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