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), this currently applies to passenger cars. from the 29th October 2012, ECWVTA was extended to cover all new road vehicles and their trailers.ype Approval is not a term confined to a particular industry. Type Approval requirements exist for products as diverse as marine equipment, mobile phones, automotive industry, or medical equipment. Type approval simply means that the product is certified to meet certain requirements for its type, whatever that may be.