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Glossary – V

The technique of varying the groove spacing in relation to displacement amplitude of the cutting stylus.
Any oscillator used to drive a tape recorder's capstan motor at various speeds, to effect pitch and tempo changes.
The speed at which sound travels away from a sound source. The velocity of sound is 1,087 feet per second at a temperature of 32 degrees F.
Difference in performance of a magnetic tape when it is run in the opposite direction; caused by asymmetrical distribution of the magnetic particles in the coating.
A loudspeaker enclosure, with an open port cut into the front baffle. Also called a bass reflex enclosure.
The coil winding attached to the diaphragm of a dynamic microphone or loudspeaker.
Practical unit of electrical pressure or of electro-motive force, of such a magnitude that if a pressure of one volt is applied across a resistance of one ohm, a current of one ampere will flow (see Ohm's Law).
The difference in potential between two points in an electrical circuit.
Amplifier whose gain is controlled by an external DC voltage.
Intensity of program, or of noise, expressed in decibels relative to a standard reference volume or zero volume, according to the readings of a program meter, the characteristics of which must be specified in order to define the volume accurately.
A unit for expressing the magnitude of a complex electric wave such as that corresponding to speech or music. The volume in volume units is equal to the number of decibels by which the wave differs from a reference volume.
A volume indicator the specification of which is given in American Standard 'Volume Measurements of Electrical Speech and Program waves'.

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