view wdf/formulae_tl.c @ 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

*/

/*
    ===========================================================
    formulae_tl.c
    ===========================================================

    Supplements "formulae.c" 
    (for use with WDF-TLF cochlear filterbank)

    Author        : Christian Giguere
    First written : 30th March, 1991 
    Last edited   : 17th December, 1993
    
    References:
    (1) B.R.Glasberg and B.C.J.Moore (1990). Hear Res 47: 103-138.
    (2) D.D.Greenwood (1990). JASA 87(6): 2592-2605.
    ===========================================================
*/


/***** includes *****/

#include  <math.h>
#include  "formulae_tl.h"

/***** functions *****/

/****************************************************************************
* name:             comments:
*
* SetERBscaling()   Stores a new value for the length of one critical-band
*                   unit, i.e. the distance along the basilar membrane 
*                   corresponding to one critical band. 
*
*                   Use:
*                   0.89 mm for ERB function of Glasberg and Moore (1990)
*                   1.00 mm for frequency-position function of Greenwood (1990)
*
* GetERBscaling()   Returns the length of one critical-band unit.
****************************************************************************/

static double mmperERB = 0.89 ;      /* millimeters per critical band */
                                     /* Default = 0.89 (ERB) */

void SetERBscaling( new_mmperERB )
double new_mmperERB ;
{
    mmperERB = new_mmperERB ;

    return ;
}


double GetERBscaling( )
{
    return ( mmperERB ) ;
}