The present study examined three factors and their interactions which make us feel a voice-recognition system is inconvenient as a device for sending information: sending unit, accuracy of recognition per unit, and response time per unit. The main results were as follows: (1) All three factors influenced feelings of the inconvenience of a voice recognition system. (2) Sending tasks even with the smallest unit such as monosyllable do not cause feelings of inconvenience when recognition accuracy is high (95% or 100%) and response occurs almost in real time. (3) Recognition accuracy and response time cannot compensate for each other to reduce feelings of inconvenience.
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