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Choice of sound duration and silent intervals for test and comparison signals in the subjective measurement of loudness level.

To avoid faulty judgments when making subjective loudness‐level measurements of noises, the time function of the 1000‐Hz reference tone should be adjusted, as far as possible, to that of the test noise. For trains of repeated impulsions, it should be arranged to have the same duration of impulsion, the same duration of silence between them, the same repetition rate, and the two signal trains should be presented for the same length of time. For continuous noises, these signals should be presented with the same duration, in the range 250–500 msec and with silent intervals of 500–1000 msec. The loudness level of the 1000‐Hz reference tone when presented in very short bursts is to be modified in accordance with the findings of this paper and these findings should be incorporated in the next issue of ISO recommendation 131.