Exemple #1
0
static void
compute_fwdflat_sen_active(ngram_search_t *ngs, int frame_idx)
{
    int32 i, w;
    int32 *awl;
    root_chan_t *rhmm;
    chan_t *hmm;

    acmod_clear_active(ps_search_acmod(ngs));

    i = ngs->n_active_word[frame_idx & 0x1];
    awl = ngs->active_word_list[frame_idx & 0x1];

    for (w = *(awl++); i > 0; --i, w = *(awl++)) {
        rhmm = (root_chan_t *)ngs->word_chan[w];
        if (hmm_frame(&rhmm->hmm) == frame_idx) {
            acmod_activate_hmm(ps_search_acmod(ngs), &rhmm->hmm);
        }

        for (hmm = rhmm->next; hmm; hmm = hmm->next) {
            if (hmm_frame(&hmm->hmm) == frame_idx) {
                acmod_activate_hmm(ps_search_acmod(ngs), &hmm->hmm);
            }
        }
    }
}
Exemple #2
0
static int
phone_loop_search_step(ps_search_t *search, int frame_idx)
{
    phone_loop_search_t *pls = (phone_loop_search_t *)search;
    acmod_t *acmod = ps_search_acmod(search);
    int16 const *senscr;
    int i;

    /* All CI senones are active all the time. */
    if (!ps_search_acmod(pls)->compallsen) {
        acmod_clear_active(ps_search_acmod(pls));
        for (i = 0; i < pls->n_phones; ++i)
            acmod_activate_hmm(acmod, (hmm_t *)&pls->hmms[i]);
    }

    /* Calculate senone scores for current frame. */
    senscr = acmod_score(acmod, &frame_idx);

    /* Renormalize, if necessary. */
    if (pls->best_score + (2 * pls->beam) WORSE_THAN WORST_SCORE) {
        E_INFO("Renormalizing Scores at frame %d, best score %d\n",
               frame_idx, pls->best_score);
        renormalize_hmms(pls, frame_idx, pls->best_score);
    }

    /* Evaluate phone HMMs for current frame. */
    evaluate_hmms(pls, senscr, frame_idx);

    /* Store hmm scores for senone penaly calculation */
    store_scores(pls, frame_idx);

    /* Prune phone HMMs. */
    prune_hmms(pls, frame_idx);

    /* Do phone transitions. */
    phone_transition(pls, frame_idx);

    return 0;
}