再问SVPWM的问题

#include "IQmathLib.h"         // Include header for IQmath library
// Don't forget to set a proper GLOBAL_Q in "IQmathLib.h" file
#include "vhzprof.h"
#include <stdlib.h>

void vhz_prof_calc(VHZPROF *v)
{ 
 _iq VfSlope, AbsFreq;

// Take absolute frequency to allow the operation of both rotational directions
    AbsFreq = labs(v->Freq);

 if (AbsFreq <= v->LowFreq)  
        // Compute output voltage in profile #1
        v->VoltOut = v->VoltMin;
 else if ((AbsFreq > v->LowFreq)&(AbsFreq <= v->HighFreq))     
       {
        // Compute slope of V/f profile
        VfSlope = _IQdiv((v->VoltMax - v->VoltMin),(v->HighFreq - v->LowFreq));
        // Compute output voltage in profile #2
        v->VoltOut = v->VoltMin + _IQmpy(VfSlope,(AbsFreq-v->LowFreq));
       }
    else if ((AbsFreq > v->HighFreq)&(AbsFreq < v->FreqMax))     
        // Compute output voltage in profile #3
        v->VoltOut = v->VoltMax;
}

请问高手，以上代码是干什么用的？谢谢！