diff options
Diffstat (limited to 'gr-vocoder/lib/codec2/nlp.c')
| -rw-r--r-- | gr-vocoder/lib/codec2/nlp.c | 62 |
1 files changed, 31 insertions, 31 deletions
diff --git a/gr-vocoder/lib/codec2/nlp.c b/gr-vocoder/lib/codec2/nlp.c index 42ae90919..0d5e530ce 100644 --- a/gr-vocoder/lib/codec2/nlp.c +++ b/gr-vocoder/lib/codec2/nlp.c @@ -1,11 +1,11 @@ /*---------------------------------------------------------------------------*\ - - FILE........: nlp.c - AUTHOR......: David Rowe - DATE CREATED: 23/3/93 - - Non Linear Pitch (NLP) estimation functions. - + + FILE........: nlp.c + AUTHOR......: David Rowe + DATE CREATED: 23/3/93 + + Non Linear Pitch (NLP) estimation functions. + \*---------------------------------------------------------------------------*/ /* @@ -35,9 +35,9 @@ #include <stdlib.h> /*---------------------------------------------------------------------------*\ - - DEFINES - + + DEFINES + \*---------------------------------------------------------------------------*/ #define PMAX_M 600 /* maximum NLP analysis window size */ @@ -52,9 +52,9 @@ #define NLP_NTAP 48 /* Decimation LPF order */ /*---------------------------------------------------------------------------*\ - - GLOBALS - + + GLOBALS + \*---------------------------------------------------------------------------*/ /* 48 tap 600Hz low pass FIR filter coefficients */ @@ -117,14 +117,14 @@ typedef struct { } NLP; float post_process_mbe(COMP Fw[], int pmin, int pmax, float gmax); -float post_process_sub_multiples(COMP Fw[], +float post_process_sub_multiples(COMP Fw[], int pmin, int pmax, float gmax, int gmax_bin, float *prev_Wo); /*---------------------------------------------------------------------------*\ - - nlp_create() - + + nlp_create() + Initialisation function for NLP pitch estimator. \*---------------------------------------------------------------------------*/ @@ -149,9 +149,9 @@ void *nlp_create() } /*---------------------------------------------------------------------------*\ - + nlp_destory() - + Initialisation function for NLP pitch estimator. \*---------------------------------------------------------------------------*/ @@ -163,9 +163,9 @@ void nlp_destroy(void *nlp_state) } /*---------------------------------------------------------------------------*\ - - nlp() - + + nlp() + Determines the pitch in samples using the Non Linear Pitch (NLP) algorithm [1]. Returns the fundamental in Hz. Note that the actual pitch estimate is for the centre of the M sample Sn[] vector, not @@ -189,11 +189,11 @@ void nlp_destroy(void *nlp_state) References: [1] http://www.itr.unisa.edu.au/~steven/thesis/dgr.pdf Chapter 4 - + \*---------------------------------------------------------------------------*/ float nlp( - void *nlp_state, + void *nlp_state, float Sn[], /* input speech vector */ int n, /* frames shift (no. new samples in Sn[]) */ int m, /* analysis window size */ @@ -271,7 +271,7 @@ float nlp( } } - best_f0 = post_process_sub_multiples(Fw, pmin, pmax, gmax, gmax_bin, + best_f0 = post_process_sub_multiples(Fw, pmin, pmax, gmax, gmax_bin, prev_Wo); /* Shift samples in buffer to make room for new samples */ @@ -282,13 +282,13 @@ float nlp( /* return pitch and F0 estimate */ *pitch = (float)SAMPLE_RATE/best_f0; - return(best_f0); + return(best_f0); } /*---------------------------------------------------------------------------*\ - - post_process_sub_multiples() - + + post_process_sub_multiples() + Given the global maximma of Fw[] we search interger submultiples for local maxima. If local maxima exist and they are above an experimentally derived threshold (OK a magic number I pulled out of @@ -306,7 +306,7 @@ float nlp( \*---------------------------------------------------------------------------*/ -float post_process_sub_multiples(COMP Fw[], +float post_process_sub_multiples(COMP Fw[], int pmin, int pmax, float gmax, int gmax_bin, float *prev_Wo) { @@ -361,4 +361,4 @@ float post_process_sub_multiples(COMP Fw[], return best_f0; } - + |