FreeCalypso > hg > gsm-codec-lib
diff libtwamr/autocorr.h @ 253:54f6bc41ed10
libtwamr: integrate a* modules
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Fri, 05 Apr 2024 06:08:15 +0000 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtwamr/autocorr.h Fri Apr 05 06:08:15 2024 +0000 @@ -0,0 +1,58 @@ +/* +******************************************************************************** +* +* GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 +* R99 Version 3.3.0 +* REL-4 Version 4.1.0 +* +******************************************************************************** +* +* File : autocorr.h +* Purpose : Compute autocorrelations of signal with windowing +* +******************************************************************************** +*/ +#ifndef autocorr_h +#define autocorr_h "$Id $" + +/* +******************************************************************************** +* INCLUDE FILES +******************************************************************************** +*/ +#include "typedef.h" + +/* +******************************************************************************** +* DEFINITION OF DATA TYPES +******************************************************************************** +*/ + +/* +******************************************************************************** +* DECLARATION OF PROTOTYPES +******************************************************************************** +*/ +/* +************************************************************************** +* +* Function : autocorr +* Purpose : Compute autocorrelations of signal with windowing +* Description : - Windowing of input speech: s'[n] = s[n] * w[n] +* - Autocorrelations of input speech: +* r[k] = sum_{i=k}^{239} s'[i]*s'[i-k] k=0,...,10 +* The autocorrelations are expressed in normalized +* double precision format. +* Returns : Autocorrelation +* +************************************************************************** +*/ +Word16 Autocorr ( + Word16 x[], /* (i) : Input signal (L_WINDOW) */ + Word16 m, /* (i) : LPC order */ + Word16 r_h[], /* (o) : Autocorrelations (msb) (MP1) */ + Word16 r_l[], /* (o) : Autocorrelations (lsb) (MP1) */ + const Word16 wind[]/* (i) : window for LPC analysis. (L_WINDOW) */ +); + +#endif