#include "ref.h"
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void ref_lms_f32(
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const arm_lms_instance_f32 * S,
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float32_t * pSrc,
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float32_t * pRef,
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float32_t * pOut,
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float32_t * pErr,
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uint32_t blockSize)
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{
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float32_t *pState = S->pState; /* State pointer */
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float32_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
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float32_t *pStateCurnt; /* Points to the current sample of the state */
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float32_t mu = S->mu; /* Adaptive factor */
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uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
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uint32_t i, blkCnt; /* Loop counters */
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float32_t sum, e, d; /* accumulator, error, reference data sample */
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float32_t w = 0.0f; /* weight factor */
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e = 0.0f;
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d = 0.0f;
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/* S->pState points to state array which contains previous frame (numTaps - 1) samples */
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/* pStateCurnt points to the location where the new input data should be written */
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pStateCurnt = &(S->pState[numTaps - 1U]);
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blkCnt = blockSize;
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while (blkCnt > 0U)
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{
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/* Copy the new input sample into the state buffer */
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*pStateCurnt++ = *pSrc++;
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/* Set the accumulator to zero */
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sum = 0.0f;
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for(i=0;i<numTaps;i++)
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{ /* Perform the multiply-accumulate */
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sum += pState[i] * pCoeffs[i];
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}
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/* The result is stored in the destination buffer. */
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*pOut++ = sum;
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/* Compute and store error */
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d = *pRef++;
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e = d - sum;
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*pErr++ = e;
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/* Weighting factor for the LMS version */
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w = e * mu;
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for(i=0;i<numTaps;i++)
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{ /* Perform the multiply-accumulate */
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pCoeffs[i] += w * pState[i];
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}
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/* Advance state pointer by 1 for the next sample */
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pState++;
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/* Decrement the loop counter */
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blkCnt--;
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}
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/* Processing is complete. Now copy the last numTaps - 1 samples to the
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* start of the state buffer. This prepares the state buffer for the
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* next function call. */
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for(i=0;i<numTaps-1;i++)
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{
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S->pState[i] = pState[i];
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}
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}
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void ref_lms_norm_f32(
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arm_lms_norm_instance_f32 * S,
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float32_t * pSrc,
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float32_t * pRef,
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float32_t * pOut,
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float32_t * pErr,
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uint32_t blockSize)
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{
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float32_t *pState = S->pState; /* State pointer */
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float32_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
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float32_t *pStateCurnt; /* Points to the current sample of the state */
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float32_t mu = S->mu; /* Adaptive factor */
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uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
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uint32_t i, blkCnt; /* Loop counters */
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float32_t energy; /* Energy of the input */
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float32_t sum, e, d; /* accumulator, error, reference data sample */
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float32_t w, x0, in; /* weight factor, temporary variable to hold input sample and state */
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/* Initializations of error, difference, Coefficient update */
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e = 0.0f;
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d = 0.0f;
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w = 0.0f;
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energy = S->energy;
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x0 = S->x0;
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/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */
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/* pStateCurnt points to the location where the new input data should be written */
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pStateCurnt = &(S->pState[numTaps - 1U]);
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for(blkCnt = blockSize; blkCnt > 0U; blkCnt--)
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{
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/* Copy the new input sample into the state buffer */
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*pStateCurnt++ = *pSrc;
