Hello All,


    some months ago Olin posted the formula that changed DSP world: :)
        Filt <-- Filt + (New - Filt)*FFrac

    Saddly, my 8 bit implementation have a problem that I can't surpass:
        filt = filt + ((sig16)new - (sig16)filt) / 2;

    The value never goes to 255 because of integer roundings:
        filt = 254 + (255 - 254) / 2;
        filt = 254 + (1)/2;
        filt = 254;

    There's a way to change this? I've tried to raise the resolution making:
        filt = filt + ((sig16)new*2 - (sig16)filt*2 + 1) / 4;

    But got same results because:
        filt = 254 + ((sig16)255*2 - (sig16)254*2 + 1) / 4;
        filt = 254 + (510 - 508 + 1) / 4;
        filt = 254 + (510 - 508 + 1) / 4;
        filt = 254 + (1) / 4;

    Please, someone help me!!!

    Best regards,

    Brusque

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Edson Brusque                 C.I.Tronics Lighting Designers Ltda
Research and Development               Blumenau  -  SC  -  Brazil
Say NO to HTML mail                          www.citronics.com.br
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