ADAU1761 calculating coefficients on a PC
Hello,
I'm using an STM32F103 acting as mass storage flash and a FatFS file system on board which allows me to take a hex file so I can upload this to a ADAU1761. Looking at the output from the SigmaStudio I see that when I use Graphic EQ eight order shelving I get what seems to be 20 parameters per band. The filter is described as a Holters/Zolser's. I want to calculate the values using the PC so I have a few questions.
Quetions:-
1) What is the structure of the filters as it seems to be using four sets of coefficients
2) What calculations apply (how to calculate on PC)
Audio Signal Processors
SigmaDSP Audio Processors
adau1761
HI cforester1965:
You shouldn't need to calculate the filters on the PC if you use either the index selectable Holters Filter OR if you use the one that takes a single parameter to control the filter. Have you given those variations a try?
Regards
Miguel
No I haven't I'm not too familiar with the software tool box only started this a few days ago.
I was thinking this was a easiest way to implement a two 14 band eq's.
Thanks for the suggestion I'll look into that.
I thought with all the filters you still need to calculate the coefficients?
The index method appears to use more resources I seem to need one filter for each level or I'm I missing something here?
Hi Miguel,
Given that I need 28 bands I think the index method is not comparable with my design.
I seem to be back to calculating on the PC. I only need to set this once, it does not need to be dynamic or click/pop free. The setting may only change 2 or 3 times in the life of the product.
Regards,
Colin.
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