magnetic microphone

magnetic microphone

[mag′ned·ik ′mī·krə‚fōn]
(engineering acoustics)
A microphone consisting of a diaphragm acted upon by sound waves and connected to an armature which varies the reluctance in a magnetic field surrounded by a coil. Also known as reluctance microphone; variable-reluctance microphone.
References in periodicals archive ?
Last week, Amy had an operation at a Nottingham hospital to insert a magnetic microphone under the skin on the side of her head.