Sound emission and collection device, and sound emission and collection method

A sound emission and collection device comprising:

• a speaker;
• a filter configured to process a sound emission signal serving as a sound signal to be supplied to the speaker;
• a plurality of microphones;
• a plurality of echo cancellers respectively corresponding in number to the plurality of microphones and configured to cancel regression sound signals of sound emitted by the speaker from sound collection signals output by the corresponding microphones;
• a first integration section configured to integrate adaptive filter coefficients obtained from the plurality of echo cancellers;
• a reverberation time estimation section configured to estimate a reverberation time for each frequency band in a space where the speaker and the plurality of microphones are present based on the integrated adaptive filter coefficients;
• and
• an arithmetic operation section configured to specify a frequency band having a long reverberation time from the sound emission signal based on the estimated reverberation time, to calculate a filter coefficient for suppressing power of the specified frequency band, and to set the filter coefficient to the filter.