1 /* ------------------------------------------------------------------
2 * Copyright (C) 1998-2009 PacketVideo
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
14 * See the License for the specific language governing permissions
15 * and limitations under the License.
16 * -------------------------------------------------------------------
18 /****************************************************************************************
19 Portions of this file are derived from the following 3GPP standard:
22 ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec
23 Available from http://www.3gpp.org
25 (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC)
26 Permission to distribute, modify and use this file under the standard license
27 terms listed above has been obtained from the copyright holder.
28 ****************************************************************************************/
33 ------------------------------------------------------------------------------
36 This file contains all the constant definitions and prototype definitions
37 needed by the lsp_avg.c
39 ------------------------------------------------------------------------------
42 /*----------------------------------------------------------------------------
43 ; CONTINUE ONLY IF NOT ALREADY DEFINED
44 ----------------------------------------------------------------------------*/
46 #define int_lpc_h "$Id $"
48 /*----------------------------------------------------------------------------
50 ----------------------------------------------------------------------------*/
53 /*--------------------------------------------------------------------------*/
59 /*----------------------------------------------------------------------------
61 ; Define module specific macros here
62 ----------------------------------------------------------------------------*/
64 /*----------------------------------------------------------------------------
66 ; Include all pre-processor statements here.
67 ----------------------------------------------------------------------------*/
69 /*----------------------------------------------------------------------------
70 ; EXTERNAL VARIABLES REFERENCES
71 ; Declare variables used in this module but defined elsewhere
72 ----------------------------------------------------------------------------*/
74 /*----------------------------------------------------------------------------
76 ----------------------------------------------------------------------------*/
78 /*----------------------------------------------------------------------------
79 ; ENUMERATED TYPEDEF'S
80 ----------------------------------------------------------------------------*/
82 /*----------------------------------------------------------------------------
83 ; STRUCTURES TYPEDEF'S
84 ----------------------------------------------------------------------------*/
86 /*----------------------------------------------------------------------------
87 ; GLOBAL FUNCTION DEFINITIONS
88 ; Function Prototype declaration
89 ----------------------------------------------------------------------------*/
92 **************************************************************************
94 * Function : Int_lpc_1and3
95 * Purpose : Interpolates the LSPs and converts to LPC parameters
96 * to get a different LP filter in each subframe.
97 * Description : The 20 ms speech frame is divided into 4 subframes.
98 * The LSPs are quantized and transmitted at the 2nd and
99 * 4th subframes (twice per frame) and interpolated at the
100 * 1st and 3rd subframe.
102 * |------|------|------|------|
106 * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm
110 **************************************************************************
112 OSCL_IMPORT_REF void Int_lpc_1and3(
113 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
114 Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of
116 Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of
118 Word16 Az[], /* o : interpolated LP parameters in all subfr.
124 **************************************************************************
126 * Function : Int_lpc_1and3_2
127 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc
128 * function but we do not recompute Az() for subframe 2 and
129 * 4 because it is already available.
132 **************************************************************************
134 void Int_lpc_1and3_2(
135 Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */
136 Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of
138 Word16 lsp_new[], /* i : LSP vector at the 4th subframe of
140 Word16 Az[], /* o :interpolated LP parameters
141 in subframes 1 and 3 (AZ_SIZE) */
146 **************************************************************************
148 * Function : Int_lpc_1to3
149 * Purpose : Interpolates the LSPs and converts to LPC parameters
150 * to get a different LP filter in each subframe.
151 * Description : The 20 ms speech frame is divided into 4 subframes.
152 * The LSPs are quantized and transmitted at the 4th
153 * subframes (once per frame) and interpolated at the
154 * 1st, 2nd and 3rd subframe.
156 * |------|------|------|------|
160 * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1
161 * sf2: 1/2 F0 + 1/2 F1 sf4: F1
164 **************************************************************************
166 OSCL_IMPORT_REF void Int_lpc_1to3(
167 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */
168 Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */
169 Word16 Az[], /* o : interpolated LP parameters in all SFs (AZ_SIZE) */
174 **************************************************************************
176 * Function : Int_lpc_1to3_2
177 * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc
178 * function but we do not recompute Az() for subframe 4
179 * because it is already available.
182 **************************************************************************
185 Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */
186 Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */
187 Word16 Az[], /* o :interpolated LP parameters in SFs 1, 2, 3
192 /*----------------------------------------------------------------------------
194 ----------------------------------------------------------------------------*/
199 #endif /* _INT_LPC_H_ */