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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | mjames | 1 | #include "ref.h" |
| 2 | |||
| 3 | void ref_std_f32( |
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| 4 | float32_t * pSrc, |
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| 5 | uint32_t blockSize, |
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| 6 | float32_t * pResult) |
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| 7 | { |
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| 8 | uint32_t i; |
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| 9 | float32_t sum=0, sumsq=0; |
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| 10 | |||
| 11 | if (blockSize == 1) |
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| 12 | { |
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| 13 | *pResult = 0; |
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| 14 | return; |
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| 15 | } |
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| 16 | |||
| 17 | for(i=0;i<blockSize;i++) |
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| 18 | { |
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| 19 | sum += pSrc[i]; |
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| 20 | sumsq += pSrc[i] * pSrc[i]; |
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| 21 | } |
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| 22 | *pResult = sqrtf((sumsq - sum * sum / (float32_t)blockSize) / ((float32_t)blockSize - 1)); |
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| 23 | } |
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| 24 | |||
| 25 | void ref_std_q31( |
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| 26 | q31_t * pSrc, |
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| 27 | uint32_t blockSize, |
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| 28 | q31_t * pResult) |
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| 29 | { |
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| 30 | uint32_t i; |
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| 31 | q63_t sum=0, sumsq=0; |
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| 32 | q31_t in; |
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| 33 | |||
| 34 | if (blockSize == 1) |
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| 35 | { |
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| 36 | *pResult = 0; |
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| 37 | return; |
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| 38 | } |
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| 39 | |||
| 40 | for(i=0;i<blockSize;i++) |
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| 41 | { |
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| 42 | in = pSrc[i] >> 8; |
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| 43 | sum += in; |
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| 44 | sumsq += (q63_t)in * in; |
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| 45 | } |
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| 46 | sumsq /= (q63_t)(blockSize - 1); |
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| 47 | sum = sum * sum / (q63_t)(blockSize * (blockSize - 1)); |
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| 48 | *pResult = (q31_t)(sqrtf((float)( (sumsq - sum) >> 15) / 2147483648.0f ) * 2147483648.0f); |
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| 49 | } |
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| 50 | |||
| 51 | void ref_std_q15( |
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| 52 | q15_t * pSrc, |
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| 53 | uint32_t blockSize, |
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| 54 | q15_t * pResult) |
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| 55 | { |
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| 56 | uint32_t i; |
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| 57 | q31_t sum=0; |
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| 58 | q63_t sumsq=0; |
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| 59 | |||
| 60 | if (blockSize == 1) |
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| 61 | { |
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| 62 | *pResult = 0; |
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| 63 | return; |
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| 64 | } |
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| 65 | |||
| 66 | for(i=0;i<blockSize;i++) |
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| 67 | { |
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| 68 | sum += pSrc[i]; |
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| 69 | sumsq += (q63_t)pSrc[i] * pSrc[i]; |
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| 70 | } |
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| 71 | sumsq /= (q63_t)(blockSize - 1); |
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| 72 | sum = (q31_t)((q63_t)sum * sum / (q63_t)(blockSize * (blockSize - 1))); |
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| 73 | *pResult = (q15_t)(sqrtf((float)ref_sat_q15( (sumsq - sum) >> 15) / 32768.0f ) * 32768.0f); |
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| 74 | } |