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Old 16th January 2006, 09:56 AM   #1
nbcd is offline nbcd  Romania
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Default 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.
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Old 16th January 2006, 10:10 AM   #2
peranders is offline peranders  Sweden
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100dB
It means probably that the noise and distortion level is 100 dB under full output voltage (0.001%).
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Old 16th January 2006, 07:57 PM   #3
myhrrhleine is offline myhrrhleine  Belize
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>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.
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Old 16th January 2006, 08:06 PM   #4
jacco vermeulen is offline jacco vermeulen  Netherlands
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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

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Old 17th January 2006, 08:44 AM   #5
AndrewT is offline AndrewT  Scotland
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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.
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Old 17th January 2006, 08:53 AM   #6
jacco vermeulen is offline jacco vermeulen  Netherlands
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www.ex.ac.uk/cimt/dictunit/dictunit.htm#prefixes
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