comparison wdf/wdf_tl.h @ 0:5242703e91d3 tip

Initial checkin for AIM92 aimR8.2 (last updated May 1997).

+/*
+    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_tl.h 
+    =============================================================
+
+    Wave digital filter (WDF) implementation of the cochlear 
+    transmission line (TL) network.
+    
+    Author        : Christian Giguere
+    First written : 19th March, 1991
+    Last edited   : 18th February, 1994
+    =============================================================
+*/
+
+#ifndef _WDF_TL_H_
+
+
+/***** defines *****/
+
+#define _WDF_TL_H_
+
+#define  DISPLACEMENT       (         0 )
+#define  VELOCITY           (         1 ) 
+
+
+/***** private data structure for WDF-TL module *****/
+
+typedef struct _wdf_filter_state WDFilterState ;
+
+struct _wdf_filter_state {
+    double gamma231 ;                     /* WDF multiplier coefficients (Adaptors 23-25) */
+    double gamma241 ;
+    double gamma251, gamma252 ;
+    char   *states;                       /* WDF state vector */
+    char   *coeffs ;                      /* WDF coefficient vector (not used) */
+    double out_scale_disp ;               /* scaling to convert output to BM displacement */
+    double out_scale_vel ;                /* scaling to convert output to BM velocity */
+    double OHC_gain ;                     /* normalized OHC feedback gain */
+    double OHC_sat ;                      /* normalized OHC half-saturation displacement */
+    int    active ;                       /* is channel active for display ? (0=no, 1=yes) */
+    double rms ;                          /* BM rms vibration amplitude */
+    long   sample ;                       /* sample size in rms computation */
+    } ;
+
+
+/***** externals *****/
+
+extern WDFilterState *WDFilter() ;
+extern void           DoWDFdataArray(), CloseWDF() ;
+
+#endif 
+