Jim P email (remove spam text)
Correction on the last formula:
Voltage ratio: 20 * log_sub_base10 (V1/V2) = dB
----- Original Message -----
From: Jim P <dallas.net> jvpoll
To: <MITVMA.MIT.EDU> PICLIST
Sent: Saturday, May 27, 2000 1:36 PM
Subject: Re: [PIC]: Audio Ideas?
Oops! Did anyone else catch this?
"of the converted result to drive one of the LED's (each
LED would then represent a factor of 2 (I think that is 3 dB!)."
- S/B "6" dB
(Not meaning to beat a dead horse or anything - but here's
a quick review of the dB anyway ...)
Voltage factor of 2 = 6 dB
Voltage factor of 1.414 = 3 dB
Power ratio of 2 = 3 dB
Power ratio of 4 = 6 dB
Power ratio: 10 * log_sub_base10 (P1/P2) = dB
Voltage ratio: 20 * log_sub_base10 (P1/P2) = dB
See also: www.piclist.com/techref/microchip/ios.htm?key=audio
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