Late reverberation reduction and blind reverberation time measurement for automatic speech recognition

Development of automatic speech recognition (ASR) systems robust to late reverberation action is urgent task. It is well known that a late reverberation reduction algorithm used as ASR pre-processor demands prior estimation of reverberation time. Blind reverberation time measurements are less accurate than ones for known room impulse response (RIR) direct measurements. As result, it is naturally expect that ASR accuracy for blind reverberation time estimation will be lower than one for direct estimation technique. Unfortunately, it is difficult find information on the recognition accuracy loss in literature. In this paper, attempt to eliminate this gap is realized, and conditions of minimizing the loss by it reducing to 3-5% are specified.