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An analog VU meter with peak LED. A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment.. The original design was proposed in the 1940 IRE paper, A New Standard Volume Indicator and Reference Level, written by experts from CBS, NBC, and Bell Telephone Laboratories. [1]
The design for most of these products featured a true dual-mono path for stereo output (where no electrical components are shared between left- and right-channel amplification). Front plates were typically made in brushed aluminium with aluminium knobs and switches, glass covers, and in some cases analog VU meters.
Under normal situations, the 0 VU reference allows for a headroom of 18 dB or more above the reference level without significant distortion. This is largely due to the use of slow-responding VU meters in almost all analogue professional audio equipment, which, by their design and by specification, respond to an average level, not peak levels.
These were Type II PPMs with the seven marks labelled −22, −16, −12, −8, −4, 0 and +4. ABC found that a modified version of the EBU meter based on the VU-meter 'A scale' was best, since it let operators use their usual jargon such as 'zero level' etc. [19] The appearance is similar to an EBU scale except that the numbers are 8 dB lower.
This can be useful in many applications, but the human ear works much more like an average meter than a peak meter. The analog VU meters are actually closer to the human ear's perception of sound level because the response time was intentionally slow - around 300 milliseconds, [2] and thus, many audio engineers and sound professionals prefer to ...
A goniometer is often included in analog audio equipment to display a Lissajous figure which shows the amount of stereo (that is, phase differences) in a dual-channel signal. [1] It allows the sound technician to adjust for optimal stereo and determine the makeup of errors such as an inverted signal.
HiFi-Tapedeck by Technics with analog VU-meters (1977) A variety of noise reduction and other schemes are used to increase fidelity, with Dolby B being almost universal for both prerecorded tapes and home recording. Dolby B was designed to address the high-frequency noise inherent in cassette tapes, and along with improvements in tape ...
Nagra III with Pilottone Nagra VI. Nagra is a brand of portable audio recorders produced from 1951 in Switzerland. Beginning in 1997 a range of high-end equipment aimed at the audiophile community was introduced, and Nagra expanded the company's product lines into new markets.
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