The INA-5 ( Ideal Cardioid Arrangement ) is a surround microphone array that uses five cardioid microphones resembling the angles of the standardised surround loudspeaker configuration defined by the ITU Rec . 775.
12.
The curve for a standard cardioid microphone, the most common unidirectional microphone, can be represented as 0.5 + 0.5sin ( " ? " ) } } at its target design frequency.
13.
ORTF combines both the volume difference provided as sound arrives on-and off-axis at two cardioid microphones spread to a 110?angle, as well as the timing difference as sound arrives at the two microphones spaced 17 cm apart.
14.
The first model was the KTM small cardioid, later followed by the " fet 70 " series transistorized versions of small omnidirectional, cardioid and speech cardioid microphones as well as a " U 77 " transistorized version of the U 67.
15.
A cardioid microphone exhibits an acoustic pickup pattern that, when graphed in two dimensions, resembles a cardioid, ( any 2d plane containing the 3d straight line of the microphone body . ) In three dimensions, the cardioid is shaped like an apple centred around the microphone which is the " stalk " of the apple.
16.
A "'cardioid microphone "'is effectively a superposition of an omnidirectional and a figure-8 microphone; for sound waves coming from the back, the negative signal from the figure-8 cancels the positive signal from the omnidirectional element, whereas for sound waves coming from the front, the two add to each other.
