goertzel.h

来自「TMS320C5416算法程序包。其中包括FFT」· C头文件 代码 · 共 61 行

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/* FILENAME                                                                  */ 
/* 	goertzel.h                                                               */                           
/*                                                                           */
/* DESCRIPTION                                                               */
/*   Header file for Goertzel algorithm.                                     */
/*                                                                           */
/* REVISION                                                                  */
/*   Revision: 1.00	                                                         */ 
/*   Author  : Richard Sikora                                                */ 
/*---------------------------------------------------------------------------*/
/*                                                                           */
/* HISTORY                                                                   */
/*   Revision 1.00                                                           */
/*   6th December 2002. Created by Richard Sikora.                           */
/*                                                                           */
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#ifndef GOERTZEL_H
#define GOERTZEL_H

 #define COEFFICIENT_697_Hz  27906
 #define COEFFICIENT_770_Hz  26801
 #define COEFFICIENT_852_Hz  25596
 #define COEFFICIENT_941_Hz  24295 
 
 #define COEFFICIENT_1209_Hz 19056
 #define COEFFICIENT_1336_Hz 16528
 #define COEFFICIENT_1477_Hz 12944
 #define COEFFICIENT_1633_Hz  9166

 #define GOERTZEL_THRESHOLD 0x2000 

 /* The following are the bit masks corresponding to each button push */

 #define BUTTON_1    0x0011
 #define BUTTON_2    0x0021
 #define BUTTON_3    0x0041
 #define BUTTON_4    0x0012
 #define BUTTON_5    0x0022
 #define BUTTON_6    0x0042
 #define BUTTON_7    0x0014
 #define BUTTON_8    0x0024
 #define BUTTON_9    0x0044
 #define BUTTON_STAR 0x0018
 #define BUTTON_0    0x0028
 #define BUTTON_HASH 0x0048

 void goertzel_filter( short int * delay, short int input, short int coefficient );
  
 short int calculate_goertzel_output( short int * delay, short int coefficient );
 
 short int goertzel_value ( short int input, short int coefficient);

#endif

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/* End of goertzel.h                                                         */
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