Re: Linear to log channel conversion...Help
BIGOS@Darwin.Stanford.EDU
Fri, 06 Sep 1996 16:53:20 +0000 (PDST)
Linear to log conversion:
Ch = (ch_dec)Log(S/k)
where
Ch = observed channel
ch_dec = # of channels in one decade
S is origional signal
k is a scaling factor (arbitrary)
Solve for S:
S = k * 10 **(Ch/ch-dec)
For four decades and 0-1023 channels,
ch-dec = 256
If k = 1, signal range is 1 - 10000,
For a different signal range, choose a different k.
Of course, this all depends on the log amp being four
decades and having a true log character.
-Marty Bigos
Stanford Shared FACS Facility
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