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A sound having a spectrum evenly and continuously distributed over the audiofrequency band is proposed as a reference sound for subjective noise tests in order to permit of subjective determinations being made in any surroundings instead of only in a heavily damped room as at present. Examples are given. The relation between loudness of a single pure tone and a continuous spectrum sound is given, together with some observations on the relative sensitivity of various parts of the cochlea.
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Frank H. Brittain (1939) studied this question.
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