equal-loudness contour
Sign in to savefrequency characteristics of hearing and perceived volume
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ISO 0070
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ISO 31
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WS-Addressing
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digital object identifier
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International Standard Serial Number
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hertz
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ISO/IEC 8859
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A-weighting
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ear
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HTML
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sound
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International Standard Book Number
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Q2407
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frequency
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ISO 3166-1
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Wayback Machine
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Q2370
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pinyin
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ISO 639
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International Organization for Standardization
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