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<blockquote data-quote="theCybe" data-source="post: 2733969" data-attributes="member: 558105">The filters used for dBA and dBC<ul>
<li data-xf-list-type="ul">The most widely used sound level filter is the A scale, which roughly corresponds to the inverse of the 40 dB (at 1 kHz) equal-loudness curve. Using this filter, the sound level meter is thus less sensitive to very high and very low frequencies. Measurements made on this scale are expressed as dBA. The C scale is practically linear over several octaves and is thus suitable for subjective measurements only for very high sound levels. Measurements made on this scale are expressed as dBC. There is also a (rarely used) B weighting scale, intermediate between A and C. The figure below shows the response of the A filter (left) and C filter, with gains in dB given with respect to 1 kHz. (For an introduction to filters, see <a href="http://www.phys.unsw.edu.au/~jw/RCfilters.html" target="_blank">RC filters, integrators and differentiators</a>.)</li>
</ul><img src="http://www.phys.unsw.edu.au/jw/graphics/dBA&amp;amp;C.GIF" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="theCybe, post: 2733969, member: 558105"] [B]The filters used for dBA and dBC[/B] [LIST][*]The most widely used sound level filter is the A scale, which roughly corresponds to the inverse of the 40 dB (at 1 kHz) equal-loudness curve. Using this filter, the sound level meter is thus less sensitive to very high and very low frequencies. Measurements made on this scale are expressed as dBA. The C scale is practically linear over several octaves and is thus suitable for subjective measurements only for very high sound levels. Measurements made on this scale are expressed as dBC. There is also a (rarely used) B weighting scale, intermediate between A and C. The figure below shows the response of the A filter (left) and C filter, with gains in dB given with respect to 1 kHz. (For an introduction to filters, see [URL="http://www.phys.unsw.edu.au/~jw/RCfilters.html"][COLOR=#0000ff]RC filters, integrators and differentiators[/COLOR][/URL].) [/LIST] [IMG]http://www.phys.unsw.edu.au/jw/graphics/dBA&C.GIF[/IMG] [/QUOTE]

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