Implantable filter regulation

An apparatus, comprising:

• a first implantable sensor configured to capture signals comprising acoustic sounds and vibration signals;
• a second implantable sensor configured to capture signals comprising at least vibration signals;
• an implantable sound processing module configured to filter the vibration signals from the implantable sound signals based on a coherence between the signals captured by the first implantable sensor and the signals captured by the second implantable sensor to generate output signals;
• and
• an implantable stimulator unit configured to generate, based on the output signals, stimulation signals for delivery to a recipient of the apparatus to evoke perception by the recipient of the acoustic sounds.

One or more non-transitory computer readable storage media comprising instructions that, when executed by at least one processor, are operable to:

• obtain signals detected by an implantable microphone configured to be implanted in a recipient;
• obtain signals detected by an implantable vibration sensor configured to be implanted in the recipient;
• and
• adaptively equalize a response of the implantable microphone to a response of an external microphone based on a coherence between the signals detected by the implantable microphone and the signals detected by the external microphone.