Sigma Studio -> Linkwits Transform

Hi, 

This is my first post. Please bare with me, as I am not an egineer and I am learning the basics of Sigma Studio to configure my ADAU1701 DSP. If this is not the correct site to make my rookie's  questions, just let me know. 

I am using my ADAU1701 to integrate my subwoofer to my mains and to get the proper room response. It's a DIY 15" sealed SW and I would like to implement a Linkwitz Transform to get better low frequency response. 

I already implemented using another DSP software (from MiniDSP), but I would really know how to implement it on Sigma Studio. From the spechsheet I get the digital biquad coefficients, that they look like this:

a1 1,996297042315250
a2 -0,996303883545513
b0 1,001259526446320
b1 -1,996288114509760
b2 0,995053284904683

I don't know where to integrate properly this info in Sigma Studio. Well, this is my birst question regarding my ADAU1701, but I have a ton more... hope you can help me. 

Thanks in advance!

Parents Reply
  • Yes. 

    Thanks to Dave's help and some reading here in EngineerZone I managed to properly implment the LT in SigmaStudio. 

    Sigma Studio doesn't have a 'Linkwitz Transform' filter block, so the solution is to implement it as a IIR filter. 

    The coefficients are calculated with the spreadsheet in the MiniDSP site, and from the info I've read (credits to all those who found/though of this), the spreadsheet and Sigmastudio use different definitions of coefficients a1 and a2, so you have to multiply the spreadsheet's a1 and a2 values by -1 before plugging them into Sigmastudio.

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