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In many cases when sound absorptive treatment has been applied to rooms, the effective noise reduction has been found larger than that predicted by the conventional formula. It is shown that this discrepancy appears in cases where conversational noise is predominant, and that it is the result of a phenomenon which may be termed “psychological feedback,” which increases the conversational noise reduction (expressed in decibels) by a factor of about 1.6.
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Tadeusz Korn (1954) studied this question.
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