Description for IIR function in CCES BlackFin compiler library manual is:
1- What are Dm, Am, Ym?
2- Usually A1,A2 are with negative sign if we're referencing a standard difference equation:
why they have positive sign in denumerator?
2- Domain [-1,1) means input x should be scaled to be in [-1,1) range before being fed to function?
For iirdf1 function, it has following description. A1,A2 in denum have negative signs as opposed to IIR above. Why these 2 are different? Which is correct form?