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The point where the waves were stopped at the boundary was called a "pressure field" or "pressure zone". They also noted that using a mic in this set-up leads to a six dB boost in sound pressure. Only two years after Long and Wickersham's research, in 1980 Crown Audio developed and marketed the first boundary mic.
A point source is a single identifiable localized source of something. A point source has a negligible extent, distinguishing it from other source geometries. Sources are called point sources because, in mathematical modeling, these sources can usually be approximated as a mathematical point to simplify analysis.
A microphone, colloquially called a mic (/ m aɪ k /), [1] or mike, [a] is a transducer that converts sound into an electrical signal. Microphones are used in many applications such as telephones , hearing aids , public address systems for concert halls and public events, motion picture production, live and recorded audio engineering , sound ...
In room miking a distant mic, referred to as the room mic, is used in conjunction with a close mic, the room mic is "typically placed far enough past the critical distance in a room that the room's ambience and reverberations transduce at an equivalent, if not greater, volume than the sound source itself."
Acoustic source localization [4] is the task of locating a sound source given measurements of the sound field. The sound field can be described using physical quantities like sound pressure and particle velocity. By measuring these properties it is (indirectly) possible to obtain a source direction.
The Soundfield microphone is an audio microphone composed of four closely spaced subcardioid or cardioid (unidirectional) microphone capsules arranged in a tetrahedron.It was invented by Michael Gerzon and Peter Craven, and is a part of, but not exclusive to, Ambisonics, a surround sound technology.
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