Hi David,
[EMAIL PROTECTED] (David W. Tamkin) writes:
> 10log(amplitude^2) but didn't know why. So thank you for explaining that
> amplitude=power^.5, Rick.
My pleasure.
> The downside is that 20log(amplitude) was exactly what I had guessed, but
> when I get the amplitude from Exactaudiocopy (which preserves one more deci-
> mal place than Audiograbber), 20 times its common log is always a little
> lower (i.e., a greater negative, father below zero) than the peak amplitude
> reported by Cool Edit in dB when Cool Edit re-examines the .wav that Exact-
> audiocopy saved from the CD track. Sometimes the discrepancy crosses a .1 dB
> boundary, and trusting Exactaudiocopy would lead me to overboost and clip if
> Cool Edit is right, but it's a pain to run Cool Edit on the .wav files, so I
> was hoping to get dependable results from Exactaudiocopy alone.
>
> So which program do I believe?
How about just hedging the Exactaudiocopy's report upwards by 0.5 dB?
You're not going to notice this.
Btw, dB is computed using log base 10, if you use the natural log, you
will need to multiply the result by 0.4343. This would reduce the
difference between what the two programs report to ~0.05 dB.
Rick
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