(57) A hearing aid (12,14), having alterable parameters, includes analog-to-digital input
circuitry (30) for forming a digital signal representative of an incident acoustic
wave. A digital signal processor (32), coupled to said input circuitry (30), forms
and processes, at a first rate, first and second frequency distinguishable data streams
representative, at least in part, of the digital signal. A control unit (34) coupled
to said processor (32) includes circuitry for logarithmically processing at least
one of the digital data streams, at a reduced rate which is less than the first rate.
A parameter value storage memory (34b) is coupled to the unit (34), and an interface
(38) is provided for accessing the memory (34b) and altering parametric values stored
therein.
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