Glossary of Terms - V

A glossary of terms covering lighting, audio, vision and staging in the event and theatrical industry.

There can be a number of meanings for some terms which can vary from country to country and manufacturer to manufacturer. Information within this guide is indicative and every situation can require a different approach and solution. All care has been taken, however, Image Group NZ accepts no responsibility for inaccuracies. If you have any suggestions, comments or queries regarding this list please contact us.

V

VELOCITY
In audio the velocity or speed of sound is approximately 1130 feet per second. The speed of sound changes slightly with changes in temperature, humidity, and altitude.

VERTICAL FREQUENCY
This indicates how many times per second the graphics adapter can draw all the lines on the screen. A higher vertical frequency or refresh rate will produce less flicker.

VESA
Video Electronics Standards Association. An association whose mission is to promote and develop timely, relevant, open display and display interface standards, ensuring interoperability and encouraging innovation and market growth.

VGA
VGA is used to define a specific display resolution. Resolution is defined by the number of individual dots that a display uses to create an image. These dots are called pixels. A VGA display has 640 horizontal pixels and 480 vertical pixels giving a total display resolution of 307,200 individual pixels that are used to compose the image delivered by a projector.

VISUAL CUE
A cue taken by a technician from the action on stage rather than being cued by the stage manager. Often abbreviated to "Vis".

VOICE COMPRESSION
The conversion of an analog voice signal into a digital signal using minimum bandwidth (16 kbps or less).

VOLTAGE

    The pressure at which electric current is available. The New Zealand standard voltage is 240 Volts.
    The scientific name for Voltage is Electromotive Force.

VOLT (VOLTAGE)
Potential difference or electromotive force (EMF).

VOLUME
The intensity or loudness of sound.

VU (VOLUME UNIT)
A unit for expressing the audio frequency power level of a complex electronic waveform such as that corresponding to speech or music. 0 VU is referenced to 1 milliwatt of power.

VU METER
A meter than indicates the audio frequency power level or volume units of a complex electronic waveform.

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