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Clarify the term(a wighted)checking adc/dac dynamics specs.

tango

New Member
Can somone fill us with the difference between an aweighted and none a wighted dynamics #'s when checking adc/dac specs?And may be fill us in a bit in details the measuring process?the difference?

thabks guys.
 

cAPSLOCK

Active Member
A weighted measurements (i think...) take into account the lesser sensativity of the human ear to low frequencies. It is a sort of psychoacoustic model of what we percieve as 'flat'. Non weighted is just that... true flat.

With converters the spec is usually used when talkking about dynamic range. A non weighted number would be higher (I MEANT LOWER when I typed this but my fingers and my brain went different directions. After checking my amateur explaination against Joe's good one, I saw the error ;) ). It's either a matter of science or marketing depending on how paranoid you are. Obviously converters with better dynamic range will produce better recordings when they are used in situationwhere the low level detail is critical like classical, or solo instruments.

When it comes to rock/pop and the like, the end mastering procedures will likely remove and dynamic range benefit, and in this case S/N is maybe a more important number.

Of course there are people here that know lots more about this than me, perhaps one will correct any of my misconceptions.

cAPS
 
A-weighting is a loudness curve that approximates the ear's equal-loudness response at the 40 phon level. It's typically used for noise and dynamic range measurements. Here's a link that shows the response: http://hyperphysics.phy-astr.gsu.edu/hbase/sound/acont.html

In practical terms, A-weighted measurements will be about 3dB better than non-weighted measurements. For example, an A-weighted dynamic range of 120 dB is roughly equivalent to a non-weighted dynamic range of 117 dB.
 
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