Definitions for "Cardioid"
An algebraic curve, so called from its resemblance to a heart.
(kar' de-oid') A directional microphone with a heart shaped, narrow pattern, which picks up from directly in front of the mic. Very useful for recording drums.
A mic pickup pattern that when viewed from the side, is roughly heart-shaped, with a null directly behind the mic. The mic is essentially unidirectional, rejecting sound from the rear. Cardioid patterns, in increasing order of tightness, are cardioid, supercardioid and hypercardioid. The latter two patterns, while tighter than the original cardioid pattern, actually have small on-axis pickup lobes directly to the rear of the mic, meaning that a monitor wedge set up in company with the mic must be placed somewhat off to the side.
A special case of epicycloids. A plane curve traced by a point on a circle rolling on the outside of a circle of equal radius.
an epicycloid in which the rolling circle equals the fixed circle
In geometry, the cardioid is an epicycloid with one cusp. That is, a cardioid is a curve that can be produced as the path (or locus) of a point on the circumference of a circle as that circle rolls around another fixed circle with the same radius.
Keywords:  cart, carrier, machine
Carrier Cart Machine