Patent ID: 8611556

Claim:
An apparatus, comprising: a signal processing module, configured to calculate one or more differences between one or more signal levels from one or more microphones of a plurality of microphones and further one or more signal levels from one or more selected microphones of said plurality of the microphones, configured to create or update one or more difference histograms corresponding to said one or more of selected microphones using said one or more differences, and further configured to determine a sharpness and a sensitivity difference for each of the one or more difference histograms; and a gain control module, configured to adjust one or more amplifying gains for one or more microphone signals corresponding to said one or more microphones using said sensitivity difference for each of the one or more difference histograms corresponding to one of said one or more microphones, if said sharpness meets a predetermined criterion, for matching sensitivities of said plurality of microphones.