FreeCalypso > hg > gsm-codec-lib
view libtwamr/autocorr.h @ 282:9ee8ad3d4d30
frtest: rm gsmfr-hand-test and gsmfr-max-out utils
These hack programs were never properly documented and were written
only as part of a debug chase, in pursuit of a bug that ultimately
turned out to be in our then-hacky patch to osmo-bts-sysmo,
before beginning of proper patches in Osmocom. These hack programs
need to be dropped from the present sw package because they depend
on old libgsm, and we are eliminating that dependency.
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Sun, 14 Apr 2024 05:44:47 +0000 |
| parents | 54f6bc41ed10 |
| children |
line wrap: on
line source
/* ******************************************************************************** * * 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