FreeCalypso > hg > gsm-codec-lib
view libgsmefr/sig_proc.h @ 440:bc736a8654af
.hgignore: add amrefr-decode-r
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Thu, 09 May 2024 00:13:05 +0000 |
parents | 988fd7ff514f |
children |
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/*--------------------------------------------------------------* * 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 (struct EFR_encoder_state *st); void Pre_Process ( struct EFR_encoder_state *st, 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 ( struct EFR_encoder_state *st, 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 ( struct EFR_decoder_state *st, 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 ( struct EFR_decoder_state *st, Word16 *signal, /* (i/o): input signal overwritten by the output */ Word16 g, /* (i) : preemphasis coefficient */ Word16 L /* (i) : size of filtering */ );