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A boundary microphone (or pressure zone microphone) is one or more small omnidirectional or cardioid condenser mic capsule(s) positioned near or flush with a boundary (surface) such as a floor, table, or wall. The capsule(s) is/are typically mounted in a flat plate or housing.
An omnidirectional (or nondirectional) microphone's response is generally considered to be a perfect sphere in three dimensions. In the real world, this is not the case. As with directional microphones, the polar pattern for an "omnidirectional" microphone is a function of frequency.
Omnidirectional treadmill, a treadmill that allows a person to walk in any direction without moving Omnidirectional microphone , a microphone that can hear from all directions Mecanum wheel , a specially designed wheel that allows movement in any direction, such as that used by many robots in the RoboCup Small Size League
Typically, an array is made up of omnidirectional microphones, directional microphones, or a mix of omnidirectional and directional microphones distributed about the perimeter of a space, linked to a computer that records and interprets the results into a coherent form. Arrays may also be formed using numbers of very closely spaced microphones.
Example of microphone positioning in a Decca Tree setup. A Decca Tree setup uses three omnidirectional microphones arranged in a "T" pattern outlining a triangle, often equilateral; the center microphone is mixed with the two spaced microphones to fill the "hole in the middle" in their imaging; it points the sound source.
Proximity effect can be viewed in two ways. In some settings, sound engineers may view it as undesirable, and so the type of microphone or microphone practice may be chosen in order to reduce the proximity effect. On the other hand, some microphone users seek to intentionally use the proximity effect, such as beat boxing singers in hip hop music.
The ZYLIA ZM-1 [23] is a commercially available microphone capable of generating third-order ambisonic recordings, using 19 omni-directional capsules. The em64 Eigenmike from mh acoustics [24] is a 64-channel spherical microphone array capable of sixth-order capture. The production of the em64 has superseded their previous em32 microphone.
Outrigger omnidirectional microphones, low-pass filtered at 250 Hz, are spaced 3 meters apart in line with the L and R cardioids. These compensate for the bass roll-off of the cardioid microphones and also add expansiveness. [27] A 3-meter spaced microphone pair, situated 2–3 meters behind the front array, is used for the surround channels. [24]