Date:2010-12-01 14:30:02 (8 years 11 months ago)
Author:Werner Almesberger
Commit:fea4ee551a27612c3b481198c12aaf0b8cd3eec5
Message:usrp/README: change threshold to avoid making section reference look like a typo

- usrp/README: changed threshold from 50 to 60, such that the reference
"5)" right next to it doesn't look like a mistyped "50"
Files: usrp/README (3 diffs)

Change Details

usrp/README
102102   This noise floor value is used to filter uninteresting samples later
103103   on, removing a constant bias from the results.
104104
105   In this example, we'll use a noise floor value of -50 dB.
105   In this example, we'll use a noise floor value of -60 dB.
106106
1071076) Determine the "interesting" frequency range. For this, we consider all
108108   the spectra of the measurements:
...... 
129129
1301307) Obtain the peaks from all measurements
131131
132   gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done" \
132   gnuplot> plot "<for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done" \
133133     with lines
134134                                                   ^ ^ ^ ^
135135                                                   | | | |
...... 
142142
1431438) The final result for one measurement run can be obtained as follows:
144144
145   for n in 100/tmp*; do ./fft -s 100 0 20 50 <$n;done | ./range -v 2
145   for n in 100/tmp*; do ./fft -s 100 0 20 60 <$n;done | ./range -v 2
146146
147147   In this example, "range" eliminates all outliers more than 2 dB from
148148   the average and reports this.

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