Method of an electronic device for filtering interference

1 . A method of operating an electronic device, the electronic device including a receiver configured to receive a wireless analog signal, a converter configured to convert the received analog signal to a digital input signal, a signal processor configured to generate a digital output signal from the digital input signal; and a transmitter configured to transmit the digital output signal as a wireless digital signal, wherein the signal processor and/or the transmitter cause a noise signal in the digital input signal, which is synchronized or correlated with a repetition rate of the wireless digital signal, the method comprising:

generating the digital output signal by filtering the digital input signal, wherein the filtering comprises filtering the digital input signal such that the noise signal is reduced if the noise signal is caused by the signal processor, and if the noise signal is caused by the transmitter, and if the noise signal is caused by the signal processor and the transmitter,

wherein the wireless digital signal includes an audio streaming signal with a first periodicity, and a data connection signal with a second periodicity, and the noise signal includes a corresponding audio streaming noise and data connection noise,

wherein the filtering comprises:

dividing the digital input signal into a number of time samples;

applying, for each time sample, a low pass filter that removes a corresponding noise component in said time sample; and

combining, after the applying, the time samples to the digital output signal, and

wherein the number of time samples is the product of a periodicity of the noise signal and a sample rate of the receiver.

2 . The method according to claim 1 ,

wherein the applying comprises estimating, by the low pass filter, a noise component of the noise signal, and subtracting, by the low pass filter, the noise component that is estimated from the respective time sample.

3 . The method according to claim 1 ,

wherein the electronic device further includes a first low pass filter and a second low pass filter, the first low pass filter having a slower response time than a response time of the second low pass filter, and

wherein the applying comprises:

calculating the root mean square value of the digital input signal;

determining that the root mean square value reaches or exceeds a threshold value; and

filtering, based on the determining, the digital input signal with the first low pass filter having the slower response time.

4 . The method according to claim 1 ,

wherein the filtering further comprises varying filter coefficients for filtering the digital input signal based on the root mean square value of the digital input signal.

5 . The electronic device according to claim 1 , wherein the electronic device further comprises:

a controller configured to perform the method according to claim 1 .

6 . A hearing system comprising the electronic device according to claim 5 .

7 . The hearing system according to claim 6 , comprising a hearing instrument and an additional device configured to be communicatively coupled to the hearing instrument, wherein the additional device is configured to receive wireless analog signals and forwards them as wireless digital signals to the hearing instrument, and wherein the additional device is the electronic device.

8 . A non-transitory computer readable medium storing computer instructions, the computer instructions configured to, when executed by at least one processor, cause the at least one processor to perform the method according to claim 1 .

9 . The method according to claim 1 , wherein a periodicity of the audio streaming noise and a periodicity of the data connection noise are different from each other and are multiples of each other.

10 . The method according to claim 9 , wherein the number of time samples is a product of the sample rate of the receiver and a largest periodicity from among the periodicity of the audio streaming noise and the periodicity of the data connection noise.

11 . The method according to claim 1 , wherein the periodicity of the noise signal is known in advance by the electronic device.