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nbcd 16th January 2006 09:56 AM

100dB
 
hy all.
Can someone please explain me what it means this -100dB inscription on my sound card? I know that dB is a measure unit for noise but why is it negative.

thanks.
Best regards!

peranders 16th January 2006 10:10 AM

It means probably that the noise and distortion level is 100 dB under full output voltage (0.001%).

myhrrhleine 16th January 2006 07:57 PM

>I know that dB is a measure unit for noise.

Actually, dB refers to a power ratio, logarithmically expressed.
It compares one thing to another.

In this case a minus would indicate that something is 100dB less than something else.

jacco vermeulen 16th January 2006 08:06 PM

Quote:

Originally posted by myhrrhleine
Actually, dB refers to a power ratio, logarithmically expressed.
It compares one thing to another.

Aaah, i get it !
You mean 20Log( 1/ 100.000 )= -100dB

Welcome, Lady Merlin.

AndrewT 17th January 2006 08:44 AM

I do hate the confusion caused by the difference in the British and continental way of using , & . to indicate the decimal point and grouping large numbers into 10^3.

100,000.0 (GB) = 100.000,0 (Rotterdam) =10^5(unconventional but understood)

Give us a solution that works world wide.

No, don't suggest we revert to imperial measure (using 1/12, ounces and pints) to match the old fogies across the pond.

jacco vermeulen 17th January 2006 08:53 AM

www.ex.ac.uk/cimt/dictunit/dictunit.htm#prefixes


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