-extern double vorbis_lpc_from_data(double *data,double *lpc,int n,int m);
-extern double vorbis_lpc_from_spectrum(double *curve,double *lpc,lpc_lookup *l);
-
-/* log scale layer */
-extern double vorbis_curve_to_lpc(double *curve,double *lpc,lpc_lookup *l);
-extern void vorbis_lpc_to_curve(double *curve,double *lpc, double amp,
- lpc_lookup *l);
-extern void vorbis_lpc_apply(double *residue,double *lpc, double amp,
- lpc_lookup *l);
+extern float vorbis_lpc_from_data(float *data,float *lpc,int n,int m);