| FF | [Filter - Fourier] |
| FQ | [Filter - Quick Fourier, High, low pass, etc., Padded ||] |
| RC | [Real Convolution ||] |
.PLOT X-DIMENSION:
[Enter vertical length of the plot.]
.(L)OWPASS, (H)IGHPASS, OR (B)ANDPASS? (L/H/B):
[Enter type of the filter to be plotted]
.FERMI CUTOFF RADIUS, TEMP. FACTOR:
[Enter cutoff frequency and temperature factor.]
.FERMI CUTOFF RADIUS.,TEMP.FACTOR:
[Enter cutoff frequency and temperature factor for the second
cutoff.]
.PLOT X-DIMENSION:
[Enter vertical length of the plot.]
.(L)OWPASS, (H)IGHPASS, OR (B)ANDPASS? (L/H/B): B
[Enter type of the filter to be plotted]
.RADIUS:
[Enter cutoff frequency]
.(M)ULTIPLICATIVE, (A)DDITIVE:
[Enter type of the filter.]
.PLOT X-DIMENSION:
[Enter vertical length of the plot.]
.(L)OWPASS, (H)IGHPASS (L/H):
[Enter type of the filter to be plotted.]
.PASS-BAND AND STOP-BAND FREQUENCY:
[Enter the two frequencies.]
.LIKE AN EXAMPLE WITH STEP FUNCTION??(Y/N):
[If answer is "Y" then it gives the plot of a step function
and how it looks like when it is filtered using the
Butterworth filter with the given parameters.
NOTE: This currently works only for dimension (of plot)
equal to powers of two only.
If answer is "N" then you are back to operation command].
.IMPULSE RESPONSE LENGTH: 17
[Enter the impulse response length. It should be odd, not larger
then 59, and never larger than the actual size of Fourier space
filter or smaller than 3.]
.NUMBER OF BANDS: 3
[Enter the number of pass- or stop- bands in freq. space
for a filter to be designed (at least 2).]
.BAND # i - LOWER AND UPPER EDGES: 0.1,0.14
[Enter the edges boundaries for each band.]
.BAND # i - DESIRED VALUE: 2.3
[Enter the desired filter for each band (e.g. 0.0 or 0.5 or
1.0 or 3.0).]
.BAND # i - WEIGHTING: 1
[Enter the weight for each band; this specifies the relative
error of approximation allowed in a given band]
.PLOT FREQUENCY RESPONSE (Y/N): Y
[Enter 'Y' if you want the plot of frequency response]
.DO YOU LIKE YOUR FILTER (Y/N): Y
[Enter 'Y' if you are satisfied with approximation obtained.
Otherwise you go back to the first step.]
.FILTER FILE: FIL001
[Enter name of file where filter is to be stored.]
.FILTER DIMENSIONS (NX,NY): 128,64
[Enter dimensions of resulting filter in Fourier space.
If 0 then PSF is stored to be subsequently used in
'RC' operation for real space filtering.]
.NUMBER OF SLICES (NZ): 32
[Enter number of slices for 3-D filter file. If 0 then a 2-D
filter is produced, if >0 then a 3-D filter.]
.PRODUCE 2-D OR 3-D PSF (2/3)?: 3
[Enter 2 or 3, and the file containing Point Spread Function
of the appropriate dimensions is stored (to be used for
filtering with RC).
NOTES