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annotate wdf/scales_tl.c @ 0:5242703e91d3 tip

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Initial checkin for AIM92 aimR8.2 (last updated May 1997).
author tomwalters
date Fri, 20 May 2011 15:19:45 +0100
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tomwalters@0 1 /*
tomwalters@0 2 Copyright (c) Applied Psychology Unit, Medical Research Council. 1988, 1989
tomwalters@0 3 ===========================================================================
tomwalters@0 4
tomwalters@0 5 Permission to use, copy, modify, and distribute this software without fee
tomwalters@0 6 is hereby granted for research purposes, provided that this copyright
tomwalters@0 7 notice appears in all copies and in all supporting documentation, and that
tomwalters@0 8 the software is not redistributed for any fee (except for a nominal shipping
tomwalters@0 9 charge). Anyone wanting to incorporate all or part of this software in a
tomwalters@0 10 commercial product must obtain a license from the Medical Research Council.
tomwalters@0 11
tomwalters@0 12 The MRC makes no representations about the suitability of this
tomwalters@0 13 software for any purpose. It is provided "as is" without express or implied
tomwalters@0 14 warranty.
tomwalters@0 15
tomwalters@0 16 THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
tomwalters@0 17 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE
tomwalters@0 18 A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
tomwalters@0 19 DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
tomwalters@0 20 AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
tomwalters@0 21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
tomwalters@0 22 */
tomwalters@0 23
tomwalters@0 24 /*
tomwalters@0 25 Acknowledgment:
tomwalters@0 26 ==============
tomwalters@0 27
tomwalters@0 28 The source code provided in this file was originally developed by
tomwalters@0 29 Christian Giguere as part of a Ph.D degree at the Department of
tomwalters@0 30 Engineering of the University of Cambridge from April 1990 to
tomwalters@0 31 November 1993. The code was subsequently adapted under a grant
tomwalters@0 32 from the Hearing Research Trust for full compatibility with
tomwalters@0 33 AIM Release 6.15.
tomwalters@0 34
tomwalters@0 35 Christian Giguere 25/03/94
tomwalters@0 36
tomwalters@0 37 */
tomwalters@0 38
tomwalters@0 39 /*
tomwalters@0 40 ===========================================================
tomwalters@0 41 scales_tl.c
tomwalters@0 42 ===========================================================
tomwalters@0 43
tomwalters@0 44 Supplements "scales.c"
tomwalters@0 45 (for use with WDF-TLF cochlear filterbank)
tomwalters@0 46
tomwalters@0 47 Author : Christian Giguere
tomwalters@0 48 First written : 29th March, 1991
tomwalters@0 49 Last edited :
tomwalters@0 50 ===========================================================
tomwalters@0 51 */
tomwalters@0 52
tomwalters@0 53
tomwalters@0 54 /***** includes *****/
tomwalters@0 55
tomwalters@0 56 #include "scales_tl.h"
tomwalters@0 57
tomwalters@0 58
tomwalters@0 59 /***** defines *****/
tomwalters@0 60
tomwalters@0 61
tomwalters@0 62 /***** functions *****/
tomwalters@0 63
tomwalters@0 64 /*************************************************************************
tomwalters@0 65 * DensityOnScale()
tomwalters@0 66 *
tomwalters@0 67 * Returns the density of channels of a filterbank (# per CB-rate unit).
tomwalters@0 68 *
tomwalters@0 69 * argument-name: comments:
tomwalters@0 70 * minOnScale minimum channel freq. on arbitrary linear scale
tomwalters@0 71 * maxOnScale maximum channel freq. on arbitrary linear scale
tomwalters@0 72 * channels total number of channels
tomwalters@0 73 **************************************************************************/
tomwalters@0 74
tomwalters@0 75 double DensityOnScale( minOnScale, maxOnScale, channels )
tomwalters@0 76 double minOnScale, maxOnScale ;
tomwalters@0 77 int channels ;
tomwalters@0 78 {
tomwalters@0 79 if( channels == 1 ) {
tomwalters@0 80
tomwalters@0 81 if( maxOnScale == minOnScale ) {
tomwalters@0 82
tomwalters@0 83 return ( 0. ) ; /* arbitrary */
tomwalters@0 84 }
tomwalters@0 85 else
tomwalters@0 86 return ( 1. / ( maxOnScale - minOnScale ) ) ;
tomwalters@0 87 }
tomwalters@0 88
tomwalters@0 89 else
tomwalters@0 90 return ( ( channels - 1. ) / ( maxOnScale - minOnScale ) ) ;
tomwalters@0 91
tomwalters@0 92 }