Acoustic crosstalk suppression device and acoustic crosstalk suppression method

An acoustic crosstalk suppression method executed by an acoustic crosstalk suppression device, the acoustic crosstalk suppression method comprising:

• estimating a main speaker in a closed space based on voice signals collected by n units of microphones arranged in the closed space corresponding to n number of persons, n being an integer equal to or larger than 3;
• updating, by each of n units of filter update units, a parameter of a filter that generates a suppression signal of a crosstalk component caused by utterance of another speaker and included in a voice signal of the main speaker, and storing, by each of the n units of the filter update units, an update result of the parameter of the filter for suppressing the crosstalk component therein,
• suppressing the crosstalk component included in the voice signal of the main speaker by using a synthesis suppression signal based on first suppression signals generated by a maximum of n-1 units of the filter update units corresponding to reference signals collected by a maximum of n-1 units of the microphones other than a microphone corresponding to the main speaker;
• estimating a suppression amount of the crosstalk component;
• and
• replacing a first combination of the reference signals used to generate the synthesis suppression signal with a second combination of other reference signals in a case where the suppression amount is equal to or smaller than a first threshold,
• wherein the filter update units corresponding to the other reference signals after the replacing regenerate second suppression signals based on an input of the other reference signals.

An acoustic crosstalk suppression device, comprising:

• a processor;
• and
• a memory including a program that, when executed by the processor, causes the processor to perform processing, the processing including:
• estimating a main speaker in a closed space based on voice signals collected by n units of microphones arranged in the closed space corresponding to n number of persons, n being an integer equal to or larger than 3;
• generating, via n units of filters, a suppression signal of a crosstalk component caused by utterance of another speaker and included in a voice signal of the main speaker, and updating, for each filter, a parameter of the filter for suppressing the crosstalk component to store an update result of the parameter of the filter;
• suppressing the crosstalk component included in the voice signal of the main speaker by using a synthesis suppression signal based on first suppression signals generated by a maximum of n-1 units of the filters corresponding to reference signals collected by a maximum of n-1 units of the microphones other than a microphone corresponding to the main speaker;
• estimating a suppression amount of the crosstalk component;
• and
• replacing a first combination of the reference signals used to generate the synthesis suppression signal with a second combination of other reference signals in a case where the suppression amount is equal to or smaller than a first threshold,
• wherein the filters corresponding to the other reference signals after replacement regenerate second suppression signals based on an input of the other reference signals.