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/* Read the sample from input buffer */
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in = *pSrc++;
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/* Update the energy calculation */
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energy -= x0 * x0;
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energy += in * in;
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/* Set the accumulator to zero */
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sum = 0.0f;
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for(i=0;i<numTaps;i++)
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{ /* Perform the multiply-accumulate */
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sum += pState[i] * pCoeffs[i];
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}
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/* The result in the accumulator is stored in the destination buffer. */
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*pOut++ = sum;
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/* Compute and store error */
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d = *pRef++;
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e = d - sum;
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*pErr++ = e;
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/* Calculation of Weighting factor for updating filter coefficients */
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/* epsilon value 0.000000119209289f */
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w = e * mu / (energy + 0.000000119209289f);
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for(i=0;i<numTaps;i++)
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{
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/* Perform the multiply-accumulate */
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pCoeffs[i] += w * pState[i];
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}
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x0 = *pState;
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/* Advance state pointer by 1 for the next sample */
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pState++;
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}
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S->energy = energy;
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S->x0 = x0;
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/* Processing is complete. Now copy the last numTaps - 1 samples to the
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* start of the state buffer. This prepares the state buffer for the
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* next function call. */
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for(i=0;i<numTaps-1;i++)
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{
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S->pState[i] = pState[i];
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}
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}
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void ref_lms_q31(
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const arm_lms_instance_q31 * S,
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q31_t * pSrc,
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q31_t * pRef,
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q31_t * pOut,
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q31_t * pErr,
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uint32_t blockSize)
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{
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q31_t *pState = S->pState; /* State pointer */
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uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
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q31_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
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q31_t *pStateCurnt; /* Points to the current sample of the state */
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q31_t mu = S->mu; /* Adaptive factor */
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q31_t *px; /* Temporary pointer for state */
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q31_t *pb; /* Temporary pointer for coefficient buffer */
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uint32_t tapCnt, blkCnt; /* Loop counters */
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q63_t acc; /* Accumulator */
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q31_t e = 0; /* error of data sample */
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q31_t alpha; /* Intermediate constant for taps update */
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q31_t coef; /* Temporary variable for coef */
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q31_t acc_l, acc_h; /* temporary input */
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uint32_t uShift = (uint32_t)S->postShift + 1;
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uint32_t lShift = 32U - uShift; /* Shift to be applied to the output */
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/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */
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/* pStateCurnt points to the location where the new input data should be written */
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pStateCurnt = &(S->pState[(numTaps - 1U)]);
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for(blkCnt = blockSize; blkCnt > 0U; blkCnt--)
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{
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/* Copy the new input sample into the state buffer */
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*pStateCurnt++ = *pSrc++;
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/* Initialize pState pointer */
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px = pState;
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/* Initialize pCoeffs pointer */
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pb = pCoeffs;
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/* Set the accumulator to zero */
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acc = 0;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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acc += (q63_t)(*px++) * (*pb++);
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/* Decrement the loop counter */
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tapCnt--;
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}
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/* Converting the result to 1.31 format */
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/* Store the result from accumulator into the destination buffer. */
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/* Calc lower part of acc */
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acc_l = acc & 0xffffffff;
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/* Calc upper part of acc */
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acc_h = (acc >> 32) & 0xffffffff;
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acc = (uint32_t)acc_l >> lShift | acc_h << uShift;
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*pOut++ = (q31_t)acc;
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/* Compute and store error */
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e = *pRef++ - (q31_t)acc;
