| #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); |
| } |