You searched for: “microphone
microphone, microphonic
An instrument whereby sound waves are caused to generate or modulate an electric current usually for the purpose of transmitting or recording speech or music.
Word Entries containing the term: “microphone
electret microphone
1. A microphone that has an electret transducer capable of converting audio waves into electromagnetic waves.
2. A microphone consisting of an electret transducer in which the foil electret diaphragm is placed next to a perforated, ridged, metal or metal-coated backplate, and output voltage, taken between diaphragm and backplate.

It is proportional to the displacement of the diaphragm or a thin, flexible sheet that can be moved by sound waves, as in a microphone, or which can produce sound waves when moved, as in a loudspeaker.

This entry is located in the following unit: electro-, electr-, electri- (page 4)
electronic microphone
1. A mechanism that depends for its operation on the generation of a voltage by the motion of one of the electrodes in a special electron tube.
2. A microphone whose vibrations or sound waves act on one of the electrodes in an electron tube.
This entry is located in the following unit: electro-, electr-, electri- (page 66)
electrostatic microphone, capacitor microphone, condenser microphone
1. A microphone consisting essentially of a flexible metal diaphragm and a rigid metal plate that together form a two-plate air capacitor.

Sound waves set the diaphragm in vibration, producing capacitance variations that are converted into audio-frequency signals by a suitable amplifier circuit.

2. A microphone design where a condenser (the original name for a capacitor) is created by stretching a thin diaphragm in front of a metal disc (the back plate).

By positioning the two surfaces very close together an electrical capacitor is created so the capacitance varies as a function of sound pressure.

Any change in sound pressure causes the diaphragm to move, which changes the distance between the two surfaces.

Electrostatic microphones, unlike other types, require a battery or other voltage source.

This entry is located in the following unit: electro-, electr-, electri- (page 84)