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*pErr++ = (q31_t)e;
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/* Weighting factor for the LMS version */
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alpha = (q31_t)(((q63_t)e * mu) >> 31);
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/* Initialize pState pointer */
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/* Advance state pointer by 1 for the next sample */
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px = pState++;
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/* Initialize pCoeffs pointer */
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pb = pCoeffs;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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coef = (q31_t)(((q63_t) alpha * (*px++)) >> 32);
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*pb = ref_sat_q31((q63_t)*pb + (coef << 1));
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pb++;
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/* Decrement the loop counter */
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tapCnt--;
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}
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}
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/* Processing is complete. Now copy the last numTaps - 1 samples to the
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start of the state buffer. This prepares the state buffer for the
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next function call. */
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/* Points to the start of the pState buffer */
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pStateCurnt = S->pState;
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/* Copy (numTaps - 1U) samples */
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tapCnt = numTaps - 1;
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/* Copy the data */
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while (tapCnt > 0U)
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{
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*pStateCurnt++ = *pState++;
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/* Decrement the loop counter */
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tapCnt--;
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}
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}
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void ref_lms_norm_q31(
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arm_lms_norm_instance_q31 * S,
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q31_t * pSrc,
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q31_t * pRef,
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q31_t * pOut,
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q31_t * pErr,
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uint32_t blockSize)
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{
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q31_t *pState = S->pState; /* State pointer */
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q31_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
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q31_t *pStateCurnt; /* Points to the current sample of the state */
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q31_t *px, *pb; /* Temporary pointers for state and coefficient buffers */
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q31_t mu = S->mu; /* Adaptive factor */
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uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
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uint32_t tapCnt, blkCnt; /* Loop counters */
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q63_t energy; /* Energy of the input */
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q63_t acc; /* Accumulator */
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q31_t e = 0, d = 0; /* error, reference data sample */
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q31_t w = 0, in; /* weight factor and state */
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q31_t x0; /* temporary variable to hold input sample */
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q63_t errorXmu; /* Temporary variables to store error and mu product and reciprocal of energy */
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q31_t coef; /* Temporary variable for coef */
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q31_t acc_l, acc_h; /* temporary input */
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uint32_t uShift = ((uint32_t) S->postShift + 1U);
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uint32_t lShift = 32U - uShift; /* Shift to be applied to the output */
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energy = S->energy;
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x0 = S->x0;
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/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */
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/* pStateCurnt points to the location where the new input data should be written */
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pStateCurnt = &(S->pState[(numTaps - 1U)]);
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for(blkCnt = blockSize; blkCnt > 0U; blkCnt--)
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{
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/* Copy the new input sample into the state buffer */
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*pStateCurnt++ = *pSrc;
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/* Initialize pState pointer */
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px = pState;
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/* Initialize pCoeffs pointer */
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pb = pCoeffs;
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/* Read the sample from input buffer */
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in = *pSrc++;
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/* Update the energy calculation */
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energy = (q31_t)((((q63_t)energy << 32) - (((q63_t)x0 * x0) << 1)) >> 32) & 0xffffffff;
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energy = (q31_t)(((((q63_t)in * in) << 1) + ((q63_t)energy << 32)) >> 32) & 0xffffffff;
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/* Set the accumulator to zero */
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acc = 0;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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acc += ((q63_t) (*px++)) * (*pb++);
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/* Decrement the loop counter */
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tapCnt--;
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}
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/* Converting the result to 1.31 format */
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/* Calc lower part of acc */
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acc_l = acc & 0xffffffff;
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/* Calc upper part of acc */
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acc_h = (acc >> 32) & 0xffffffff;
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acc = (uint32_t)acc_l >> lShift | acc_h << uShift;
