Patent ID: 8411888

Claim:
A hearing aid comprising: an input transducer for producing an input signal representing a sound event; a hearing aid processor for processing the input signal to produce an output signal; an output transducer responsive to said output signal; and a logging device having: a classification means processing the input signal and classifying the sound event among a predefined set of sound environments; a timer triggering the classification means to output the classification of the sound event; a memory having a set of histogram counters corresponding to said predefined set of sound environments, wherein in at least one of said counters is incremented in respect of the sound environment depending on the output from the classification means; an analyzer monitoring the counters, and upon detection of counter overflow: analyzing values of said counters in order to evaluate the sound environment homogenousity over time; rebasing all histogram counters by dividing the contents by a predetermined factor; and adjusting a triggering rate of the timer in dependence of the sound environment homogenousity evaluation.