| 摘要 |
A hearing aid which comprises a sound transducer, an analogue-digital converter, a digital processing and adaptation circuit for the processing of digital signals, corresponding to audio signals which are received by the transducer, storage units for the storage of data and programmes for the digital processing and adaptation circuit, a digital-analogue converter and a sound generator. The hearing aid also contains a counter, which registers the time for which the hearing aid has been in use, and a non-volatile storage unit in which the utilisation time is summed up. The hearing aid is arranged in such a manner that a comparison is made between the contents of that part of the non-volatile storage unit in which the summed-up utilisation time is stored and one or more limit values, and so that when one or more of the limit values is reached, a special function is initiated.
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