filter realization help

M

maduba

New Member

• May 12, 2020

• #1

I need a help with filter realization. I dont understand how this works. This is a multiply and accumulate filter, I dont understand why cof[0] constant is multiplied, here is the code cof is the filter coefficients and sample is the samples. Any help with this very appreciated. Thank you

 

Last edited: May 16, 2020

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 12, 2020

• #2

cof is a pointer to an array of different constants. sample is multiplied by the appropriate one.. cof[x] is indexing that array.

 

M

maduba

New Member

• May 12, 2020

• #3

thank you for the reply. I also dont understand why item /= 4 used?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• May 12, 2020

• #4

No Idea... Possibly there are multiple items per constant...

 

M

maduba

New Member

• May 12, 2020

• #5

Thank you for the reply. This is a decimating filter. Thank you very much about the explanation about cof[0].It is clear for me. I have a another question. This is also part of code and related. I dont understand how this works. I dont understand why mac function called twice.

 

Last edited: May 14, 2020