tomwalters@0: /*
tomwalters@0:     Copyright (c) Applied Psychology Unit, Medical Research Council. 1988, 1989
tomwalters@0:     ===========================================================================
tomwalters@0: 
tomwalters@0:     Permission to use, copy, modify, and distribute this software without fee 
tomwalters@0:     is hereby granted for research purposes, provided that this copyright 
tomwalters@0:     notice appears in all copies and in all supporting documentation, and that 
tomwalters@0:     the software is not redistributed for any fee (except for a nominal shipping 
tomwalters@0:     charge). Anyone wanting to incorporate all or part of this software in a
tomwalters@0:     commercial product must obtain a license from the Medical Research Council.
tomwalters@0: 
tomwalters@0:     The MRC makes no representations about the suitability of this 
tomwalters@0:     software for any purpose.  It is provided "as is" without express or implied 
tomwalters@0:     warranty.
tomwalters@0:  
tomwalters@0:     THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 
tomwalters@0:     ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE
tomwalters@0:     A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY 
tomwalters@0:     DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
tomwalters@0:     AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
tomwalters@0:     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
tomwalters@0: */
tomwalters@0: 
tomwalters@0: /*  
tomwalters@0:     Acknowledgment:
tomwalters@0:     ==============
tomwalters@0: 
tomwalters@0:     The source code provided in this file was originally developed by 
tomwalters@0:     Christian Giguere as part of a Ph.D degree at the Department of
tomwalters@0:     Engineering of the University of Cambridge from April 1990 to
tomwalters@0:     November 1993. The code was subsequently adapted under a grant
tomwalters@0:     from the Hearing Research Trust for full compatibility with 
tomwalters@0:     AIM Release 6.15.
tomwalters@0: 
tomwalters@0:     Christian Giguere 25/03/94
tomwalters@0: 
tomwalters@0: */
tomwalters@0: 
tomwalters@0: /*
tomwalters@0:     =============================================================
tomwalters@0:     wdf_tl.h 
tomwalters@0:     =============================================================
tomwalters@0: 
tomwalters@0:     Wave digital filter (WDF) implementation of the cochlear 
tomwalters@0:     transmission line (TL) network.
tomwalters@0:     
tomwalters@0:     Author        : Christian Giguere
tomwalters@0:     First written : 19th March, 1991
tomwalters@0:     Last edited   : 18th February, 1994
tomwalters@0:     =============================================================
tomwalters@0: */
tomwalters@0: 
tomwalters@0: #ifndef _WDF_TL_H_
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /***** defines *****/
tomwalters@0: 
tomwalters@0: #define _WDF_TL_H_
tomwalters@0: 
tomwalters@0: #define  DISPLACEMENT       (         0 )
tomwalters@0: #define  VELOCITY           (         1 ) 
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /***** private data structure for WDF-TL module *****/
tomwalters@0: 
tomwalters@0: typedef struct _wdf_filter_state WDFilterState ;
tomwalters@0: 
tomwalters@0: struct _wdf_filter_state {
tomwalters@0:     double gamma231 ;                     /* WDF multiplier coefficients (Adaptors 23-25) */
tomwalters@0:     double gamma241 ;
tomwalters@0:     double gamma251, gamma252 ;
tomwalters@0:     char   *states;                       /* WDF state vector */
tomwalters@0:     char   *coeffs ;                      /* WDF coefficient vector (not used) */
tomwalters@0:     double out_scale_disp ;               /* scaling to convert output to BM displacement */
tomwalters@0:     double out_scale_vel ;                /* scaling to convert output to BM velocity */
tomwalters@0:     double OHC_gain ;                     /* normalized OHC feedback gain */
tomwalters@0:     double OHC_sat ;                      /* normalized OHC half-saturation displacement */
tomwalters@0:     int    active ;                       /* is channel active for display ? (0=no, 1=yes) */
tomwalters@0:     double rms ;                          /* BM rms vibration amplitude */
tomwalters@0:     long   sample ;                       /* sample size in rms computation */
tomwalters@0:     } ;
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /***** externals *****/
tomwalters@0: 
tomwalters@0: extern WDFilterState *WDFilter() ;
tomwalters@0: extern void           DoWDFdataArray(), CloseWDF() ;
tomwalters@0: 
tomwalters@0: #endif 
tomwalters@0: