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Altera_Forum

Honored Contributor I

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06-26-2018
12:01 PM

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FIR II bit growth

Good afternoon,

Can I please ask if there is any formula connecting the FIR II filter's performance and bit widths (especially coefficient width). To be more precise I would like to short out (reduce) the output width that as far as I understand is determined by:input width+coefficient width+ log2(coefficient number). I would like that as short as possible,is there any way to relate the attenuation achieved with the coefficient bit width? Bear in mind that I simply import floating point coefficients, fixed point would increase the outoput size dramatically. Thanks in advance, GLink Copied

4 Replies

Altera_Forum

Honored Contributor I

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06-26-2018
12:43 PM

58 Views

Altera_Forum

Honored Contributor I

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06-26-2018
01:55 PM

58 Views

Kaz,

Thank you very much for your reply, It is very helpful explaining how the conversion works but unfortunately is not what I am after. I would like to know if there is any formula (mathematical relation) between output performance and bit growth. Best Regards George
Altera_Forum

Honored Contributor I

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06-26-2018
03:12 PM

58 Views

Altera_Forum

Honored Contributor I

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06-26-2018
03:52 PM

58 Views

Thanks a lot!

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