/* Interpolate the LSF vector (used for fixed gain smoothing). The interpolation is done over all four subframes even in MODE_12k2. */
static void interpolate_lsf(float lsf_q[4][LP_FILTER_ORDER], float *lsf_new)
/* Interpolate the LSF vector (used for fixed gain smoothing). The interpolation is done over all four subframes even in MODE_12k2. */
static void interpolate_lsf(float lsf_q[4][LP_FILTER_ORDER], float *lsf_new)
{
    int i;
    for (i = 0; i < 4; i++)
        ff_weighted_vector_sumf(lsf_q[i], lsf_q[3], lsf_new,
                                0.25 * (3 - i), 0.25 * (i + 1),
                                LP_FILTER_ORDER);
}