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We describe a new real-time isolated word recognizer with improved user interface. The recognizer is designed for an Extension Number Guidance System which looks up and announces an extension number by telephone dialogue with users. To deal with telephone quality speech input which include noise and distortion during transmission over the telephone network, we developed feature extraction and a word detection algorithm. These techniques use wide band-pass filter outputs which are generallydoi:10.1250/ast.15.87 fatcat:2rkxka4ktnfbdjwoz5maqctf6e