ENVELOPE By N., Pam M.S. - April 7, 2013 Accoustics. The slowly variation or smooth change in amplitude. ENVELOPE: "An envelope is used in accoustics to describe smooth cahnges of sound." Related Psychology Terms GOOD GENES HYPOTHESIS ROUGHNESS PERSONAL EQUATION ADJUSTMENT C FIBER SELECTIVE ADAPTATION ACTIVATION THEORY OF EMOTION CASE ALTERNATION STAGE 4 SLEEP BURST-PAUSE FIRING Cite this page: N., Pam M.S., "ENVELOPE," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/envelope/ (accessed April 17, 2021).