I love games... and fancy computers. When I find something interesting related to computer gaming and technology in general, this is where I'll post it. Shoot it if it moves!
A device which produces a control signal which varies in level with time. The simplest of these (sometimes called ADSR) has four parameters: Attack Time, Decay Time, Sustain Level & Release Time. Thus it has three time constants and one level constant. Such a device is often found on synthesisers, where it is usually used to control the volume of an amplifier, the cut off frequency of a filter, or the frequency of an oscillator. More complex arrangements involving a series of time and level constants are available, particularly on digital synthesisers. These are called multistage envelopes and may involve eight or more parameters usually in time and level pairs.
synthesiser
