tomwalters@0: /*
tomwalters@0:     Copyright (c) Applied Psychology Unit, Medical Research Council. 1988, 1989
tomwalters@0:     ===========================================================================
tomwalters@0: 
tomwalters@0:     Permission to use, copy, modify, and distribute this software without fee 
tomwalters@0:     is hereby granted for research purposes, provided that this copyright 
tomwalters@0:     notice appears in all copies and in all supporting documentation, and that 
tomwalters@0:     the software is not redistributed for any fee (except for a nominal shipping 
tomwalters@0:     charge). Anyone wanting to incorporate all or part of this software in a
tomwalters@0:     commercial product must obtain a license from the Medical Research Council.
tomwalters@0: 
tomwalters@0:     The MRC makes no representations about the suitability of this 
tomwalters@0:     software for any purpose.  It is provided "as is" without express or implied 
tomwalters@0:     warranty.
tomwalters@0:  
tomwalters@0:     THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 
tomwalters@0:     ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE
tomwalters@0:     A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY 
tomwalters@0:     DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
tomwalters@0:     AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
tomwalters@0:     OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
tomwalters@0: */
tomwalters@0: 
tomwalters@0: /*
tomwalters@0: 
tomwalters@0: 	 ==============================================================
tomwalters@0: 	  gamma_tone.h - portable recursive auditory filter bank code.
tomwalters@0: 	 ==============================================================
tomwalters@0: 
tomwalters@0: 		   J. Holdsworth - 23rd February 1988.
tomwalters@0: 
tomwalters@0: 
tomwalters@0:     Copywright (c) Applied Psychology Unit, Medical Research Council. 1988.
tomwalters@0:     =======================================================================
tomwalters@0: 
tomwalters@0: 
tomwalters@0:     Release 2: 5th July 1988.
tomwalters@0:     Release 3: 20th September 1988.
tomwalters@0:     Rewrite :  21st January 1988.
tomwalters@0: 
tomwalters@0: */
tomwalters@0: 
tomwalters@0: #define   _GAMMA_TONE_H_
tomwalters@0: 
tomwalters@0: #define   GT_IDENT_STRING    "@(#)gamma_tone.h	1.5 J. Holdsworth (MRC-APU) 1/30/90\n"
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /* number of bits significant in input data */
tomwalters@0: 
tomwalters@0: #define   bits_significant   12
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /* structure storing information common to all channels in filter */
tomwalters@0: 
tomwalters@0: typedef struct _bank_info FilterBankInfo, *FilterBankInfoPtr ;
tomwalters@0: 
tomwalters@0: struct _bank_info { double samplerate, b_scalar, max_desired_advance_time ;
tomwalters@0: 	   int order, phase_comp ; } ;
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /* structure storing information specific to state of particualr channel's filter */
tomwalters@0: 
tomwalters@0: typedef char FilterChannelInfo, *FilterChannelInfoPtr ;
tomwalters@0: 
tomwalters@0: 
tomwalters@0: extern double *GenerateCenterFrequencies(
tomwalters@0: #ifdef vaxc
tomwalters@0: double min_cf, double max_cf, double erb_density
tomwalters@0: #endif
tomwalters@0: ) ;
tomwalters@0: 
tomwalters@0: extern int NumberCenterFrequencies(
tomwalters@0: #ifdef vaxc
tomwalters@0: int min_cf, double max_cf, double erb_density
tomwalters@0: #endif
tomwalters@0: ) ;
tomwalters@0: 
tomwalters@0: extern double *NumberedCenterFrequencies(
tomwalters@0: #ifdef vaxc
tomwalters@0: double min_cf, double max_cf, int channels
tomwalters@0: #endif
tomwalters@0: ) ;
tomwalters@0: 
tomwalters@0: extern  double bandwidth_normalisation() ;
tomwalters@0: 
tomwalters@0: 
tomwalters@0: extern  FilterBankInfo    *InitGammaToneFilterBank() ;
tomwalters@0: extern  FilterChannelInfo *InitGammaToneFilterChannel() ;
tomwalters@0: extern  void EndChannel() ;
tomwalters@0: extern  void EndFilter() ;
tomwalters@0: 
tomwalters@0: extern  int FilterShortDataArray() ;
tomwalters@0: extern  int RealFilterShortDataArray() ;
tomwalters@0: extern  int FilterIntDataArray() ;
tomwalters@0: extern  int RealFilterIntDataArray() ;
tomwalters@0: extern  int RealFilterDoubleDataArray() ;
tomwalters@0: 
tomwalters@0: /* envelope functions */
tomwalters@0: 
tomwalters@0: extern  int EnvelopeShortDataArray() ;
tomwalters@0: extern  int RealEnvelopeShortDataArray() ;
tomwalters@0: 
tomwalters@0: 
tomwalters@0: /* for compatability with release 1 */
tomwalters@0: 
tomwalters@0: #define  InitGammaToneFilter InitGammaToneFilterBank
tomwalters@0: #define  FilterDataArray     FilterShortDataArray
tomwalters@0: #define  erb( _f )           Erb( _f )
tomwalters@0: #define  erb_rate( _f )      ErbRate( _f )
tomwalters@0: #define  f_of_erb_rate( _E ) FofErbRate( _E )
tomwalters@0: #define  bandwidth_divisor   bandwidth_normalisation
tomwalters@0: 
tomwalters@0: /* missing parameters availiable as globl variables */
tomwalters@0: 
tomwalters@0: extern double filterDefaultGain ;
tomwalters@0: extern int filterDefaultInputBits ;