If this is the code you used, then it's correct. angle is set to zero
and never changed (you commented it out here).
On Thu, 23 Jul 2009, s...@hotmail.com wrote:
> I am using the cos function provided in ADSP218x c
library. I am using it in the following function
> void GenerateFilter(short Key, short * H, short * G)
> {
> short i;
> short coeff;
> float fN=(float)N;
> float angle=0;
> float cAngle;
> float fangle=(2*3.1415*(Key+0.5))/fN;
> for(i=0;i
> {
> //angle=(fangle*i*180/PI);
> cAngle=cos(angle);
> coeffgle*32767;
> H[i]=G[i]*coeff;
> angle=angle+fangle;
> if(angle>4*PI)
> angle=angle-4*PI;
> }
> }
>
> Let Key be 49. The fangle becomes 0.868739 and the angle increments by
>0.868739 in each loop. cos function assumes values in radians. When cos
>is called with 0.868739 as input the output is -8.90891e-006, againt the
>output in matlab which is 0.6458. I cant understand why is cos function
>not working properly.
>