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Boundary microphone (Audio-Technica ATM87R) 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.
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.
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.
The American D-22 and American D-33 microphones are dual-impedance, omnidirectional, dynamic microphones made by the American Microphone Company. They were used extensively in the broadcast industry in the 1950s because of their modern sleek looks and tapered waist design.
The directionality of the 77-DX is variable. A rotating backshutter on the acoustic labyrinth, controlled by a screwdriver-operated slot at the rear of the microphone, allows the user to vary the microphone's pattern from omnidirectional in the fully closed position, to cardioid, to figure-8 (bidirectional) in the fully open position.
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 The production of the em64 has superseded their previous em32 microphone.
Neumann U 87 with shock mount. Introduced in 1967 as the solid-state successor to the U 67, [4] [5] [1] Neumann introduced the U 87 alongside the KM 86, KM 84, and KM 83 as part of the company's first 'FET 80' series of microphones that utilized use solid-state FET electronics that didn't require separate power supplies or multi-pin power cables and allowed the mics to be made smaller. [6]