Patent ID: 11961532
Assignee: GOOGLE LLC
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A system comprising:
a plurality of external microphones configured to sense external sounds through air conduction and generate external microphone signals corresponding to the sensed external sounds;
an internal microphone configured to sense a bone conduction sound from a user during speech and generate an internal microphone signal corresponding to the sensed bone conduction sound;
a lowpass processing branch configured to process the external microphone signals and the internal microphone signal through a lowpass process comprising filtering by a low frequency spatial filter, filtering by a low frequency spectral filter, and generating one or more lowpass processed signals based at least in part on an output of the low frequency spectral filter;
a highpass processing branch configured to process the external microphone signals, and not the internal microphone signal through a highpass process to generate one or more highpass processed signals, the highpass process comprising:
obtaining high frequency voice and error estimates based at least in part on filtering a second set of signals corresponding to the external microphone signals by a high frequency spatial filter; and
obtaining a second output of a high frequency spectral filter based at least in part on filtering the high frequency voice and error estimates by the high frequency spectral filter; and

a crossover module configured to mix at least one of the one or more lowpass processed signals and at least one of the one or more highpass processed signals to generate an enhanced voice signal.