Substituting the actual values for the first outer loop iteration:
for(i=1; i<=10; i++) {
sum = 0.0;
for(j=1; j<=0; j++)
sum += a[i-1][j]*R[i-j]; <-- this line never gets executed
- David
On 20/09/16 00:06, Steve wrote:
> I know this is 20 year old code, but in looking for why my program
> produces different pitch values (off by a fraction), I am looking at
> this algorithm in lpc.c:
>
> void levinson_durbin( float R[], float lpcs[], int order) {
> float a[order+1][order+1]; < automatic no initialization
>
> for(i=1; i<=order; i++) {
> sum = 0.0;
>for(j=1; j<=i-1; j++)
> sum += a[i-1][j]*R[i-j]; <-- R multiplied by unknown data
>
> I've even looked at the referenced Makhoul paper, and it glosses over
> whatever "a" is supposed to be initially assigned.
>
> I tried assigning 1.0 to "a" elements. Even -1.0 just for kicks.
>
> I guess it doesn't really matter what "a" is, as it seems to work anyway??
>
>
>
> --
>
>
>
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