[newb] eigen3 for FIR filter (convolution)?

Re: [newb] eigen3 for FIR filter (convolution)?

Sat May 26, 2012 10:24 am

Hi,

I cannot yet share the code I have for that, sorry. But please take into account this:
1) a circular buffer does not necessarily move memory circularly at each update step
2) the circular buffers I know of do not provide linear access to data. (no lin access = performance killer).

What you have to do is get or implement a linear access circular buffer. When, in the fir filter, you need to compute, you just have to Eigen::Map the coefficients and the right part of the circular buffer. It works *great*.

Cheers,
Romain

rbossart, proud to be a member of KDE forums since 2008-Dec.

nbecker Registered Member Posts 4 Karma 0	[newb] eigen3 for FIR filter (convolution)? Fri May 25, 2012 2:55 pm newb here. Is there any eigen3 code that could help with 1D FIR filtering?
kp0987 Registered Member Posts 21 Karma 0	Re: [newb] eigen3 for FIR filter (convolution)? Fri May 25, 2012 5:09 pm See viewtopic.php?f=74&t=97365&p=205603&hilit=fir#p205585 which may be some help.
rbossart Registered Member Posts 14 Karma 0	Re: [newb] eigen3 for FIR filter (convolution)? Sat May 26, 2012 10:24 am Hi, I cannot yet share the code I have for that, sorry. But please take into account this: 1) a circular buffer does not necessarily move memory circularly at each update step 2) the circular buffers I know of do not provide linear access to data. (no lin access = performance killer). What you have to do is get or implement a linear access circular buffer. When, in the fir filter, you need to compute, you just have to Eigen::Map the coefficients and the right part of the circular buffer. It works great. Cheers, Romain rbossart, proud to be a member of KDE forums since 2008-Dec.

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