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Entries found for search: envelope

auxiliary envelope : An extra envelope in a synthesizer that, instead of being hard-wired to a filter or amplitude, is intended as a modulation source that can be applied to various destinations.

envelope : The shape of the amplitude vs. time graph of a musical sound; the shape of a sound as it changes over time. The shape of a synthesizerís envelope is controlled by a set of rate (or time) and level parameters. The envelope is a control signal that can be applied to various aspects of a synthesizerís sound, such as pitch, filter rolloff frequency, and overall amplitude. Usually, each note has its own envelope(s).

envelope follower : A device used in electronic music synthesis that converts the envelope of a musical signal into a control voltage. That is, the output voltage will be low when the signal is soft and high when the signal is loud. The control voltage can then be used to control any number of parameters in the synthesizer.

envelope generator : A hardware device or software routine that generates a sound envelope. Also known as a contour generator or transient generator because the envelope is a contour (shape) that is used to create some of the transient (changing) characteristics of the sound over time. The purpose of an envelope generator is to give a shape to each note. By itself, an envelope generator makes no sound. Its output is used as a control source that tells some other part of the synthesizer what to do. Typical synths have three envelope generators for each oscillator: one to control pitch, one to control the filter rolloff, and one to control amplitude. See ADSR.

envelope tracking : A function that changes the length of one or more envelope segments depending on which key on the keyboard is being played. Envelope tracking is most often used to give higher notes shorter envelopes and the lower notes longer envelopes, mimicking the response characteristics of percussion-activated acoustic instruments. Also called keyboard tracking, key follow, and keyboard rate scaling. See ADSR.

four-stage envelope : The Yamaha DX7 synthesizer introduced a new type of envelope generator, one which had four rate control and four level control parameters, for a total of eight parameters. Each rate parameter controls how long it takes the envelope to move from one level to the next. This is referred to as a four-stage envelope because each rate/level pair is considered a stage. Technically, ann ADSR envelope only has one true stage, the decay/sustain stage and two more partially controllable stages because the attack and release levels awere fixed at 100% and zero, respectively.

harmonic envelope : The natural decay in the harmonics of a natural instrument over time.

timbre envelope : The change in the tone of an instrument over time.

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