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#include "ref.h"
void ref_std_f32(
float32_t * pSrc,
uint32_t blockSize,
float32_t * pResult)
{
uint32_t i;
float32_t sum=0, sumsq=0;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
sum += pSrc[i];
sumsq += pSrc[i] * pSrc[i];
}
*pResult = sqrtf((sumsq - sum * sum / (float32_t)blockSize) / ((float32_t)blockSize - 1));
}
void ref_std_q31(
q31_t * pSrc,
uint32_t blockSize,
q31_t * pResult)
{
uint32_t i;
q63_t sum=0, sumsq=0;
q31_t in;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
in = pSrc[i] >> 8;
sum += in;
sumsq += (q63_t)in * in;
}
sumsq /= (q63_t)(blockSize - 1);
sum = sum * sum / (q63_t)(blockSize * (blockSize - 1));
*pResult = (q31_t)(sqrtf((float)( (sumsq - sum) >> 15) / 2147483648.0f ) * 2147483648.0f);
}
void ref_std_q15(
q15_t * pSrc,
uint32_t blockSize,
q15_t * pResult)
{
uint32_t i;
q31_t sum=0;
q63_t sumsq=0;
if (blockSize == 1)
{
*pResult = 0;
return;
}
for(i=0;i<blockSize;i++)
{
sum += pSrc[i];
sumsq += (q63_t)pSrc[i] * pSrc[i];
}
sumsq /= (q63_t)(blockSize - 1);
sum = (q31_t)((q63_t)sum * sum / (q63_t)(blockSize * (blockSize - 1)));
*pResult = (q15_t)(sqrtf((float)ref_sat_q15( (sumsq - sum) >> 15) / 32768.0f ) * 32768.0f);
}
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