APPARATUS AND METHOD FOR EVALUATION OF SOUND AS WELL AS RECORDING MEDIUM WITH STORED PROGRAM FOR SOUND EVALUATION

PROBLEM TO BE SOLVED: To stably evaluate the existence and the extent of problem sounds generated intermittently due to rotation operation. SOLUTION: A signal processing means 6 is provided with a by-unit-angle sound data extraction part 14, in which a prescribed unit angle width to be used as the minimum unit of an angle of rotation, dividing one prescribed cycle of an object to be evaluated, on the basis of timing data is calculated on the basis of the timing data and in which sound data is fetched in every unit angle width. The means 6 is provided with a feature-value calculation part 17, in which a feature value with reference to the sound data covering one cycle portion about by-unit-angle sound data extracted by the sound data extraction part 14 is calculated at every unit angle. The means 6 is provided with an angle-axis-data generating part 18, in which feature-value data calculated by the calculation part 17 is generated as angle axis data which uses an angle change in one cycle as an axis.