Hearing aid with preamplifier and post amplifier - has signal path for upper frequency range with limiter circuit and signal path for lower frequency range with circuit for automatic amplification regulation

摘要

The hearing aid includes an amplification setting element (2) with a preamplifier (3) on its input side, and a post-amplification device (4) on its output side. The pre-amp. (3) has a signal path (7) for a lower frequency range and including an automatic gain control (A.G.C.) circuit (8) and a signal path (5) for an upper frequency range, and including a limiting circuit (6) for effecting clipping of input signals which have an amplitude exceeding a preset input threshold level. USE/ADVANTAGE - Good speech discrimination and optimum noise rejection without incurring high circuit design costs.