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