Cox, Johnson, and Alexander (2012) report cochlear dead regions (DRs) occur when inner hair cells at a given frequency are lost or malfunctioning. Previous publications have suggested hearing-aid high-frequency gain should be attenuated in the presence of high frequency DRs.
Precondition for a VdS approval procedure, among others, is proof of a certified quality management system in accordance with DIN EN ISO 9001 for the manufacturing facility of the product.
VSD: Vykon Tridium Distributor (energy control services) VSD: Volunteer San Diego (San Diego, CA) VSD: Voltage Sensitive Dye (imaging) VSD: Virtualized Software Development (Virtutech, Inc.) VSD: Virus Signature Database (antivirus software) VSD: Vail School District (Arizona) VSD: Valley Sanitary District (various locations) VSD: Vascular-Streak Dieback (disease) VSD