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#401 |
diyAudio Member
Join Date: Dec 2015
Location: south east asia
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20 samples didn't make anything better, the image is at -28db. It looks the 30 samples is the best.
20samples.JPG |
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#402 |
diyAudio Member
Join Date: Mar 2005
Location: Blaricum
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With 30 point plus sophisticated post interpolation you have found a very nice optimum.
You can’t escape physics, when you improve on one aspect, you wil lose somewhere else. Hans |
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#403 |
diyAudio Member
Join Date: Dec 2015
Location: south east asia
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I will try to interpolate the midpoints of the derivatives, by this the sinc ringingings get subjected to delta sigma filter. After all I am interpolating the cubic spline of the derivatives and no more that of the data.
I will also use the heterodyne to add instead of filtering the 68k-88khz images. There is still lot to do. |
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#404 |
diyAudio Member
Join Date: Mar 2005
Location: Blaricum
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I tried a 36point Blackman Harris window while not using the outer 4 points because they were practically zero, so filter length stayed still the same as before.
Below, at the left Blackman Harris in Red t and the Hamming with 0,45% gain at the right in Blue. FR is now a bit smoother around 20Khz, but stopband is much deeper that the Hamming window with 0,45% gain. Suppression at 24.1Khz is a bit less, but to be realistic, at this frequency the spectral content of music is quite a bit lower, see second image. Hans . |
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