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.
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