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.
LED Lighting Facts testing laboratory approval is granted to partners that have submitted proof of accreditation by the National Voluntary Laboratory Accreditation Program (NVLAP), a program administered by the National Institute of Science and Technology (NIST) that provides an unbiased third-party evaluation to testing and calibration laboratories ...