This paper describes a three ring microphone array estimates the horizontal/vertical direction and distance of sound sources and separates multiple sound sources for mobile robot audition. Arrangement of microphones is simulated and an optimized pattern which has three rings is implemented with 32 microphones. Sound localization and separation are achieved by Delay and Sum Beam Forming(DSBF) and Frequency Band Selection(FBS). From on-line experiments results of sound horizontal and verticle localization, we confirmed that one or two sounds sources could be localized with an error of about 5 degrees and 200 to 300mm in the case of the distance of about 1m. The off-line experiments of sound separation were evaluated by power spectrums in each frequency of separated sounds, and we confirmed that an appropriate frequency band could be selected by DSBF and FBS. The system can separate 3 different pressure speech sources without drowning out.

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