Method and hearing aid for the frequency distortion of an audio signal

A method for suppressing an acoustic feedback in an acoustic system, which comprises:

• generating, via an input transducer of the acoustic system, an input signal from a sound signal of an environment;
• generating an intermediate signal via a signal processing unit on a basis of the input signal;
• performing a method for frequency distortion of the intermediate signal, which comprises the steps of:
• dividing the intermediated signal at at least one division frequency into a low-frequency band and a high-frequency band;
• generating a frequency-distorted signal through respectively different distortions of frequencies for the high-frequency band and for the low-frequency band;
• and
• selecting the division frequency in dependence on a given tonal system such that the division frequency is located between two neighboring tones of the given tonal system;
• generating an output signal from the frequency-distorted signal which is converted into an output sound signal by an output transducer of the acoustic system;
• and
• suppressing, on a basis of the frequency-distorted signal, an acoustic feedback occurring in the acoustic system through coupling the output sound signal into the input transducer.

A hearing aid, comprising:

• an input transducer for generating an input signal from a sound signal of an environment;
• a signal processing unit for generating an audio signal on a basis of the input signal;
• and
• a frequency distorter programmed to perform a method for frequency distortion of the audio signal, said frequency distorter programmed to:
• divide the audio signal at at least one division frequency into a low-frequency band and a high-frequency band;
• generate a frequency-distorted signal through respectively different distortions of frequencies for the high-frequency band and for the low-frequency band;
• and
• select the division frequency in dependence on a given tonal system such that the division frequency is located between two neighboring tones of the given tonal system.

A method for frequency distortion of an audio signal, which comprises the steps of:

• dividing the audio signal at at least one division frequency into a low-frequency band and a high-frequency band;
• generating a frequency-distorted signal through respectively different distortions of frequencies for the high-frequency band and for the low-frequency band;
• selecting the division frequency such that the division frequency is located between two neighboring tones of a given tonal system;
• selecting the division frequency from a frequency interval that is located between the frequencies of the two neighboring tones of the tonal system in such a way that a lowest frequency and a highest frequency of the frequency interval are equidistant, or logarithmically equidistant, from the frequencies of the two neighboring tones.

A method for suppressing an acoustic feedback in an acoustic system, which comprises:

• generating, via an input transducer of the acoustic system, an input signal from a sound signal of an environment;
• generating an intermediate signal via a signal processing unit on a basis of the input signal;
• performing a method for frequency distortion of the intermediate signal, which comprises the steps of:
• dividing the intermediated signal at at least one division frequency into a low-frequency band and a high-frequency band;
• generating a frequency-distorted signal through respectively different distortions of frequencies for the high-frequency band and for the low-frequency band;
• and
• selecting the division frequency such that the division frequency is located between two neighboring tones of a given tonal system;
• generating an output signal from the frequency-distorted signal which is converted into an output sound signal by an output transducer of the acoustic system;
• and
• suppressing, on a basis of the frequency-distorted signal, an acoustic feedback occurring in the acoustic system through coupling the output sound signal into the input transducer;
• selecting a provisional division frequency;
• generating an estimation of a transfer function of the acoustic system for the high-frequency band in a region of the provisional division frequency;
• selecting the at least one division frequency to be below the provisional division frequency when an estimated transfer function exceeds a permissible total amplification;
• generating the frequency-distorted signal through a distortion of the frequencies of only the high-frequency band;
• and
• selecting the provisional division frequency such that the provisional division frequency lies between the two neighboring tones of the given tonal system.