Le 20 mars 2018 à 04:32, Yann Orlarey <[email protected]> a écrit
:
HI,
I did some tests and I don't see any problem with fi.fir(), it
supports very large lists. Here is the test file I used:
// ------- fir500.dsp ------
import("stdfaust.lib");
process = fi.fir((
1,2,3,4,5,6,7,8,9,10,
...48 copies...
1,2,3,4,5,6,7,8,9,10));
//---------------------------------
time faust fir500.dsp -o /dev/null
real 0m0.446s
user 0m0.375s
sys 0m0.030s
If instead, I use the second code you mentioned
// ------- fur500.dsp ------
import("stdfaust.lib");
fur(coeffs) = _ <: par(i, 500, @(i) * ba.take(i + 1, coeffs)) :> _;
process = fur((
1,2,3,4,5,6,7,8,9,10,
...48 copies...
1,2,3,4,5,6,7,8,9,10));
//---------------------------------
The compilation will take a very long time because ba.take() is
really not the way to go in this case (complexity O(n^2)). Here are
the results I get:
time faust fur500.dsp -o /dev/null
real 1m18.270s
user 1m16.947s
sys 0m0.900s
The difference is enormous (x170)!
If in your case you don't see any difference of performances
between the two, then there is a problem with the fi.fir
implementation you are using.
Can you try with the latest version of Faust (version 2.5.25)?
Cheers
Yann
2018-03-19 15:01 GMT-07:00 Oliver Larkin via Faudiostream-users
<[email protected]>:
depending on what faust version you are using, a foreign function
might help. I had to do this to do a convolution in my tambura
synthesiser for exactly the same reason
https://github.com/olilarkin/Tambura/blob/master/bridgeIR.dsp
https://github.com/olilarkin/Tambura/blob/master/bridgeIR.h
it would be great if faust’s FIR didn’t bork like this
oli
On 19 Mar 2018, at 21:32, CrocoDuck o'Ducks
<[email protected]> wrote:
Hi again!
Thank you for all your tips!
I suggest placing all of your coefficients into a large parallel
signal bank:
coeffs = (b0, b1, b2, ..., b511); // FIR filter coefficients for
length 512
and then use par() etc.
I tried both of these:
process = fi.fir(coeffs);
process = _ <: par(i, 512, @(i) * ba.take(i + 1, coeffs)) :> _;
Which, unfortunately, both suffer from the same problem. Did I
got the suggestion right?
You can set unlimited time by adding
-t 0
to your compile command.
I am currently trying this.
Interesting ! Do you have some code to show? Is is part of an
official JULIA ==> Faust project?
No, it isn't an official project. I just design some filters
using DSP.jl then I try to generate Faust code that implements
them. I just open a file for writing and I fill it with Faust
code. I guess I can cook a few minimal examples to share, I cannot
share my code right away as it is sort of confidential.
On Mon, 19 Mar, 2018 at 8:20 AM, Stéphane Letz <[email protected]>
wrote:
Le 18 mars 2018 à 23:06, CrocoDuck o'Ducks
<[email protected]
> a écrit :
Hi there!
I currently have some Julia code producing 512 taps for an FIR
filter.
Interesting ! Do you have some code to show? Is is part of an
official JULIA ==> Faust project?
Stéphane
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