ABSTRACT
A microphone capsule translates the energy from sound waves into an electrical signal. It is said to be pressure operated when the sound energy impinges on one side of its diaphragm, the other side being enclosed. When the diaphragm is open to sound waves on each side, it is said to be pressure gradient operated. The latter type tends to be more sensitive than the former, but the signal produced is lower, and thus needs a greater degree of amplification.
