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Delay is an audio signal processing technique that records an input signal to a storage medium and then plays it back after a period of time. When the delayed playback is mixed with the live audio, it creates an echo-like effect, whereby the original audio is heard followed by the delayed audio.
A similar technique to ADT is doubling echo, which uses short delays to mimic the double-tracking effect. Many effects units were developed to produce similar sounds, such as chorus , flangers , and phasers , all of which use an oscillating delay (or, in the phaser, a variable phase network).
Echoplex EP-2. The Echoplex is a tape delay effects unit, first made in 1959.Designed by engineer Mike Battle, [1] the Echoplex set a standard for the effect in the 1960s; according to Michael Dregni, it is still regarded as "the standard by which everything else is measured."
Delay/echo: Delay/echo units produce an echo effect by adding a duplicate instrument-to-amplifier electrical signal to the original signal at a slight time-delay. The effect can either be a single echo called a "slap" or "slapback", or multiple echos. A well-known use of delay is the lead guitar in the U2 song "Where the Streets Have No Name ...
Latency refers to a short period of delay (usually measured in milliseconds) between when an audio signal enters a system, and when it emerges.Potential contributors to latency in an audio system include analog-to-digital conversion, buffering, digital signal processing, transmission time, digital-to-analog conversion, and the speed of sound in the transmission medium.
The Roland Space Echo is a line of tape delay units introduced by Roland Corporation in 1974. Whereas prior tape delay effects used tape reels, the Space Echo uses a free-running tape transport system. This reduces tape wear, noise, and wow and flutter, and made the units more reliable and easy to transport.
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If the delay is fairly significant (more than a few hundred milliseconds), it is considered annoying. If the delay is very small (tens of milliseconds or less [3]), the phenomenon is called sidetone. If the delay is slightly longer, around 50 milliseconds, humans cannot hear the echo as a distinct sound, but instead hear a chorus effect. [3]