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TI Home » TI E2E Community » Support Forums » Data Converters » Precision Data Converters » Precision Data Converters Forum » ADS1x9x EVM code
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ADS1x9x EVM code

ADS1x9x EVM code

This question is not answered
HECTOR
Posted by HECTOR
on Dec 25 2012 05:18 AM
Intellectual585 points

Hello

I am working with ADS1291 and trying to modify the code in the EVM to meet my requirments ;

In the code ADS1x9x_ECG_Processing.c  there are 3 filters ; low pass; 50_hz notch, 60 hz notch ;

As I know the notch filter must be an IIR , but as I see it is FIR in the example ; so how could you generate the Coeff.  ?

Regards

Hector

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  • HECTOR
    Posted by HECTOR
    on Dec 25 2012 10:27 AM
    Intellectual585 points

    Solved

    Thanks

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  • Don Dapkus
    Posted by Don Dapkus
    on Dec 26 2012 14:45 PM
    Guru101895 points

    Hi, Hector,

    Great! Can you share with the community how you solved it?

    BTW, this is a Precision converter, so I'm going to move it to that forum.

    -d2

    -----

    Don Dapkus

    Audio Applications Engineering Manager

    Dallas, TX USA

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  • Tom Hendrick
    Posted by Tom Hendrick
    on Dec 26 2012 21:08 PM
    Guru86210 points

    Thanks Don!

    Hi Hector! 

    Please do let us know what you you did to resolve your issue. 

     

    Regards,

    Tom

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  • HECTOR
    Posted by HECTOR
    on Dec 27 2012 04:07 AM
    Intellectual585 points

    Hello

    The Notch filter must be a IIR filter but you still can design a  FIR STOP BAND FILTER ; for example NOTCH _50Hz you can design a high order FIR stop vand filter of frequencies 47Hz-52HZ hamming filter that might do the job too ; that what is implemented in the code ;

     

    Right now I am working on it ; I still could not find the proper filter to delete the DC offset voltage which is not fix from reading to other; the readings are great enough but the DC offset makes the analysis difficult,

     

    Regards

    Hector

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