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.
1 European Community Whole Vehicle Type Approval (ECWVTA) - used by manufacturers or importers of large numbers of vehicles or those selling in Europe. 2  European Community Small Series Type Approval (ECSSTA) - used by manufacturers or importers of very low numbers of specific cars.ou can get a single vehicle or small number of vehicles approved through: 1  Individual Vehicle Approval (IVA). 2  Motorcycle Single Vehicle Approval (MSVA) if youâre making or importing a single 2, 3 or smaller 4-wheeled vehicle.