FreeCalypso > hg > efr-experiments
diff src/sig_proc.h @ 0:56410792419a
src: original EFR source from ETSI
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Wed, 03 Apr 2024 05:31:37 +0000 |
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| children |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/sig_proc.h Wed Apr 03 05:31:37 2024 +0000 @@ -0,0 +1,126 @@ +/*--------------------------------------------------------------* +* Function prototypes for general SIGnal PROCessing functions. * +*--------------------------------------------------------------*/ + +/* Mathematic functions */ + +Word32 Inv_sqrt ( /* (o) : output value (range: 0<=val<1) */ + Word32 L_x /* (i) : input value (range: 0<=val<=7fffffff) */ +); +void Log2 ( + Word32 L_x, /* (i) : input value */ + Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */ + Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1)*/ +); +Word32 Pow2 ( /* (o) : result (range: 0<=val<=0x7fffffff) */ + Word16 exponent, /* (i) : Integer part. (range: 0<=val<=30) */ + Word16 fraction /* (i) : Fractional part. (range: 0.0<=val<1.0) */ +); + +/* General signal processing */ + +void Init_Pre_Process (void); +void Pre_Process ( + Word16 signal[], /* Input/output signal */ + Word16 lg /* Lenght of signal */ +); + +Word16 Autocorr ( + Word16 x[], /* (i) : Input signal */ + Word16 m, /* (i) : LPC order */ + Word16 r_h[], /* (o) : Autocorrelations (msb) */ + Word16 r_l[], /* (o) : Autocorrelations (lsb) */ + const Word16 wind[]/* (i) : window for LPC analysis. */ +); +void Lag_window ( + Word16 m, /* (i) : LPC order */ + Word16 r_h[], /* (i/o) : Autocorrelations (msb) */ + Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */ +); +void Levinson ( + Word16 Rh[], /* (i) : Rh[m+1] Vector of autocorrelations (msb) */ + Word16 Rl[], /* (i) : Rl[m+1] Vector of autocorrelations (lsb) */ + Word16 A[], /* (o) : A[m] LPC coefficients (m = 10) */ + Word16 rc[] /* (o) : rc[4] First 4 reflection coefficients */ +); +void Az_lsp ( + Word16 a[], /* (i) : predictor coefficients */ + Word16 lsp[], /* (o) : line spectral pairs */ + Word16 old_lsp[] /* (i) : old lsp[] (in case not found 10 roots) */ +); +void Lsp_Az ( + Word16 lsp[], /* (i) : line spectral frequencies */ + Word16 a[] /* (o) : predictor coefficients (order = 10) */ +); +void Lsf_lsp ( + Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */ + Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */ + Word16 m /* (i) : LPC order */ +); +void Lsp_lsf ( + Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */ + Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */ + Word16 m /* (i) : LPC order */ +); +void Reorder_lsf ( + Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */ + Word16 min_dist, /* (i) : minimum required distance */ + Word16 n /* (i) : LPC order */ +); +void Weight_Fac ( + Word16 gamma, /* (i) : Spectral expansion. */ + Word16 fac[] /* (i/o) : Computed factors. */ +); +void Weight_Ai ( + Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */ + const Word16 fac[],/* (i) : Spectral expansion factors. */ + Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */ +); +void Residu ( + Word16 a[], /* (i) : prediction coefficients */ + Word16 x[], /* (i) : speech signal */ + Word16 y[], /* (o) : residual signal */ + Word16 lg /* (i) : size of filtering */ +); +void Syn_filt ( + Word16 a[], /* (i) : a[m+1] prediction coefficients (m=10) */ + Word16 x[], /* (i) : input signal */ + Word16 y[], /* (o) : output signal */ + Word16 lg, /* (i) : size of filtering */ + Word16 mem[], /* (i/o): memory associated with this filtering. */ + Word16 update /* (i) : 0=no update, 1=update of memory. */ +); +void Convolve ( + Word16 x[], /* (i) : input vector */ + Word16 h[], /* (i) : impulse response */ + Word16 y[], /* (o) : output vector */ + Word16 L /* (i) : vector size */ +); +void agc ( + Word16 *sig_in, /* (i) : postfilter input signal */ + Word16 *sig_out, /* (i/o): postfilter output signal */ + Word16 agc_fac, /* (i) : AGC factor */ + Word16 l_trm /* (i) : subframe size */ +); +void agc2 ( + Word16 *sig_in, /* (i) : postfilter input signal */ + Word16 *sig_out, /* (i/o): postfilter output signal */ + Word16 l_trm /* (i) : subframe size */ +); +void preemphasis ( + Word16 *signal, /* (i/o): input signal overwritten by the output */ + Word16 g, /* (i) : preemphasis coefficient */ + Word16 L /* (i) : size of filtering */ +); + +/* General */ + +void Copy ( + Word16 x[], /* (i) : input vector */ + Word16 y[], /* (o) : output vector */ + Word16 L /* (i) : vector length */ +); +void Set_zero ( + Word16 x[], /* (o) : vector to clear */ + Word16 L /* (i) : length of vector */ +);