ifficulties of determining the in- levels of the components; owing to the phenomenon tensity levels at the largest distances in the presence of known as "masking", certain of the components will a high-background noise level would be considerable. contribute more to the total loudness level than… … 20 100 500 1,000 5,000 10,000 It is seen that at 32 feet the observed values are higher Frequency in cyc/es per second than the calculated values; that at 80 feet and 200 feet Figure 7.—Loudness-level contours for pure tones. (Reprinted from reference 7.) the agreement is good; and that at the two…
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