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Elsewhere on the web
Certain techniques, such as beam forming, require a specialized cardioid unidirectional microphone.
The most important example is the cardioid pattern, where the directional function D can be expressed as D = 1+cos (θ), θ being the direction of arrival of sound.— FreshPatents.com: Notable Patent Applications - 05/07/2009
The previously discussed omnidirectional patterns are also called zeroth-order patterns and the other patterns mentioned previously (dipole and cardioid) are called first-order patterns.— FreshPatents.com: Notable Patent Applications - 05/07/2009
The first position uses a cardioid pattern, the second position uses a cardioid pattern with a -10 dB pad and the third position activates the omnidirectional pattern.— ARRL Amateur Radio News
A "cardioid" mike is the most common type of directional mike because it picks up audio thru a heart-shaped pattern radiating out from the front part of the microphone.— Find Free Articles - ArticlesBase
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