Comparison between SFTs with window tail sizes 1024 and 1024
Overview
I created SFTs for the same 1800-second segment using window sizes 1024.
One SFT had no line suppressed. Another had the following lines suppressed:
- 41.25 Hz all harmonics
- 59.95 - 60.05 Hz all harmonics
- 151.30 Hz all harmonics
- 973.30 Hz all harmonics
- 1442.00 Hz all harmonics
The power plots describe the difference between power computed from SFT coefficients.
The SFT plots describe the distance between two coefficients as complex numbers.
Two flavors of plots are available for comparison:
- "Absolute" plots are distance between these two numbers, as is.
- Relative plots divide the value by the value of power (or square root of it, as appropriate)
computed using data for SFT with Direchlet kernel size 64.
All plots are logarithmic.
Power
|
Entire file
|
| Absolute |
Relative |
|
|
150 Hz - 1000 Hz
|
| Absolute |
Relative |
|
|
650 Hz - 670 Hz
|
| Absolute |
Relative |
|
|
200 Hz - 400 Hz
|
| Absolute |
Relative |
|
|
240 Hz - 270 Hz
|
| Absolute |
Relative |
|
|
250 Hz - 255 Hz
|
| Absolute |
Relative |
|
|
251.25 Hz - 251.35 Hz
|
| Absolute |
Relative |
|
|
263 Hz - 263.1 Hz
|
| Absolute |
Relative |
|
|
SFT
|
Entire file
|
| Absolute |
Relative |
|
|
150 Hz - 1000 Hz
|
| Absolute |
Relative |
|
|
650 Hz - 670 Hz
|
| Absolute |
Relative |
|
|
200 Hz - 400 Hz
|
| Absolute |
Relative |
|
|
240 Hz - 270 Hz
|
| Absolute |
Relative |
|
|
250 Hz - 255 Hz
|
| Absolute |
Relative |
|
|
251.25 Hz - 251.35 Hz
|
| Absolute |
Relative |
|
|
263 Hz - 263.1 Hz
|
| Absolute |
Relative |
|
|
Power plots for entire spectrum
|
| No lines suppressed |
With line suppression |
|
|