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Abstract

A diagnostic apparatus includes an excitation unit, a first sound reception unit, a second sound reception unit, and a processor. The processor designates a plurality of various volumes for the excitation unit. The processor calculates a first reference impulse response, a second reference impulse response, a first evaluation impulse response, and a second evaluation impulse response. The processor calculates a correlation transfer function. The processor calculates a difference between a first evaluation characteristic and a first reference characteristic. The processor diagnoses a measurement object based on the difference and a characteristic that a volume of a vibration radiation sound shifts from a dead zone to a rise region to a linear region to a saturation zone in this order as a volume of the excitation sound changes.

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First Claim