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/* Store the result from accumulator into the destination buffer. */
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*pOut++ = (q31_t)acc;
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/* Compute and store error */
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d = *pRef++;
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e = d - (q31_t)acc;
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*pErr++ = e;
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/* Calculation of product of (e * mu) */
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errorXmu = (q63_t)e * mu;
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/* Weighting factor for the normalized version */
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w = ref_sat_q31(errorXmu / (energy + DELTA_Q31));
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/* Initialize pState pointer */
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px = pState;
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/* Initialize coeff pointer */
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pb = pCoeffs;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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/* coef is in 2.30 format */
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coef = (q31_t)(((q63_t)w * (*px++)) >> 32);
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/* get coef in 1.31 format by left shifting */
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*pb = ref_sat_q31((q63_t)*pb + (coef << 1U));
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/* update coefficient buffer to next coefficient */
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pb++;
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/* Decrement the loop counter */
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tapCnt--;
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}
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/* Read the sample from state buffer */
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x0 = *pState;
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/* Advance state pointer by 1 for the next sample */
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pState++;
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}
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/* Save energy and x0 values for the next frame */
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S->energy = (q31_t)energy;
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S->x0 = x0;
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/* Processing is complete. Now copy the last numTaps - 1 samples to the
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start of the state buffer. This prepares the state buffer for the
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next function call. */
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/* Points to the start of the pState buffer */
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pStateCurnt = S->pState;
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/* Loop for (numTaps - 1U) samples copy */
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tapCnt = numTaps - 1;
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/* Copy the remaining q31_t data */
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while (tapCnt > 0U)
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{
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*pStateCurnt++ = *pState++;
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/* Decrement the loop counter */
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tapCnt--;
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}
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}
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void ref_lms_q15(
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const arm_lms_instance_q15 * S,
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q15_t * pSrc,
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q15_t * pRef,
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q15_t * pOut,
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q15_t * pErr,
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uint32_t blockSize)
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{
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q15_t *pState = S->pState; /* State pointer */
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uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
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q15_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
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q15_t *pStateCurnt; /* Points to the current sample of the state */
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q15_t mu = S->mu; /* Adaptive factor */
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q15_t *px; /* Temporary pointer for state */
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q15_t *pb; /* Temporary pointer for coefficient buffer */
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uint32_t tapCnt, blkCnt; /* Loop counters */
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q63_t acc; /* Accumulator */
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q15_t e = 0; /* error of data sample */
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q15_t alpha; /* Intermediate constant for taps update */
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q31_t coef; /* Teporary variable for coefficient */
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q31_t acc_l, acc_h;
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int32_t lShift = 15 - (int32_t)S->postShift; /* Post shift */
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int32_t uShift = 32 - lShift;
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/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */
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/* pStateCurnt points to the location where the new input data should be written */
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pStateCurnt = &(S->pState[(numTaps - 1U)]);
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for(blkCnt = blockSize; blkCnt > 0U; blkCnt--)
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{
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/* Copy the new input sample into the state buffer */
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*pStateCurnt++ = *pSrc++;
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/* Initialize pState pointer */
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px = pState;
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/* Initialize pCoeffs pointer */
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pb = pCoeffs;
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/* Set the accumulator to zero */
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acc = 0;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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acc += (q63_t)((q31_t)(*px++) * (*pb++));
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/* Decrement the loop counter */
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tapCnt--;
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}
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/* Calc lower part of acc */
