Speech processing device and speech processing method

A speech processing device connectable to a plurality of microphones disposed in a closed space, the speech processing device comprising:

• a processor;
• and
• a memory having instructions that, when executed by the processor, cause the processor to perform operations comprising:
• detecting a single-talk state based on a speech signal collected by each of the plurality of microphones, the single-talk state in which any one of a plurality of persons present in the closed space speaks, the plurality of persons comprising a main speaking person;
• estimating a mixing rate indicating a ratio of a speech signal of the main speaking person to a speech signal of another person other than the main speaking person based on a first sound pressure ratio and a second sound pressure ratio, the first sound pressure ratio indicating a sound pressure ratio of the speech signals collected by the plurality of microphones in the single-talk state of the main speaking person, the second sound pressure ratio indicating a sound pressure ratio of the speech signals collected by the plurality of microphones in the single-talk state of the another person;
• and
• determining whether suppression of a crosstalk component due to speaking of the another person contained in the speech signal of the main speaking person is necessary based on an estimation result of the mixing rate.