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Simulations of the effect of unlinked cochlear-implant automatic gain control and head movement on interaural level differences
- Source :
- The Journal of the Acoustical Society of America. 145(3)
- Publication Year :
- 2019
-
Abstract
- This study simulated the effect of unlinked automatic gain control (AGC) and head movement on the output levels and resulting inter-aural level differences (ILDs) produced by bilateral cochlear implant (CI) processors. The angular extent and velocity of the head movements were varied in order to observe the interaction between unlinked AGC and head movement. Static, broadband input ILDs were greatly reduced by the high-ratio, slow-time-constant AGC used. The size of head-movement-induced dynamic ILDs depended more on the velocity and angular extent of the head movement than on the angular position of the source. The profiles of the dynamic, broadband output ILDs were very different from the dynamic, broadband input ILD profiles. Short-duration, high-velocity head movements resulted in dynamic output ILDs that continued to change after head movement had stopped. Analysis of narrowband, single-channel ILDs showed that static output ILDs were reduced across all frequencies, producing low-frequency ILDs of the opposite sign to the high-frequency ILDs. During head movements, low- and high-frequency ILDs also changed with opposite sign. The results showed that the ILDs presented to bilateral CI listeners during head turns were highly distorted by the interaction of the bilateral, unlinked AGC and the level changes induced by head movement.
- Subjects :
- Physics
Acoustics and Ultrasonics
Movement (music)
Angular displacement
Acoustics
medicine.medical_treatment
1103 Clinical Sciences
respiratory system
01 natural sciences
behavioral disciplines and activities
Article
respiratory tract diseases
body regions
03 medical and health sciences
0302 clinical medicine
Arts and Humanities (miscellaneous)
Cochlear implant
0103 physical sciences
medicine
Automatic gain control
Head movements
Head (vessel)
030223 otorhinolaryngology
010301 acoustics
Subjects
Details
- ISSN :
- 15208524
- Volume :
- 145
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- The Journal of the Acoustical Society of America
- Accession number :
- edsair.doi.dedup.....e14bacc9b76148a9b87a2a5d6eb3448d