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Rikiki (![[info]](http://www.journalfen.net/img/userinfo.gif){kind=small} rikiki) wrote,@ 2008-10-28 09:42:00 |
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- decibel -
- log(x)=y
- 10^y=x
- lowest sound human ear can hear - 1/trillionth acoustic Watt
- loudest - 1 acoustic Watt - threshold of pain - dB=10log(1,000,000,000,000) = 120 dB greater than threshold of hearing
- notation for levels of relative power of sound in base ten
- dB=10log (P1/P0)
- unit of relative power - bel
- Hz - cycles per second, representation of frequencies
- speed of sound - 1180 ft/sec at sea level
- surround sound
- 5.1 - six speakers - (L)(C)(sub)(R)
- (BL) (BR)
- 7.1 - 8 speakers - add (ML) & (MR)
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