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acc_l = acc & 0xffffffff;
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/* Calc upper part of acc */
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acc_h = (acc >> 32) & 0xffffffff;
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/* Apply shift for lower part of acc and upper part of acc */
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acc = (uint32_t)acc_l >> lShift | acc_h << uShift;
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/* Converting the result to 1.15 format and saturate the output */
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acc = ref_sat_q15(acc);
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/* Store the result from accumulator into the destination buffer. */
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*pOut++ = (q15_t)acc;
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/* Compute and store error */
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e = *pRef++ - (q15_t)acc;
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*pErr++ = (q15_t)e;
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/* Compute alpha i.e. intermediate constant for taps update */
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alpha = (q15_t)(((q31_t)e * mu) >> 15);
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/* Initialize pState pointer */
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/* Advance state pointer by 1 for the next sample */
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px = pState++;
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/* Initialize pCoeffs pointer */
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pb = pCoeffs;
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/* Loop over numTaps number of values */
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tapCnt = numTaps;
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while (tapCnt > 0U)
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{
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/* Perform the multiply-accumulate */
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coef = (q31_t) * pb + (((q31_t) alpha * (*px++)) >> 15);
|
*pb++ = (q15_t) ref_sat_q15(coef);
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/* Decrement the loop counter */
|
tapCnt--;
|
}
|
}
|
|
/* Processing is complete. Now copy the last numTaps - 1 samples to the
|
start of the state buffer. This prepares the state buffer for the
|
next function call. */
|
|
/* Points to the start of the pState buffer */
|
pStateCurnt = S->pState;
|
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/* Copy (numTaps - 1U) samples */
|
tapCnt = numTaps - 1;
|
|
/* Copy the data */
|
while (tapCnt > 0U)
|
{
|
*pStateCurnt++ = *pState++;
|
|
/* Decrement the loop counter */
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tapCnt--;
|
}
|
}
|
|
void ref_lms_norm_q15(
|
arm_lms_norm_instance_q15 * S,
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q15_t * pSrc,
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q15_t * pRef,
|
q15_t * pOut,
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q15_t * pErr,
|
uint32_t blockSize)
|
{
|
q15_t *pState = S->pState; /* State pointer */
|
q15_t *pCoeffs = S->pCoeffs; /* Coefficient pointer */
|
q15_t *pStateCurnt; /* Points to the current sample of the state */
|
q15_t *px, *pb; /* Temporary pointers for state and coefficient buffers */
|
q15_t mu = S->mu; /* Adaptive factor */
|
uint32_t numTaps = S->numTaps; /* Number of filter coefficients in the filter */
|
uint32_t tapCnt, blkCnt; /* Loop counters */
|
q31_t energy; /* Energy of the input */
|
q63_t acc; /* Accumulator */
|
q15_t e = 0, d = 0; /* error, reference data sample */
|
q15_t w = 0, in; /* weight factor and state */
|
q15_t x0; /* temporary variable to hold input sample */
|
q15_t errorXmu, oneByEnergy; /* Temporary variables to store error and mu product and reciprocal of energy */
|
//q31_t errorXmu; /* Temporary variables to store error and mu product and reciprocal of energy */
|
q15_t postShift; /* Post shift to be applied to weight after reciprocal calculation */
|
q31_t coef; /* Teporary variable for coefficient */
|
q31_t acc_l, acc_h;
|
int32_t lShift = 15 - (int32_t)S->postShift; /* Post shift */
|
int32_t uShift = 32 - lShift;
|
|
energy = S->energy;
|
x0 = S->x0;
|
|
/* S->pState points to buffer which contains previous frame (numTaps - 1) samples */
|
/* pStateCurnt points to the location where the new input data should be written */
|
pStateCurnt = &(S->pState[(numTaps - 1U)]);
|
|
for(blkCnt = blockSize; blkCnt > 0U; blkCnt--)
|
{
|
/* Copy the new input sample into the state buffer */
|
*pStateCurnt++ = *pSrc;
|
|
/* Initialize pState pointer */
|
px = pState;
|
|
/* Initialize pCoeffs pointer */
|
pb = pCoeffs;
|
|
/* Read the sample from input buffer */
|
in = *pSrc++;
|
|
/* Update the energy calculation */
|
energy -= (((q31_t)x0 * x0) >> 15) & 0xffff;
|
energy += (((q31_t)in * in) >> 15) & 0xffff;
|
|
/* Set the accumulator to zero */
|
acc = 0;
|
|
/* Loop over numTaps number of values */
|
tapCnt = numTaps;
|
|
while (tapCnt > 0U)
|
{
|
/* Perform the multiply-accumulate */
|
acc += (q31_t)*px++ * (*pb++);
|
|
/* Decrement the loop counter */
|
tapCnt--;
|
}
|
|
/* Calc lower part of acc */
|
acc_l = acc & 0xffffffff;
|
|
/* Calc upper part of acc */
|
acc_h = (acc >> 32) & 0xffffffff;
|
|
/* Apply shift for lower part of acc and upper part of acc */
|
acc = (uint32_t) acc_l >> lShift | acc_h << uShift;
|
|
/* Converting the result to 1.15 format and saturate the output */
|
acc = ref_sat_q15(acc);
|
|
/* Store the result from accumulator into the destination buffer. */
|
*pOut++ = (q15_t) acc;
|
|
/* Compute and store error */
|
d = *pRef++;
|
e = d - (q15_t) acc;
|
*pErr++ = e;
|
|
#if 0
|
/* Calculation of e * mu value */
|
errorXmu = (q31_t) e * mu;
|
|
/* Calculation of (e * mu) /energy value */
|
acc = errorXmu / (energy + DELTA_Q15);
|
#endif
|
|
/* Calculation of 1/energy */
|
postShift = arm_recip_q15((q15_t) energy + DELTA_Q15,
|
&oneByEnergy, S->recipTable);
|
|
/* Calculation of e * mu value */
|
errorXmu = (q15_t) (((q31_t) e * mu) >> 15);
|
|
/* Calculation of (e * mu) * (1/energy) value */
|
acc = (((q31_t) errorXmu * oneByEnergy) >> (15 - postShift));
|
|
/* Weighting factor for the normalized version */
|
w = ref_sat_q15((q31_t)acc);
|
|
/* Initialize pState pointer */
|
px = pState;
|
|
/* Initialize coeff pointer */
|
pb = pCoeffs;
|
|
/* Loop over numTaps number of values */
|
tapCnt = numTaps;
|
|
while (tapCnt > 0U)
|
{
|
/* Perform the multiply-accumulate */
|
coef = *pb + (((q31_t)w * (*px++)) >> 15);
|
*pb++ = ref_sat_q15(coef);
|
|
/* Decrement the loop counter */
|
tapCnt--;
|
}
|
|
/* Read the sample from state buffer */
|
x0 = *pState;
|
|
/* Advance state pointer by 1 for the next sample */
|
pState = pState + 1U;
|
}
|
|
/* Save energy and x0 values for the next frame */
|
S->energy = (q15_t)energy;
|
S->x0 = x0;
|
|
/* Processing is complete. Now copy the last numTaps - 1 samples to the
|
satrt of the state buffer. This prepares the state buffer for the
|
next function call. */
|
|
/* Points to the start of the pState buffer */
|
pStateCurnt = S->pState;
|
|
/* copy (numTaps - 1U) data */
|
tapCnt = numTaps - 1;
|
|
/* copy data */
|
while (tapCnt > 0U)
|
{
|
*pStateCurnt++ = *pState++;
|
|
/* Decrement the loop counter */
|
tapCnt--;
|
}
|
}
|
