Timeline for FIR Filter Design: Window vs Parks McClellan and Least Squares
Current License: CC BY-SA 3.0
4 events
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| Jul 6, 2017 at 10:43 | comment | added | Olli Niemitalo |
We talked about Parks–McClellan pre and post echo on comp.dsp in 2003. Alexey Lukin posted a minimal MATLAB example: f=[0 0.49 0.51 1]; a=[1 1 0 0]; b=remez(300,f,a), which also runs in Octave. An explanation is that with very steep filters the ripples may be regular enough to resemble a cosine. The time domain equivalent of the frequency domain cosine would be the two impulsive echos.
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| Feb 18, 2017 at 21:22 | history | edited | hotpaw2 | CC BY-SA 3.0 |
added 150 characters in body
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| Feb 18, 2017 at 21:22 | comment | added | Dan Boschen | Yes good point @hotpaw2, the passband ripple leads to intersymbol interference (trailing and leading echos). Thanks | |
| Feb 18, 2017 at 21:18 | history | answered | hotpaw2 | CC BY-SA 3.0 |