Mercurial > hg > aim92

/*
    Copyright (c) Applied Psychology Unit, Medical Research Council. 1988, 1989
    ===========================================================================

    Permission to use, copy, modify, and distribute this software without fee
    is hereby granted for research purposes, provided that this copyright
    notice appears in all copies and in all supporting documentation, and that
    the software is not redistributed for any fee (except for a nominal shipping
    charge). Anyone wanting to incorporate all or part of this software in a
    commercial product must obtain a license from the Medical Research Council.

    The MRC makes no representations about the suitability of this
    software for any purpose.  It is provided "as is" without express or implied
    warranty.

    THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
    ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE
    A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
    DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

/*
    Acknowledgment:
    ==============

    The source code provided in this file was originally developed by
    Christian Giguere as part of a Ph.D degree at the Department of
    Engineering of the University of Cambridge from April 1990 to
    November 1993. The code was subsequently adapted under a grant
    from the Hearing Research Trust for full compatibility with
    AIM Release 6.15.

    Christian Giguere 25/03/94

*/

/*
    ===========================================================
    wdf_ear.h
    ===========================================================

    Wave digital filter (WDF) implementation of the outer and
    middle ear (EAR) electroacoustic networks.

    Author        : Christian Giguere
    First written : 01st July, 1991
    Last edited   : 17th February, 1994
    ===========================================================
*/

#ifndef _WDF_EAR_H_


/***** defines *****/

#define _WDF_EAR_H_


/***** private data structures for WDF-EAR module *****/

typedef struct _wave_wdf_state      WaveWDFstate ;
typedef struct _eartube_wdf_state   EartubeWDFstate ;
typedef struct _earmiddle_wdf_state EarmiddleWDFstate ;

struct _wave_wdf_state {
  double gamma01 ;                        /* WDF multiplier coefficients (Adaptors 0-2) */
  double gamma11 ;
  double gamma21 ;
  int    Nstates ;                        /* number of states stored */
  char   *states ;                        /* WDF state vector */
  } ;

struct _eartube_wdf_state {
  double gamma31 ;                        /* WDF multiplier coefficients (Adaptors 3-6) */
  double gamma41 ;
  double gamma51 ;
  double gamma61 ;
  int    Nstates ;                        /* number of states stored */
  char   *states ;                        /* WDF state vector */
  } ;

struct _earmiddle_wdf_state {
  double gamma71 ;                        /* WDF multiplier coefficients (Adaptors 7-22) */
  double gamma81,  gamma82  ;
  double gamma91,  gamma92  ;
  double gamma101 ;
  double gamma111, gamma112 ;
  double gamma121 ;
  double gamma131 ;
  double gamma141 ;
  double gamma151 ;
  double gamma161 ;
  double gamma171, gamma172 ;
  double gamma181 ;
  double gamma191 ;
  double gamma201, gamma202 ;
  double gamma211, gamma212 ;
  double gamma221 ;
  double ratio ;                          /* transformer ratio between oval window and eardrum */
  void   (*update_proc)() ;               /* procedure to update time-varying coeff gamma221 */
  int    Nstates ;                        /* number of states stored */
  char   *states ;                        /* WDF state vector */
  double out_scale ;                      /* output gain */
  } ;


/***** externals *****/

extern WaveWDFstate      *FreefieldWDF() ;
extern EartubeWDFstate   *EartubeWDF() ;
extern EarmiddleWDFstate *EarmiddleWDF() ;
extern void               DoEarWDF(), CloseEarWDF() ;

#endif
author	tomwalters
date	Fri, 20 May 2011 15:19:45 +0100
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