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asptRlslfpef32f
API Summary
API to create and delete an asptRlslfpef32f filter
API to filter and update an asptRlslfpef32f filter
API to retrieve the properties of an asptRlslfpef32f filter
- DT32S rlslfpef32fGetCoef(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
- DT32S rlslfpef32fGetForwardParcors(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
- DT32S rlslfpef32fGetBackwardParcors(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
- DT32S rlslfpef32fGetDelayLine(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
- rlslfpef32fGetCoefPtr( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetForwardParcorPtr( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetBackwardParcorPtr( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetDelayLinePtr( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetFilterLength( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetForgetFactor( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetLastErrorSample( asptRlslfpef32f
*rlsl )
- rlslfpef32fGetFirFlag( asptRlslfpef32f
*rlsl )
API to set the properties of an asptRlslfpef32f filter
Description
Implements the Recursive Least Squares Lattice Backward Prediction Error Filter using the a posteriori estimation errors.
Copyright
Copyright (c) DSP ALGORITHMS 2003; all rights reserved.
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rlslfpef32fInit
DT32S rlslfpef32fInit(asptRlslfpef32f *rlsl, DT32S L, DT32F mu)
Initializes an asptRlslfpef32f filter and allocates its necessary storage buffers - Returns :
-
Error code. On failure, the filterLength member of the filter is set to zero.
- Input Parameters :
- rlsl : pointer to asptRlslfpef32f filter to be initializes
- L : number of lattice stages
- mu : forgetting factor
- Output Parameters :
- rlsl is initialized using the given input arguments.
- Error Conditions
- ASPT_NO_ERR : Initialization is successful
- ASPT_NULL_PTR_ERR : rlsl is a NULL pointer
- ASPT_RANGE_ERR : L is not a valid input value
- ASPT_NO_MEM_ERR : could not allocate memory
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rlslfpef32fInitStatic
DT32S rlslfpef32fInitStatic(asptRlslfpef32f *rlsl, DT32S L, DT32F mu, DT32F *pCof, DT32F *pDat)
Initializes an asptRlslfpef32f filter to use pre-allocated memory blocks - Returns :
-
Error code. On failure, the filterLength member of the filter is set to zero.
- Input Parameters :
- rlsl : pointer to asptRlslfpef32f filter to be initialized
- L : number of lattice stages
- mu : forgetting factor
- pCof : pointer to a pre-allocated memory in program memory
of at least [3*L] DT32F locations to be used for the filter/PARCOR coefficients.
- pDat : pointer to a pre-allocated memory in data memory of at least
[5*L] DT32F locations to be used for data storage.
- Output Parameters :
- rlsl is initialized using the given input arguments.
- Error Conditions
- ASPT_NO_ERR : Initialization is successful
- ASPT_NULL_PTR_ERR : rlsl/pCof/pDat is a NULL pointer
- ASPT_RANGE_ERR : len is not a valid input value
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rlslfpef32fFilterUpdate
DT32F rlslfpef32fFilterUpdate(asptRlslfpef32f *rlsl, DT32F x)
Calculates the filter output and updates the PARCOR and linear combiner coefficients of an asptRlslfpef32f filter. - Returns :
- Input Parameters :
- rlsl : pointer to asptRlslfpef32f filter.
- x : input sample.
- d : desired sample.
- Remarks :
-
The error sample is stored internally and can be retrieved by calling rlslfpef32fGetLastErrorSample().
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rlslfpef32fFilterOnly
DT32F rlslfpef32fFilterOnly(asptRlslfpef32f *rlsl, DT32F x)
Calculates the filter output but does not updates the PARCOR nor the linear combiner coefficients. It also updates the internal buffers. - Returns :
- Input Parameters :
- rlsl : pointer to asptRlslfpef32f filter.
- x : input sample.
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rlslfpef32fFree
void rlslfpef32fFree(asptRlslfpef32f *rlsl)
Frees the allocated memory for this asptRlslfpef32f filter. - Returns :
- Input Parameters :
- rlsl : pointer to the asptRlslfpef32f filter
- Remarks :
-
Use this function only for asptRlslfpef32f filters created using rlslfpef32fInit(). Do not use with filters created with rlsLattice32fInitStatic().
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rlslfpef32fReset
DT32S rlslfpef32fReset(asptRlslfpef32f *rlsl)
Resets all internal filter states to pre-defined initial state.- Returns :
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter to be reset
- Error Conditions
- ASPT_NO_ERR : success
- ASPT_NULL_PTR_ERR : NULL pointer error
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rlslfpef32fGetCoef
DT32S rlslfpef32fGetCoef(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
Copies N internal linear combiner coefficients starting from coef[ind] to dstBuf. - Returns :
-
On success returns the number of coefficients copied, otherwise the error code (negative DT32S).
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter.
- dstBuf : pointer to the destination buffer.
- ind : index to the first coefficient to be copied.
- N : number of coefficients to be copied.
- flip : if 1, will flip the coefficients order
- Error Conditions
- ASPT_NULL_PTR_ERR : dstBuf/rlsl is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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rlslfpef32fGetForwardParcors
DT32S rlslfpef32fGetForwardParcors(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
Copies N internal forward PARKOR coefficients starting from coef[ind] to dstBuf. - Returns :
-
On success returns the number of coefficients copied, otherwise the error code (negative DT32S).
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter.
- dstBuf : pointer to the destination buffer.
- ind : index to the first coefficient to be copied.
- N : number of coefficients to be copied.
- flip : if 1, will flip the coefficients order
- Error Conditions
- ASPT_NULL_PTR_ERR : dstBuf/rlsl is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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rlslfpef32fGetBackwardParcors
DT32S rlslfpef32fGetBackwardParcors(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
Copies N internal backward PARKOR coefficients starting from coef[ind] to dstBuf. - Returns :
-
On success returns the number of coefficients copied, otherwise the error code (negative DT32S).
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter.
- dstBuf : pointer to the destination buffer.
- ind : index to the first coefficient to be copied.
- N : number of coefficients to be copied.
- flip : if 1, will flip the coefficients order
- Error Conditions
- ASPT_NULL_PTR_ERR : dstBuf/rlsl is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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rlslfpef32fGetDelayLine
DT32S rlslfpef32fGetDelayLine(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
Copies the N internal backward prediction error samples starting from delayLine[ind] sample to the given array. - Returns :
-
On success returns the number of samples copied, otherwise the error code (negative DT32S).
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter.
- dstBuf : pointer to the destination buffer.
- ind : index to the first sample to be copied.
- N : number of samples to be copied.
- flip : if 1, will flip the samples order.
- Error Conditions
- ASPT_NULL_PTR_ERR : newCoef/rlsl is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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rlslfpef32fSetDelayLine
DT32S rlslfpef32fSetDelayLine(asptRlslfpef32f *rlsl, DT32F *buf, DT32S ind, DT32S N, DT32S flip)
Initializes N internal backward prediction error samples starting from delayLine[ind] to the contents of newBuf. - Returns :
-
On success returns the number of samples copied, otherwise the error code (negative DT32S).
- Input Parameters :
- rlsl : pointer to an asptRlslfpef32f filter to be set.
- newBuf : pointer to the new PARCOR vector.
- ind : index to the first coefficient to be set.
- N : number of coefficients to be set.
- flip : if 1, will flip the coefficients order.
- Error Conditions
- ASPT_NULL_PTR_ERR : newBuf/rlsl is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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rlslfpef32fResize
DT32S rlslfpef32fResize(asptRlslfpef32f *rlsl, DT32S newLength)
Resizes an asptRlslfpef32f filter keeping as much of the filter state as possible. - Returns :
- Input Parameters :
- rlsl : pointer to the asptRlslfpef32f filter to be resized.
- newLen : required new filter length.
- Error Conditions
- ASPT_NO_ERR : Resizing is successful
- ASPT_NULL_PTR_ERR : NULL pointer error
- ASPT_RANGE_ERR : newLength is not a valid input value
- ASPT_NO_MEM_ERR : Could not allocate the necessary filter storage
- Remarks :
-
Use this function only with dynamically allocated asptRlslfpef32f filters.