Lines Matching refs:lp_half_order
81 static void lsp2poly(int* f, const int16_t* lsp, int lp_half_order)
88 for(i=2; i<=lp_half_order; i++)
98 void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order)
104 lsp2poly(f1, lsp , lp_half_order);
105 lsp2poly(f2, lsp+1, lp_half_order);
109 for(i=1; i<lp_half_order+1; i++)
116 lp[(lp_half_order << 1) + 1 - i] = (ff1 - ff2) >> 11; // divide by 2 and (3.22) -> (3.12)
122 int lp_half_order = lp_order >> 1;
130 ff_lsp2polyf(lsp , pa, lp_half_order );
131 ff_lsp2polyf(lsp + 1, qa, lp_half_order - 1);
133 for (i = 1, j = lp_order - 1; i < lp_half_order; i++, j--) {
140 lp[lp_half_order - 1] = (1.0 + lsp[lp_order - 1]) *
141 pa[lp_half_order] * 0.5;
161 void ff_lsp2polyf(const double *lsp, double *f, int lp_half_order)
168 for(i=2; i<=lp_half_order; i++)
178 void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order)
181 float *lpc2 = lpc + (lp_half_order << 1) - 1;
183 assert(lp_half_order <= MAX_LP_HALF_ORDER);
185 ff_lsp2polyf(lsp, pa, lp_half_order);
186 ff_lsp2polyf(lsp + 1, qa, lp_half_order);
188 while (lp_half_order--) {
189 double paf = pa[lp_half_order+1] + pa[lp_half_order];
190 double qaf = qa[lp_half_order+1] - qa[lp_half_order];
192 lpc [ lp_half_order] = 0.5*(paf+qaf);
193 lpc2[-lp_half_order] = 0.5*(paf-qaf);