comparison 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 ) ;
+}
+