A hearing aid (22) having a microphone (1), a processor (53) and an output
transducer (12), is adapted for obtaining an estimate of a sound
environment, determining an estimate of the speech intelligibility
according to the sound environment estimate, and for adapting the
transfer function of the hearing aid processor in order to enhance the
speech intelligibility estimate. The method according to the invention
achieves an adaptation of the processor transfer function suitable for
optimizing the speech intelligibility in a particular sound environment.
Means for obtaining the sound environment estimate and for determining
the speech intelligibility estimate may be incorporated in the hearing
aid processor, or they may be wholly or partially implemented in an
external processing means (56), adapted for communicating data to the
hearing aid processor via an appropriate link.