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Re:Linkwitz transform 11 years 1 month ago #3668

 dreite Offline Platinum Member Posts: 1656 Thank you received: 739 Charlie, I will most likely be at the Burning Amp festival this year. If you find me we can touch base and maybe I can help you with miniDSP-related items. Dave. Please Log in or Create an account to join the conversation.

Re: Linkwitz transform 10 years 11 months ago #4191

 CharlieLaub Offline Premium Member Posts: 113 Thank you received: 8 You can calculate the magnitude and phase responses versus frequency in Excel. Here is how to do it: 1. Calculate z^-1 versus frequency 2. use the biquad coefficients to calculate the transfer function using Excel's complex number functions. See "digital crossovers" in the Applications menu on this web site for info on the IIR transfer function 3. Calculate the magnitude (use IMABS) and phase (IMARGUMENT) of the transfer function for each z^-1 I do this in a loudspeaker crossover design spreadsheet that I have recently put together, which I will be releasing early next year in order to plot the response of the filters for the MiniDSP and compare them to analog filter functions. -Charlie The following user(s) said Thank You: Crumboo Please Log in or Create an account to join the conversation.

Re: Linkwitz transform 10 years 11 months ago #4195

 Crumboo Offline Premium Member Posts: 144 Thank you received: 14 Thank you, I think that it is the first step that is wrong in my calculations. How do you express z^-1 vs. frequency? I have used z=exp(j*2*PI*f/f_sample). I believe the frequency should be corrected for frequency warping, but the result I get is wrong I'm afraid. Interesting about your spreadsheet, are you releasing it for free? Please Log in or Create an account to join the conversation.