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27
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31
32 #include "define.h"
33 #include "SigProc_FIX.h"
34
35 /*
36 R. Laroia, N. Phamdo and N. Farvardin, "Robust and Efficient Quantization of Speech LSP
37 Parameters Using Structured Vector Quantization", Proc. IEEE Int. Conf. Acoust., Speech,
38 Signal Processing, pp. 641-644, 1991.
39 */
40
41 /* Laroia low complexity NLSF weights */
silk_NLSF_VQ_weights_laroia(opus_int16 * pNLSFW_Q_OUT,const opus_int16 * pNLSF_Q15,const opus_int D)42 void silk_NLSF_VQ_weights_laroia(
43 opus_int16 *pNLSFW_Q_OUT, /* O Pointer to input vector weights [D] */
44 const opus_int16 *pNLSF_Q15, /* I Pointer to input vector [D] */
45 const opus_int D /* I Input vector dimension (even) */
46 )
47 {
48 opus_int k;
49 opus_int32 tmp1_int, tmp2_int;
50
51 celt_assert( D > 0 );
52 celt_assert( ( D & 1 ) == 0 );
53
54 /* First value */
55 tmp1_int = silk_max_int( pNLSF_Q15[ 0 ], 1 );
56 tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
57 tmp2_int = silk_max_int( pNLSF_Q15[ 1 ] - pNLSF_Q15[ 0 ], 1 );
58 tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
59 pNLSFW_Q_OUT[ 0 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
60 silk_assert( pNLSFW_Q_OUT[ 0 ] > 0 );
61
62 /* Main loop */
63 for( k = 1; k < D - 1; k += 2 ) {
64 tmp1_int = silk_max_int( pNLSF_Q15[ k + 1 ] - pNLSF_Q15[ k ], 1 );
65 tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
66 pNLSFW_Q_OUT[ k ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
67 silk_assert( pNLSFW_Q_OUT[ k ] > 0 );
68
69 tmp2_int = silk_max_int( pNLSF_Q15[ k + 2 ] - pNLSF_Q15[ k + 1 ], 1 );
70 tmp2_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp2_int );
71 pNLSFW_Q_OUT[ k + 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
72 silk_assert( pNLSFW_Q_OUT[ k + 1 ] > 0 );
73 }
74
75 /* Last value */
76 tmp1_int = silk_max_int( ( 1 << 15 ) - pNLSF_Q15[ D - 1 ], 1 );
77 tmp1_int = silk_DIV32_16( (opus_int32)1 << ( 15 + NLSF_W_Q ), tmp1_int );
78 pNLSFW_Q_OUT[ D - 1 ] = (opus_int16)silk_min_int( tmp1_int + tmp2_int, silk_int16_MAX );
79 silk_assert( pNLSFW_Q_OUT[ D - 1 ] > 0 );
80 }
81