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| author | Josh Blum <josh@joshknows.com> | 2009-09-02 14:18:28 -0700 |
|---|---|---|
| committer | Josh Blum <josh@joshknows.com> | 2009-09-02 14:18:28 -0700 |
| commit | a70c291e3cd4fc3d51f2eebb6b39cdb9d46862da (patch) | |
| tree | 4daa6284894acfe3ee4f0b3d6fe543d46a569760 /gr-wxgui/src/python/common.py | |
| parent | eb1d1b5cfb474b087d41337356efc0cdb7342f28 (diff) | |
waterfall and fft use a common autoscale function
Diffstat (limited to 'gr-wxgui/src/python/common.py')
| -rw-r--r-- | gr-wxgui/src/python/common.py | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/gr-wxgui/src/python/common.py b/gr-wxgui/src/python/common.py index d555a1f055..9c97ce1eca 100644 --- a/gr-wxgui/src/python/common.py +++ b/gr-wxgui/src/python/common.py @@ -137,6 +137,25 @@ def get_min_max(samples): scale_factor = 3 mean = numpy.average(samples) rms = numpy.max([scale_factor*((numpy.sum((samples-mean)**2)/len(samples))**.5), .1]) - min = mean - rms - max = mean + rms - return min, max + min_val = mean - rms + max_val = mean + rms + return min_val, max_val + +def get_min_max_fft(fft_samps): + """ + Get the minimum and maximum bounds for an array of fft samples. + @param samples the array of real values + @return a tuple of min, max + """ + #get the peak level (max of the samples) + peak_level = numpy.max(fft_samps) + #separate noise samples + noise_samps = numpy.sort(fft_samps)[:len(fft_samps)/2] + #get the noise floor + noise_floor = numpy.average(noise_samps) + #get the noise deviation + noise_dev = numpy.std(noise_samps) + #determine the maximum and minimum levels + max_level = peak_level + min_level = noise_floor - abs(2*noise_dev) + return min_level, max_level |