math_lib.h
资源名称:melpfix.rar [点击查看]
上传用户:cxx_68
上传日期:2021-02-21
资源大小:161k
文件大小:2k
源码类别:
语音压缩
开发平台:
Visual C++
- /*
- 2.4 kbps MELP Proposed Federal Standard speech coder
- Fixed-point C code, version 1.0
- Copyright (c) 1998, Texas Instruments, Inc.
- Texas Instruments has intellectual property rights on the MELP
- algorithm. The Texas Instruments contact for licensing issues for
- commercial and non-government use is William Gordon, Director,
- Government Contracts, Texas Instruments Incorporated, Semiconductor
- Group (phone 972 480 7442).
- The fixed-point version of the voice codec Mixed Excitation Linear
- Prediction (MELP) is based on specifications on the C-language software
- simulation contained in GSM 06.06 which is protected by copyright and
- is the property of the European Telecommunications Standards Institute
- (ETSI). This standard is available from the ETSI publication office
- tel. +33 (0)4 92 94 42 58. ETSI has granted a license to United States
- Department of Defense to use the C-language software simulation contained
- in GSM 06.06 for the purposes of the development of a fixed-point
- version of the voice codec Mixed Excitation Linear Prediction (MELP).
- Requests for authorization to make other use of the GSM 06.06 or
- otherwise distribute or modify them need to be addressed to the ETSI
- Secretariat fax: +33 493 65 47 16.
- */
- /*
- math_lib.h Math include file.
- (Log and Divide functions.)
- Copyright (c) 1997 by Texas Instruments, Inc. All rights reserved.
- */
- #ifndef _math_lib_h
- #define _math_lib_h_
- /* External function definitions */
- Shortword divider(Shortword numer, Shortword denom, Shortword numer_shift,
- Shortword denom_shift);
- Shortword L_divider2 (Longword numer, Longword denom, Shortword numer_shift,
- Shortword denom_shift);
- Shortword log10_fxp(Shortword x, Shortword Q);
- Shortword L_log10_fxp(Longword x, Shortword Q);
- Shortword pow10_fxp(Shortword x, Shortword Q);
- Shortword sqrt_fxp (Shortword x, Shortword Q);
- Shortword L_sqrt_fxp(Longword x, Shortword Q);
- Shortword L_pow_fxp(Longword x,Shortword power,Shortword Q_in,Shortword Q_out);
- Shortword sin_fxp(Shortword x);
- Shortword cos_fxp(Shortword x);
- Shortword acos_fxp(Shortword x);
- #endif