The E page

Envelope

The envelope is an term to describe how a sounds intensity is changed over time.

Envelope Follower

An envelope follower will monitor the intensity of an input signal and output a signal which follows this intensity. Envelope followers can be used to process signals intensity, in such system will the envelope follower be a form of detecor where as for instance VCAs can be used as modulators. Example of such applications are compressors, limiters, expanders, hold-pedals and vocoders.

Envelope Generator

A generator which generates an envelope. Of the many forms of envelope generators can one find AR, ASR and ADSR. They are combinations of various envelope characteristics like attack, decay, sustain and release which determines the shape and time of the various phases of an envelope. An envelope is triggered via an gate or trigg input. Some or all of the parameters may be controled by input signals.

EQ

Short for equaliser.

Equaliser

A filter which will raise (boost) or lower a portion of the frequency spectra while leaving the other ranges relatively untouched. An equaliser is used to (as the name implies) equalise the frequency curve so that the total frequency curve of a system becomes flat(er). Equalisers normaly work in one of more band-pass regions and may also have an upper and/or lower shelf adjustment.