Abstract

The hearing aid system ( 102 ) has a sound-to-vibration conversion circuitry including a microphone system ( 108 ), an electronic amplifier ( 114 ) and a vibrator ( 120 ). A housing ( 121 ) accommodates the vibrator ( 120 ). The vibrator ( 120 ) is connected to an abutment ( 124 ) that goes through the skin. The abutment ( 124 ) is connected to a fixture ( 126 ) that is anchored in the skull bone ( 128 ). The sound-to-vibration conversion circuitry has an AfD converter ( 212 ) that converts an analogue microphone signal into a digital signal.

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