack systems, and provide editing capabilities unavailable to tape recorders. The systems, which can be standalone or computer-based, typically include provisions for digital mixing and processing of the audio signal. ...more on Wikipedia about "Hard disk recorder"
Holophony is an audio recording technique, designed by Argentine researcher Hugo Zuccarelli, which operates on a similar principle to Holography, except it applies these principles to sound and audio recording. It uses a multiple exposure technique where an original recording is combined with a reference recording, and the resulting interference patterns are recorded. The result has been reported to be realistic and life-like three dimensional sounding audio recordings which have been said to exceed the realism of stereo sound. ...more on Wikipedia about "Holophony"
A pop filter or pop shield is an anti-pop noise protection filter for microphones. It serves to reduce popping and hissing sounds in recorded speech and singing. ...more on Wikipedia about "Pop filter"
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