Patent ID: 7209568

Claim:
A hearing aid comprising: a first omnidirectional microphone producing a first microphone signal; a second omnidirectional microphone producing a second microphone signal; said first and second omnidirectional microphones being electrically connected to each other to form a microphone unit, said microphone unit comprising a delay element to which one of said first and second microphone signals is supplied for delaying said one of said first and second microphone signals by a delay time with respect to the other of said first and second microphone signals for giving a microphone unit signal produced by said microphone unit a directional characteristic; an adjustment unit connected to said delay unit for adjusting said delay time dependent on a signal level of an acoustic input signal to at least one of said first and second omnidirectional microphones; a signal processor for processing said microphone unit output signal to produce a processed signal; and an output transducer for converting said processed signal into an audio signal and for emitting said audio signal.