H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/28
H04R 25/00 (2006.01)
Patent
CA 1118881
ABSTRACT Hitherto it has not been possible to find a uniform form of construction for hearing aids. At the present time there are several hundred models on the hearing aid market which can be sorted into classes only by individual parameters. In an illustrated embodiment a behind-the-ear hearing aid includes a microphone, an amplifier-low pass filter circuit, an analog to digital converter, a digital integrated circuit arithmetic and logic unit for implementing a n-th order transfer function in the Z domain, a digital to analog converter and an output transducer, for producing the desired sound response. A memory multiplexer is provided for loading of the multiplier coefficients necessary to adapt the transfer function circuit to essentially any class of hearing deficiency into an erasable programmable read only memory (EPROM). The structure is such that the coefficient memory may be loaded after the standard universal hearing aid has been completely assembled, and indeed the hearing aid may be reprogrammed as needed after a period of use, essentially without disassembly.
300796
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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