tags: mus-407 sound sound-properties amplitude

Envelope

An envelope is a function representing change in some parameter over time.

• at minimum, an [amplitude] envelope specifies attack time and release time
• air particles, and therefore [sound], cannot move or stop instantaneously

ADSR

An ADSR envelope specifies Attack time, Decay time, Sustain level, and Release time

[Transient]: envelope region during which amplitude is changing

Steady-state: envelope region during which amplitude is constant