1 /* ==================================================================== 2 * Copyright (c) 2006 Carnegie Mellon University. All rights 3 * reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in 14 * the documentation and/or other materials provided with the 15 * distribution. 16 * 17 * This work was supported in part by funding from the Defense Advanced 18 * Research Projects Agency and the National Science Foundation of the 19 * United States of America, and the CMU Sphinx Speech Consortium. 20 * 21 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 22 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY 25 * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 * ==================================================================== 34 * 35 */ 36 37 #ifndef FE_WARP_inverse_linear_H 38 #define FE_WARP_inverse_linear_H 39 40 #include "sphinxbase/fe.h" 41 42 43 #ifdef __cplusplus 44 extern "C" { 45 #endif 46 #if 0 47 /* Fool Emacs. */ 48 } 49 #endif 50 51 const char * 52 fe_warp_inverse_linear_doc(void); 53 54 uint32 55 fe_warp_inverse_linear_id(void); 56 57 uint32 58 fe_warp_inverse_linear_n_param(void); 59 60 void 61 fe_warp_inverse_linear_set_parameters(char const *param_str, float sampling_rate); 62 63 float 64 fe_warp_inverse_linear_warped_to_unwarped(float nonlinear); 65 66 float 67 fe_warp_inverse_linear_unwarped_to_warped(float linear); 68 69 void 70 fe_warp_inverse_linear_print(const char *label); 71 72 #ifdef __cplusplus 73 } 74 #endif 75 76 77 #endif /* FE_WARP_inverse_linear_H */ 78 79 80 /* 81 * Log record. Maintained by RCS. 82 * 83 * $Log: fe_warp_inverse_linear.h,v $ 84 * Revision 1.1 2006/02/16 00:18:26 egouvea 85 * Implemented flexible warping function. The user can specify at run 86 * time which of several shapes they want to use. Currently implemented 87 * are an affine function (y = ax + b), an inverse linear (y = a/x) and a 88 * piecewise linear (y = ax, up to a frequency F, and then it "breaks" so 89 * Nyquist frequency matches in both scales. 90 * 91 * Added two switches, -warp_type and -warp_params. The first specifies 92 * the type, which valid values: 93 * 94 * -inverse or inverse_linear 95 * -linear or affine 96 * -piecewise or piecewise_linear 97 * 98 * The inverse_linear is the same as implemented by EHT. The -mel_warp 99 * switch was kept for compatibility (maybe remove it in the 100 * future?). The code is compatible with EHT's changes: cepstra created 101 * from code after his changes should be the same as now. Scripts that 102 * worked with his changes should work now without changes. Tested a few 103 * cases, same results. 104 * 105 */ 106