Patent ID: 11922917
Assignee: AMS AG
Field: Other consumer goods (Other fields)
Classification: CPC G  H | IPC G  H

Claim 17:
18. A signal processing method for an ear mountable playback device with a speaker generating a speaker signal based on an audio output signal, with a further microphone configured to generate a noise signal on the basis of ambient noise, and with an error microphone configured to generate a disturbed audio signal on the basis of the speaker signal and the ambient noise, the method comprising
generating a first compensation signal by applying filter operations of a first noise filter to the noise signal;
generating the audio output signal by superimposing an audio signal, the first compensation signal and a second compensation signal;
generating a third compensation signal by applying filter operations of a compensation filter to the audio signal; and
generating the second compensation signal by applying filter operations of a second noise filter to an intermediate compensation signal that is generated by subtracting the third compensation signal from the disturbed audio signal;
generating a compensated error signal based on the disturbed audio signal and the third compensation signal;
estimating a leakage condition on the basis of the first noise filter or of the disturbed audio signal and the audio output signal;
adapting the first noise filter based on the compensated error signal; and
adapting the compensation filter based on the leakage condition, wherein
for generating the compensated error signal, an adjustable gain is applied to the third compensation signal and
for generating the intermediate compensation signal, the adjustable gain is not applied to the third compensation signal.