pit.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:3k
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.
- */
- /*
- pit.h: include file for pitch subroutines
- */
- #ifndef _pit_h
- #define _pit_h_
- /* External function definitions */
- Shortword double_chk(Shortword sig_in[],Shortword *pcorr,Shortword pitch,
- Shortword pdouble,Shortword pmin,Shortword pmax,
- Shortword pmin_q7,Shortword pmax_q7,
- Shortword lmin);
- void double_ver(Shortword sig_in[],Shortword *pcorr,Shortword pitch,
- Shortword pmin,Shortword pmax,Shortword pmin_q7,
- Shortword pmax_q7,Shortword lmin);
- Shortword f_pitch_scale(Shortword sig_out[],Shortword sig_in[],
- Shortword length);
- Shortword find_pitch(Shortword sig_in[],Shortword *pcorr,Shortword lower,
- Shortword upper,Shortword length);
- Shortword frac_pch(Shortword sig_in[],Shortword *pcorr,Shortword fpitch,
- Shortword range,Shortword pmin,Shortword pmax,
- Shortword pmin_q7,Shortword pmax_q7,Shortword lmin);
- Shortword p_avg_update(Shortword pitch, Shortword pcorr, Shortword pthresh);
- void p_avg_init(Shortword pdecay, Shortword default_pitch,
- Shortword pdecay_pitch, Shortword num_good);
- Shortword pitch_ana(Shortword speech[],Shortword resid[],
- Shortword pitch_est,Shortword pitch_avg,
- Shortword *pcorr2);
- void pitch_ana_init(Shortword pmin,Shortword pmax,Shortword fr,
- Shortword lpf_ord, Shortword lmin);
- #endif