Comparison of dual-time-constant and fast-acting automatic gain control (AGC) systems in cochlear implants.
Cochlear implants usually employ an automatic gain control (AGC) system as a first stage of processing. AGC1 was a fast-acting (syllabic) compressor. AGC2 was a dual-time-constant system; it usually performed as a slow-acting compressor, but incorporated an additional fast-acting system to provide protection from sudden increases in sound level. Six experienced cochlear-implant users were tested in a counterbalanced order, receiving one-month of experience with a given AGC type before switching to the other type. Performance was evaluated shortly after provision of a given AGC type and after one-month of experience with that AGC type. Questionnaires, mainly relating to listening in quiet situations, did not reveal significant differences between the two AGC types. However, fixed-level and roving-level tests of sentence identification in noise both revealed significantly better performance for AGC2. It is suggested that the poorer performance for AGC1 occurred because AGC1 introduced cross-modulation between the target speech and background noise, which made perceptual separation of the target and background more difficult.
Boyle
Patrick J
PJ
Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge, UK. patrickb@abionics.fr
Büchner
Andreas
A
Stone
Michael A
MA
Lenarz
Thomas
T
Moore
Brian C J
BC
D000161:Acoustic Stimulation; D000328:Adult; D000368:Aged; D001307:Auditory Perception; D003054:Cochlear Implants; D003638:Deafness / Q000523:psychology / Q000628:therapy; D006801:Humans; D008875:Middle Aged; D009146:Music; D010470:Perceptual Masking; D012984:Software; D013060:Speech; D013067:Speech Perception; D011795:Surveys and Questionnaires