Sound quality is used as the suitability of the sound emitted by a machine, depending on the characteristics of that sound and the perceptual sensation received that reflects the degree of acceptance of the machine by the user. In order to evaluate the sound quality of the grinders under study, binaural recordings are requiered of the emitted sounds to determine the objective psychoacoustic parameters, and then, to make subjective tests to a representative number of people about the impression made by that particular sound.
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