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usrp/README: change threshold to avoid making section reference look like a typo

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- usrp/README: changed threshold from 50 to 60, such that the reference
  "5)" right next to it doesn't look like a mistyped "50"
This commit is contained in:
Werner Almesberger 2010-12-01 10:30:02 -03:00
parent 23c37261b7
commit fea4ee551a
1 changed files with 3 additions and 3 deletions
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usrp/README
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@ -102,7 +102,7 @@ contamination from other sources.
This noise floor value is used to filter uninteresting samples later This noise floor value is used to filter uninteresting samples later
on, removing a constant bias from the results. on, removing a constant bias from the results.
In this example, we'll use a noise floor value of -50 dB. In this example, we'll use a noise floor value of -60 dB.
6) Determine the "interesting" frequency range. For this, we consider all 6) Determine the "interesting" frequency range. For this, we consider all
the spectra of the measurements: the spectra of the measurements:
@ -129,7 +129,7 @@ contamination from other sources.
7) Obtain the peaks from all measurements 7) Obtain the peaks from all measurements
gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done" \ gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done" \
with lines with lines
^ ^ ^ ^ ^ ^ ^ ^
| | | | | | | |
@ -142,7 +142,7 @@ contamination from other sources.
8) The final result for one measurement run can be obtained as follows: 8) The final result for one measurement run can be obtained as follows:
for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done | ./range -v 2 for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done | ./range -v 2
In this example, "range" eliminates all outliers more than 2 dB from In this example, "range" eliminates all outliers more than 2 dB from
the average and reports this. the average and reports this.