Method for operating a hearing system and hearing system

A method for operating a hearing system having a first input transducer, a second input transducer and a signal processor, wherein an activity of a lateral useful signal source in an environment of the hearing system being ascertained by the following steps of:

• generating a first input signal from an acoustic signal from an environment that impinges on the first input transducer;
• generating a second input signal from the acoustic signal that impinges on the second input transducer;
• generating a filtered input signal via a directional notch filter based on the first input signal and the second input signal;
• ascertaining a measure for an attenuation that the directional notch filter unit causes based on the filtered input signal and on the first input signal and/or the second input signal, wherein to obtain the measure, a spectral power density for the filtered input signal is determined and compared with a total spectral power density, wherein the total spectral power density is determined based on the first input signal and/or second input signal;
• and
• comparing the measure with a reference, wherein from a comparison, a presence or absence of the activity of the lateral useful signal source in surroundings of the hearing system is inferred.

A hearing system, comprising:

• a first input transducer;
• a second input transducer;
• and
• a signal processor having a directional notch filter and configured, in at least one operating mode, to carry out a method to determine an activity of a lateral useful signal source in an environment of the hearing system, said signal processor configured to:
• generate a first input signal from an acoustic signal from an environment that impinges on said first input transducer;
• generate a second input signal from the acoustic signal that impinges on said second input transducer;
• generate a filtered input signal via said directional notch filter based on the first input signal and the second input signal;
• ascertain a measure for an attenuation that said directional notch filter unit causes based on the filtered input signal and on the first input signal and/or the second input signal;
• compare the measure with a reference, wherein from a comparison, a presence or absence of the activity of the lateral useful signal source in surroundings of the hearing system is inferred;
• and
• ascertain the reference by determining a spectral power density for interference noise, based on the first input signal and/or second input signal.

A hearing system, comprising:

• a first input transducer;
• a second input transducer;
• and
• a signal processor having a directional notch filter and configured, in at least one operating mode, to carry out a method to determine an activity of a lateral useful signal source in an environment of the hearing system, said signal processor configured to:
• generate a first input signal from an acoustic signal from an environment that impinges on said first input transducer;
• generate a second input signal from the acoustic signal that impinges on said second input transducer;
• generate a filtered input signal via said directional notch filter based on the first input signal and the second input signal;
• ascertain a measure for an attenuation that said directional notch filter unit causes based on the filtered input signal and on the first input signal and/or the second input signal, wherein to obtain the measure, a spectral power density for the filtered input signal is determined and compared with a total spectral power density, wherein the total spectral power density is determined based on the first input signal and/or second input signal;
• and
• compare the measure with a reference, wherein from a comparison, a presence or absence of the activity of the lateral useful signal source in surroundings of the hearing system is inferred.