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This work describes real-time 2 dimensional sound source localization in an ordinary environment, using a 128-channel huge microphone array. Sound source localization by our microphone array is achieved by the sum and delay beam former (SDBF). A dedicated pci 128-channel simultaneous input analog-to-digital (AD) board with a 5 μs DMA transfer was developed for a 128-channel microphone array. Sampling frequency of this microphone array is 11 kHz. In order to keep a fixed cycle such as 11 kHz, "ART-Linux" is used. A sound source can be localized in the range of about ±10 cm error. It takes about 1 s to localize a sound source. Sound source localization by our 128-channel huge microphone array is evaluated by sound pressure distribution. Moreover, our microphone array can be used in order to separate multiple sound sources, reflection and reverberation. Our microphone array is used as an application of a robotics room for human behavior analysis from results of sound source localization and separation etc.