Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 6:13 PM, Alexandre Torres Porres wrote: > after some shots in the dark, adjustments and stuff, I was able to make it > work really well... thanks a lot again, will put this out hopefully soon > after I clean it up and include some features. Cheers > Great! Thank you for th

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 6:32 PM, Simon Wise wrote: > On 24/09/13 21:46, Funs Seelen wrote: > >> On Tue, Sep 24, 2013 at 3:35 PM, Alexandre Torres Porres >> wrote: >> >> so you're basically saying all i need to use is use only the real part, >>> right? >>> >>> >> No, I meant that I have the idea

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On 24/09/13 21:46, Funs Seelen wrote: On Tue, Sep 24, 2013 at 3:35 PM, Alexandre Torres Porres wrote: so you're basically saying all i need to use is use only the real part, right? No, I meant that I have the idea that the imaginary part in the calculated coefficients will disappear automati

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

re Torres Porres > *Subject: **Re: [PD] from poles/zeros to biquad coefficients - how to? > (something like max's z-plane)* > *Date: *September 24, 2013 12:36:27 AM CDT > *To: *Funs Seelen > *Cc: *pd-lista puredata > > > for what i see, it's not some sort

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Porres > Subject: Re: [PD] from poles/zeros to biquad coefficients - how to? > (something like max's z-plane) > Date: September 24, 2013 12:36:27 AM CDT > To: Funs Seelen > Cc: pd-lista puredata > > > for what i see, it's not some sort of straight formula, right?

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 3:35 PM, Alexandre Torres Porres wrote: > so you're basically saying all i need to use is use only the real part, > right? > No, I meant that I have the idea that the imaginary part in the calculated coefficients will disappear automatically if you add complex conjugates f

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

hey, starting to see what you mean much more clear, cool, really excited. Thanks a lot! 2013/9/24 Alexandre Torres Porres > so you're basically saying all i need to use is use only the real part, > right? > > my frankenstein was working and alive for several times until i tried some > bandp

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

so you're basically saying all i need to use is use only the real part, right? my frankenstein was working and alive for several times until i tried some bandpass coeff, let's se if i fix this now :) 2013/9/24 Funs Seelen > > > > On Tue, Sep 24, 2013 at 3:08 PM, Funs Seelen wrote: > >> On Tue

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 3:08 PM, Funs Seelen wrote: > On Tue, Sep 24, 2013 at 2:50 PM, Alexandre Torres Porres > wrote: > >> one doubt emerges really soon anyway. Since they are complex (there are >> two coordinate numbers for each pole and zero) how do I get only one number >> by, for example,

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

well, not sure what you mean, again way over my head, but I was giving it a hard shot in the dark and it seemed to have worked out :) I just summed both parts of Z0, for instance, and tried the given math, numbers came out! now to make more tests and see if this is consistent, then finish the pat

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 2:50 PM, Alexandre Torres Porres wrote: > one doubt emerges really soon anyway. Since they are complex (there are > two coordinate numbers for each pole and zero) how do I get only one number > by, for example, summing or multiplying one pole to the other? as in: > > *b1* =

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Tue, Sep 24, 2013 at 2:36 PM, Alexandre Torres Porres wrote: > > > This is the online tool: > http://kmt.hku.nl/~pieter/cgi-bin/resp/nph-PZT.cgi. > > damn, it says it cant load it here :P > It doesn't load here either. Perhaps the server is too busy since I put this link here and sent a thousa

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

hey joe, this blog is awesome, I stumbled upon it too, they even have an applet that does the job I want, but no code or formulas around :P it's the closest thing I found on the subject in the internet... weird how I can't seem to find these formulas on google and all... cheers 2013/9/24 Joe Wh

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

one doubt emerges really soon anyway. Since they are complex (there are two coordinate numbers for each pole and zero) how do I get only one number by, for example, summing or multiplying one pole to the other? as in: *b1* = -(P0 + P1) *b2* = (P0*P1) cheers! 2013/9/24 Alexandre Torres Porres

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

> This is the online tool: http://kmt.hku.nl/~pieter/cgi-bin/resp/nph-PZT.cgi. damn, it says it cant load it here :P but this seems like a simple formula to try out, from what you copied here. If that's all, and if I got what it means, I can see a patch coming right now :) let's see! thanks 20

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Hey Alexandre, This blog - EarLevel Engineering - really helped with my understanding of poles/zeros and biquads. Hope it's useful! Cheers, Joe On 24 September 2013 06:36, Alexandre Torres Porres wrote: > for what i see, it's not some sort of s

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Hi Alexandre, This is the online tool: http://kmt.hku.nl/~pieter/cgi-bin/resp/nph-PZT.cgi. It starts with an example and every time you refresh the page it gives you a new one. If you scroll down there's a link that tells you how the coefficients were calculated, e.g.: 2 zeros give 3 coefficients

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

for what i see, it's not some sort of straight formula, right? seems a bit more complicated than that. cheers 2013/9/23 Funs Seelen > On Mon, Sep 23, 2013 at 5:35 PM, Alexandre Torres Porres > wrote: > >> >> thanks, here's a pic of what I have so far >> >> >> https://fbcdn-sphotos-g-a.akamaih

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

> Great that you're doing this! thanks, here's a pic of what I have so far https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn1/11212_10151872996046683_1825736206_n.jpg > For extra inspiration you could have a look at PoZeTools It sure does look like what I need. Thanks. But extracting what I

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

On Mon, Sep 23, 2013 at 5:35 PM, Alexandre Torres Porres wrote: > > thanks, here's a pic of what I have so far > > > https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-prn1/11212_10151872996046683_1825736206_n.jpg > Cool. > > > For extra inspiration you could have a look at PoZeTools > > It sur

Re: [PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Hi Alexandre, Great that you're doing this! For extra inspiration you could have a look at PoZeTools (http://kmt.hku.nl/~pieter/SOFT/RESP/html/PoZeTools.html). It's great software by Pieter Suurmond. He's the one who taught me filter design and he probably has some info about Z-transform on his we

[PD] from poles/zeros to biquad coefficients - how to? (something like max's z-plane)

Hi there. So, I've been studying a lot about filters, and I'm doing this clone of max's z-plane in Pd. I hope anyone can help me guide where to find how to convert the values of the complex poles and zeros to biquad coefficients. I really needed that... Sorry if I missed it in Miller's book or so