www.pudn.com > SMV_Code.rar > dtmf_gen.c

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/*===================================================================*/ 
 
 
#include  
#include  
#include "tables.h" 
#include "typedef.h" 
#include "tty.h" 
 
 
void  
dtmf_tone_gen ( 
		short dtmf_digit,	/* (i) digit in Q14                  */ 
		short dtmf_digit_last,	/* (i) last digit                    */ 
		short Num,	        /* size of frame                     */ 
		FLOAT64  sigout[]	/* (o) output                         */ 
) 
{ 
 
  int i; 
  static short tone_param_dtmf1[3]; 
  static short tone_param_dtmf2[3]; 
  short sigout_16[Num]; 
 
  if (dtmf_digit != dtmf_digit_last) 
    init_tone_gen (tone_param_dtmf1, 
		   dtmf_low_freq[dtmf_digit]); 
 
 
/*-------------------------------------------------------*/ 
  /*                  Generate low tone                    */ 
/*-------------------------------------------------------*/ 
 
  tone_gen (sigout_16, dtmf_low_freq[dtmf_digit], DTMF_GAIN, 
	    Num, tone_param_dtmf1); 
 
  for (i = 0; i < Num; i++) 
    sigout[i] = (FLOAT64) sigout_16[i]; 
 
  if (dtmf_digit != dtmf_digit_last) 
    init_tone_gen (tone_param_dtmf2, 
		   dtmf_high_freq[dtmf_digit]); 
 
/*-------------------------------------------------------*/ 
  /*                     Generate high tone                */ 
/*-------------------------------------------------------*/ 
 
  tone_gen (sigout_16, dtmf_high_freq[dtmf_digit], 
	    DTMF_GAIN, Num, tone_param_dtmf2); 
 
  for (i = 0; i < Num; i++) 
    sigout[i] += (FLOAT64) sigout_16[i]; 
 
 
 
}