fs.h
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上传日期:2021-02-19
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- /*
- 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.
- */
- /*
-
- fs.h: Fourier series functions include file
- */
- #ifndef _fs_h
- #define _fs_h_
- void find_harm(Shortword input[],Shortword fsmag[],Shortword pitch,
- Shortword num_harm,Shortword length);
- void fft(Shortword *datam1,Shortword nn,Shortword isign);
- /* Shortword findmax(Longword input[],Shortword npts); */
- __inline Shortword findmax(Longword input[],Shortword npts)
- {
- register Shortword i, maxloc;
- register Longword maxval, *p_in;
- p_in = &input[0];
- maxloc = 0;
- // data_move(); mark del
- maxval = input[maxloc];
- // data_move(); mark del
- for (i = 1; i < npts; i++ ) {
- // compare_nonzero();mark del
- if (*(++p_in) > maxval) {
- maxloc = i;
- // data_move(); mark del
- maxval = *p_in;
- // data_move(); mark del
- }
- }
- return(maxloc);
- }
- void fs_init();
- void idft_real(Shortword real[], Shortword signal[], Shortword length);
- #endif