|
A VU meter is often included in analog audio equipment to display a signal level in volume units. It has been suggested that this article or section be merged with Analog electronics. ...
Sound is a disturbance of mechanical energy that propagates through matter as a longitudinal wave, and therefore is a mechanical wave. ...
In a communications system, the signal level is the signal power or intensity at a specified point and with respect to a specified reference level, e. ...
 An analog VU meter with peak LED, typical of late 1970s
 The response of a VU meter (black line) compared to instantaneous input level (grey area) of a drum beat. Level is in dB and time is in seconds It is intentionally a "slow" measurement, averaging out peaks and troughs of short duration to reflect the perceived loudness of the material. It was originally developed in 1939 by the combined effort of Bell Labs and broadcasters CBS and NBC, for measuring and standardizing the levels of telephone lines. The instrument used to measure VU is called the volume indicator (VI) instrument. Most users ignore this and call it a VU meter. Image File history File links VU_Meter. ...
Image File history File links VU_Meter. ...
Image File history File links VU-meter-reponse-graph. ...
Image File history File links VU-meter-reponse-graph. ...
A drum beat, a beat on a drum, is any single strike on a single drum, drum machine, or a series of beats on various percussion instruments creating a rhythmic or metric pattern. ...
DB or db or dB may stand for: Database, an organized collection of data David Belle, founder of parkour DB connector, improper term for D-subminiature DB (car), a French automobile maker Dragon Ball, a manga and anime. ...
The horizontal axis shows frequency in Hz Loudness is the quality of a sound that is the primary psychological correlate of physical intensity. ...
Bell Laboratories (also known as Bell Labs and formerly known as AT&T Bell Laboratories and Bell Telephone Laboratories) was the main research and development arm of the United States Bell System. ...
CBS is one of the largest radio and television networks in the United States. ...
NBC (an acronym for National Broadcasting Company, its former corporate name) is an American television network headquartered in the GE Building in New York Citys Rockefeller Center. ...
The telephone or phone is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. ...
0 VU was defined:
The reading of the volume indicator shall be 0 vu when it is connected to a 600-ohm resistance in which is flowing one milliwatt of sine-wave power at 1000 cycles per second.[1][2] A multimeter can be used to measure resistance in ohms Several resistors. ...
Milliwatt (SI symbol: mW) is a unit for measuring electrical power, equal to one-thousandth (10-3) of a watt. ...
The sine wave or sinusoid is a function that occurs often in mathematics, signal processing, alternating-current power engineering, and other fields. ...
The hertz (symbol: Hz) is the SI unit of frequency. ...
The typical VU scale is from −20 to +3. The rise and fall times of the meter are both 300 milliseconds, meaning that if a constant sine wave of amplitude 0 VU is applied suddenly, the meter will take 300 milliseconds to reach the 0 on the scale. It behaves as a full-wave averaging instrument, and is not optimal for measuring peak levels.
The behaviour of VU meters is defined in ANSI C16.5-1942, British Standard BS 6840, and IEC 60268-17. The American National Standards Institute (ANSI) is a private, non-profit standards organization that produces industrial standards in the United States. ...
British Standards is the new name of the British Standards Institute and is part of BSI Group which also includes a testing organisation. ...
The initials IEC can stand for: Independent Electoral Commission Industrial Emergency Council Inertial electrostatic confinement (in fusion energy) Institut des Experts-comptables et des Conseils fiscaux Institut dEstudis Catalans, Catalan Studies Institute Interactive Evolutionary Computation International Education Centre International Electrical Congress International Electrotechnical Commission See also IEC connector for...
How to use a VU meter
 Late 1990s SONY TC-RX55 uses fluorescent meters integrated into the display panel Tape and cassette decks typically used physical meters similar to needles on a compass. The needles would be "pegged" when they hit the physical pegs which stopped the maximum motion of the needle. The first high fidelity deck, the Advent used only one meter, which could be switched to average both channels, or either channel, but this was never adopted by any other design. When LEDs were developed, they were often used to indicate peak levels, and later arrays of them replaced mechanical meters, and later LCD and fluorescent displays which are not subject to Newton's laws of motion to limit reaction time. Computer recording software often emulates an array of LEDs. The Nagra V, the latest digital version of a professional reel-to-reel recorder dating from the 1960s still uses analog meters. Image File history File links Download high resolution version (1200x352, 67 KB) Summary Photograph taken by User:GRAHAMUK to serve the article cassette deck, freely given to WP and licensed under GFDL. Licensing File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to...
Image File history File links Download high resolution version (1200x352, 67 KB) Summary Photograph taken by User:GRAHAMUK to serve the article cassette deck, freely given to WP and licensed under GFDL. Licensing File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to...
Nagra is a generic term referring to any of the series of professional audio recorders produced by Kudelski S.A., based in Cheseaux-sur-Lausanne, Switzerland. ...
Peak levels may be displayed in addition to the current level. As a rule, recording levels should be set so that they do not exceed the red area beyond 0 VU or only rarely. If the level is set too low, noise levels will be high. If set too high, the sound quality and frequency response is typically poorer at high recording levels, and clipping effects can be especially severe for a digital recording system. Systems tailored for voice often incorporate automatic level control, usually not defeatable in inexpensive recorders.
VCR's only rarely included VU meters when they provided a manual level control, which is typically required for recording live music rather than compressed television or radio broadcasts. Audio level compression, also called dynamic range compression, volume compression, compression, limiting, or DRC (often seen in DVD player settings) is a process that manipulates the dynamic range of an audio signal. ...
See also A peak programme meter (PPM) is an instrument for indicating the level, loudness or volume of an electronic audio signal. ...
Programme level refers to the level that an audio source is transmitted or recorded at, and is important in audio if listeners to CDs, radio and television are to get the best experience, without excessive noise in quiet periods or compression of loud sounds. ...
Peak Meter is a type of visual device that indicates the voltage level of the signal that is passing through it. ...
The term Audio equipment refers to any device designed principally to reproduce broadcast or recorded sounds. ...
Loudness monitoring of programme levels is needed in radio and television broadcasting, as well as in audio post production. ...
BBC Local Radio Mark III radio mixing desk In professional audio, a mixing console, mixing desk (Brit. ...
The Crest factor of a waveform is equal to the peak amplitude divided by the RMS value. ...
The decibel (dB) method of calculation , that uses a logarithm to allow very large or very small relations to be represented with a conveniently small number (similar to scientific notation). ...
External links |
Feeds |
Contact