An audio processing device configured to determine presence or absence of abnormality in a speaker (sp1, sp2, sp11, sp12) and a plurality of microphones (mc1-mc6, mc11-mc16), the speaker (sp1, sp2, sp11, sp12) being configured to receive a speaker signal, the plurality of microphones (m1-mc6, mc-11-mc16) being configured to collect the audio output from the speaker (sp1, sp2, sp11, sp12), wherein the audio processing device includes a plurality of first filters (21-26, 121-126), each filter (21-26, 121-126) associated with a corresponding microphone (mc1-mc6, mc11-mc16) of the plurality of microphones (mc1-mc6, mc11-mc16) and configured to pass in a respective first band included in a band of the audio output from the speaker (sp1, sp2, sp11, sp12), a plurality of first delayers (31-33, 34-36), each delayer (31-33, 34-36) associated with a corresponding filter (21-26, 121-126) from the plurality of filters (21-26, 121-126) and configured to delay the audio signal passed through the corresponding filter (21-26, 121-126) of the plurality of first filters (21-26, 121-126) by a respective delay time (τ different from delay times (τ of others of the plurality of first delayers (31-33, 34-36), and a first adder configured to add the audio signals output from the plurality of first delayers (31-33, 34-36), a first correlation value calculator configured to calculate correlation values of the signal output from the adder and the speaker signal for each timing according to the delay times (τ) of the plurality of first delayers (31-33, 34-36), wherein a determinator determines the presence or the absence of abnormality in the plurality of microphones (mc1-mc6, mc11-mc16) and the speaker (sp1, sp2, sp11, sp12) based on the calculated correlation values. the speaker (sp1, sp2, sp11, sp12) being configured to receive a speaker signal, the plurality of microphones (m1-mc6, mc-11-mc16) being configured to collect the audio output from the speaker (sp1, sp2, sp11, sp12), wherein the audio processing device includes a plurality of first filters (21-26, 121-126), each filter (21-26, 121-126) associated with a corresponding microphone (mc1-mc6, mc11-mc16) of the plurality of microphones (mc1-mc6, mc11-mc16) and configured to pass in a respective first band included in a band of the audio output from the speaker (sp1, sp2, sp11, sp12), a plurality of first delayers (31-33, 34-36), each delayer (31-33, 34-36) associated with a corresponding filter (21-26, 121-126) from the plurality of filters (21-26, 121-126) and configured to delay the audio signal passed through the corresponding filter (21-26, 121-126) of the plurality of first filters (21-26, 121-126) by a respective delay time (τ different from delay times (τ of others of the plurality of first delayers (31-33, 34-36), and a first adder configured to add the audio signals output from the plurality of first delayers (31-33, 34-36), a first correlation value calculator configured to calculate correlation values of the signal output from the adder and the speaker signal for each timing according to the delay times (τ) of the plurality of first delayers (31-33, 34-36), wherein a determinator determines the presence or the absence of abnormality in the plurality of microphones (mc1-mc6, mc11-mc16) and the speaker (sp1, sp2, sp11, sp12) based on the calculated correlation values. <EOS>