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This paper describes recent research and development activities on robust ASR (automatic speech recognition) in NTT Human Interface Laboratories. ASR system design has been changing from the experimental to the commercial level. A relevant issue in achieving practical ASR is robustness against environmental noise and speaker/circuit differences. Adaptation techniques have been widely investigated for improving the robustness. Real time speaker/noise tiaptation is getting more and more popular.doi:10.1121/1.421586 fatcat:c7b5lxorwngxljkzcskshghkiq