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A transformer crystal cartridge control microphone to convert sound waves into af signals.



Related Terms

CRYSTAL CARTRIDGE

A piezoelectric unit used with a stylus in a phonograph pickup to convert disk recordings into audio-frequency signals, or used with a diaphragm in a crystal crude material See raw material.

CRYSTAL HYDROPHONE

A crystal microphone that responds to waterborne sound waves.

CRYSTAL CONTROL

Control of the frequency of an oscillator by means of a quartz crystal unit.

CONTROL TRACK

A supplementary sound track, usually containing tone signals that control the reproduction of the sound track, such as by changing feed levels to loudspeakers in a theater to achieve stereophonic effects.

FEEDBACK COMPENSATION

Improvement of the response of a feedback control system by placing a compensator in the feedback path, in contrast to cascade compensation. Also known as parallel compensation.

GROWN JUNCTION

A junction produced by changing the types and amounts of donor and acceptor impurities that are added during the growth of a semiconductor crystal from a melt. Also known as ground junction.

SPEED

Rate of motion. The terms SPEED and VELOCITY are often used interchangeably but SPEED is a scalar, having magnitude only while VELOCITY is a vector quantity, having both magnitude and direction. Rate of motion in a straight line is called linear speed, while change of direction per unit time is called angular velocity. Subsonic, sonic, and supersonic refer to speeds respectively less than, equal to, greater than the speed of sound in standard air at sea level. Transonic speeds are those in the range in which flow patterns change from subsonic to supersonic, or vice versa.

ANTI-SEA CLUTTER

A radar operational control that limits the return of echoes from nearby waves around a vessel, thus allowing ship targets to be more apparent on the radar screen.

PRESSURESTAT

A control which reacts to pressure changes in the evaporator, receiver or other container. Pressure switch.

DIRECTIONAL HYDROPHONE

A hydrophone whose response varies significantly with the direction of sound incidence.

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