What is "Pressure-Gradient Microphone"?

Pressure-Gradient Microphone

A microphone in which both sides of the diaphragm are exposed to sound, and the microphone is therefore responsive to the pressure differential (gradient) between the two sides of the membrane. The directionality of microphones is controlled by the amount of sound entering the backside. The extremes are full access to the back (figure-of-eight) or fully closed-back (omnidirectional).

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