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In 1990s, Audio-Technica introduced several large-diaphragm condenser microphones for studio use: the AT4033 cardioid microphone in 1991, [1] the AT4050 multi-pattern in 1995, [6] and the AT4060 vacuum tube cardioid microphone in 1998; [7] the AT895, a DSP-controlled five-element microphone array providing adaptive directional audio acquisition ...
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 electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.
The equipment for the techniques also varies from the bulky to the small and convenient. A-B techniques generally use two separate microphone units, often mounted on a bar to define the separation. X-Y microphone capsules can be mounted in one unit, or even on the top of a handheld digital recorder.
A super-cardioid microphone is similar to a hyper-cardioid, except there is more front pickup and less rear pickup. It is produced with about a 5:3 ratio, with nulls at 126.9°. This ratio maximizes the front-back ratio; the energy ratio between front and rear radiation. [50] [51] The sub-cardioid microphone has no null points. It is produced ...
The U47 was the first condenser microphone switchable between cardioid and omni-directional pick-up patterns. It incorporated the highly successful 12-micron-thick M7 capsule and VF-14 tube amplifier, which was a metal-clad pre-World War II pentode changed to work as a triode. These microphones had evolved from the 1928 CMV3 "bottle" mic ...