Abstract
It has been noted that among the tones of a musical instrument, the same loudness does not always produce the same values of sound level measured in dBA. Therefore, the values of the readings were studied for musical tones of various pitch which had been heard to be the same in loudness. The piano, trombone, violin and some other instruments were chosen as examples. The level indicators used in the experiment were as follows: a VU‐meter, a precision sound level meter (fast. impulse) (A,B,C,D) and a high‐speed level recorder (A, B, C, D). The results show that it is not easy to find a suitable and simple level indicator for our purpose. In the case of the piano, for instance, the readings in dBD are closer to the loudness than are those in dBA, but there is still a noticeable discrepancy. To alleviate this problem, a diagram of values is presented—as a temporary means—which may be added to the dBC reading to obtain a reconciliation of perceived and measured sound. This diagram is specific to each pitch and musical instrument.
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