one of these days.....
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Re: one of these days.....
decibel
Unit of measure used originally to compare sound intensities and subsequently electrical or electronic power outputs; now also used to compare voltages. A whisper has a sound intensity of 20 dB; 140 dB (a jet aircraft taking off nearby) is the threshold of pain.
An increase of 10 dB is equivalent to a tenfold increase in intensity or power. The decibel scale is used for audibility measurements, as one decibel, representing an increase of about 25%, is about the smallest change the human ear can detect.
The difference in decibels between two levels of intensity (or power) L1 and L2 is 10 log10(L1/L 2); a difference of 1 dB thus corresponds to a level of 100.1, which is about 1.026.
Decibel measurements of noise are often ‘A-weighted’ to take into account the fact that some sound wavelengths are perceived as being particularly loud. Typical sound levels in dBA are: pneumatic drill at 1 m/3 ft, 120 dBA; normal conversation, 70 dBA; and limit of audibility, 10 dBA.
omg i can google
Unit of measure used originally to compare sound intensities and subsequently electrical or electronic power outputs; now also used to compare voltages. A whisper has a sound intensity of 20 dB; 140 dB (a jet aircraft taking off nearby) is the threshold of pain.
An increase of 10 dB is equivalent to a tenfold increase in intensity or power. The decibel scale is used for audibility measurements, as one decibel, representing an increase of about 25%, is about the smallest change the human ear can detect.
The difference in decibels between two levels of intensity (or power) L1 and L2 is 10 log10(L1/L 2); a difference of 1 dB thus corresponds to a level of 100.1, which is about 1.026.
Decibel measurements of noise are often ‘A-weighted’ to take into account the fact that some sound wavelengths are perceived as being particularly loud. Typical sound levels in dBA are: pneumatic drill at 1 m/3 ft, 120 dBA; normal conversation, 70 dBA; and limit of audibility, 10 dBA.
omg i can google
Re: one of these days.....
you think we didn't know that already?
In my life
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
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Re: one of these days.....
not really. the wikipedia page is much better.
In my life
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
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- Posts: 146
- Joined: Thu Feb 12, 2009 7:34 pm
Re: one of these days.....
Tone Deft wrote:not really. the wikipedia page is much better.
http://www.amazon.com/Sound-Reproductio ... 921&sr=1-4
cant find the book i have, i think it's too old
but that one will do, lets all order, amazon will not know whats going on!
Re: one of these days.....
(Power ratio)dB = 10*log(P1/P0) = 10*log(2P0/P0) = 10*log(2) = ~3dB
For P proportional to A^2, where P=Power, A=Amplitude:
(Power ratio)dB = 10*log(P1/P0) = 10*log(A1^2/A0^2) = 2*10*log(A1/A0) = 20*log(2*A0/A0) = 20*log(2) = ~6dB
For P proportional to A^2, where P=Power, A=Amplitude:
(Power ratio)dB = 10*log(P1/P0) = 10*log(A1^2/A0^2) = 2*10*log(A1/A0) = 20*log(2*A0/A0) = 20*log(2) = ~6dB
Re: one of these days.....
Wow. Way down the page now. Spent too much time looking for typos in my response 'preview'. Anyways.Nogi wrote:(Power ratio)dB = 10*log(P1/P0) = 10*log(2P0/P0) = 10*log(2) = ~3dB
For P proportional to A^2, where P=Power, A=Amplitude:
(Power ratio)dB = 10*log(P1/P0) = 10*log(A1^2/A0^2) = 2*10*log(A1/A0) = 20*log(2*A0/A0) = 20*log(2) = ~6dB
Re: one of these days.....
cut to the chase
http://en.wikipedia.org/wiki/Sound_pressure_level
SPL measurements use the 20*log(gain)
http://en.wikipedia.org/wiki/Sound_pressure_level
SPL measurements use the 20*log(gain)
In my life
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Re: one of these days.....
I will gladly trade the trials of my day job for this problem. PM if interested.
Oh class warfare.
Oh class warfare.
Re: one of these days.....
huh?
In my life
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Why do I smile
At people who I'd much rather kick in the eye?
-Moz
Re: one of these days.....
leonard wrote:
xxxx theatre, bloody yobbo's, i'm not surprised.
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- Location: Seattle
Re: one of these days.....
They moved in next to the bar, not the other way around. I'm a little touchy about this personally as Broadway/Capital Hill district in Seattle has been gutted of cool record stores, clubs etc. in favor of condos. The yuppies move in to 'cool' neighborhoods for the vibe, and slowly eliminate everything interesting or unique about the neighborhood. Happens over and over again. If there was a legitimate housing shortage in Seattle sure, but there isn't.Tone Deft wrote:yeah, put people out of their homes so you can use the space one night a week.Johnisfaster wrote:so there was this great little bar that did shows for years and years. right next door this big building gets built with expensive lofts for sale. people start buying up the lofts next to the loud little bar that was already there. people then complain to the authorities about the loud little bar THAT WAS THERE FIRST. bar has legal battles that are costly, in the end they put up a sound dampening blanket at the front door and can only have quieter acts play.
bull f***ing shit if you ask me.
the world makes me very angry sometimes.
homes are more worthwhile than clubs.
Honestly it kind of made me ill to see the Mission turning into hipster/yuppie chic and becoming less hispanic, but that's life.
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Re: one of these days.....
no,Machinesworking wrote: Honestly it kind of made me ill to see the Mission turning into hipster/yuppie chic and becoming less hispanic, but that's life.
its gentrification:
http://en.wikipedia.org/wiki/Gentrification
and it sucks,
303
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Re: one of these days.....
hmmmm it's all getting a bit nerdy in here.
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Re: one of these days.....
smartass303 wrote:no,Machinesworking wrote: Honestly it kind of made me ill to see the Mission turning into hipster/yuppie chic and becoming less hispanic, but that's life.
its gentrification:
http://en.wikipedia.org/wiki/Gentrification
and it sucks,
303
explain to me how this sucks worse than living in a GOOD neighborhood that slowly goes to shit as property values decrease and crime goes up?
gentrification: better property values and less crime, oh no!