US Patent 10096330 Utterance condition determination apparatus and method

An utterance condition determination device includes a memory configured to a voice signal of a first speaker and a voice signal of a second speaker, and a processor configured to estimate an average backchannel frequency that represents a backchannel frequency of the second speaker in a period of time from a voice start time of the voice signal of the second speaker to a predetermined time based on the voice signal of the first speaker and the voice signal of the second speaker, to calculate the backchannel frequency of the second speaker for each unit of time based on the voice signal of the first speaker and the voice signal of the second speaker, and to determine a satisfaction level of the second speaker based on the estimated average backchannel frequency and the calculated backchannel frequency.