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asptBfdaf32f
API Summary
API to create and delete asptBfdaf32f filters
- DT32S bfdaf32fInit(asptBfdaf32f *bfdaf,DT32S M,DT32S L,DT32F mu,DT32S cs,DT32S *ip,DT32F *w)
- DT32S bfdaf32fInitStatic(asptBfdaf32f *bfdaf,DT32S M,DT32S L,DT32F mu,DT32S cs,DT32F *pCof,DT32F *pDat,DT32S *ip,DT32F *w)
- void bfdaf32fFree(asptBfdaf32f *bfdaf)
API to filter and update asptBfdaf32f filters
API to retrieve the properties of asptBfdaf32f filters
API to set the properties of asptBfdaf32f filters
Description
Implements the Block Frequency Domain Adaptive Filter (BFDAF) algorithm.
Copyright
Copyright (c) DSP ALGORITHMS 2003; all rights reserved.
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bfdaf32fInit
DT32S bfdaf32fInit(asptBfdaf32f *bfdaf,DT32S M,DT32S L,DT32F mu,DT32S cs,DT32S *ip,DT32F *w)
Initializes an asptBfdaf32f filter and allocates its necessary storage buffers - Returns :
-
Error code. On failure, the filterLength member of the filter is set to zero.
- Input Parameters :
- bfdaf : pointer to the asptbfdaf32f to be initialized
- M : number of time domain filter coefficients
- L : block length (number of new samples each block)
- mu : step size.
- cs : constrained (1) or unconstrained (0) filter.
- ip : fft bit reversal table
- w : fft twiddle factor table.
- Output Parameters :
- bfdaf is initialized using the given input arguments.
- Error Conditions
- ASPT_NO_ERR : Initialization is successful
- ASPT_NULL_PTR_ERR : ip/w is a NULL pointer
- ASPT_RANGE_ERR : L/M is not a valid input value
- ASPT_NO_MEM_ERR : could not allocate memory
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bfdaf32fInitStatic
DT32S bfdaf32fInitStatic(asptBfdaf32f *bfdaf,DT32S M,DT32S L,DT32F mu,DT32S cs,DT32F *pCof,DT32F *pDat,DT32S *ip,DT32F *w)
Initializes an asptBfdaf32f filter to use pre-allocated memory blocks - Returns :
-
Error code. On failure, the filterLength member of the filter is set to zero.
- Input Parameters :
- bfdaf : pointer to the asptbfdaf32f to be initialized
- M : number of time domain filter coefficients
- L : block length (number of new samples each block)
- mu : step size.
- cs : constrained (1) or unconstrained (0) filter.
- pCof : pointer to a pre-allocated memory in program memory
of at least [fftLength] DT32F locations to be used for the filter coefficients.
- pDat : pointer to a pre-allocated memory in data memory of at least
[C1 + 2*fftLength + 2*(fftLength/2+1)] DT32F locations to be used for data storage.
- ip : FFT bit reversal table
- w : FFT twiddle factor table.
- Output Parameters :
- bfdaf is initialized using the given input arguments.
- Error Conditions
- ASPT_NO_ERR : Initialization is successful
- ASPT_NULL_PTR_ERR : ip/w is a NULL pointer
- ASPT_RANGE_ERR : L/M is not a valid input value
- ASPT_NO_MEM_ERR : could not allocate memory
- Remarks :
-
fftLength = 2^(nextpow2(L+M-1)). C1 = fftLength - blockLength.
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bfdaf32fFilterUpdate
DT32S bfdaf32fFilterUpdate(asptBfdaf32f *bfdaf, DT32F *inp, DT32F *des, DT32F *out, DT32F *err)
Calculates the filter output and updates the filter coefficients for the asptBfdaf32f filter.- Returns :
- Input Parameters :
- bfdaf : asptBfdaf32f filter to be processed
- inp : pointer to the new block of input samples
- des : pointer to the new block of desired signal samples
- Output Parameters :
- out : pointer to an array to store the filter output samples
- err : pointer to store the error (des - out) samples.
- Error Conditions
- ASPT_NO_ERR : success
- ASPT_NULL_PTR_ERR : NULL pointer error
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bfdaf32fFilterOnly
DT32S bfdaf32fFilterOnly(asptBfdaf32f *bfdaf, DT32F *inp, DT32F *out)
Calculates the filter output but does not update the filter coefficients for the asptBfdaf32f filter. It also updates the internal buffers and power estimate.- Returns :
- Input Parameters :
- bfdaf : asptBfdaf32f filter to be processed
- inp : pointer to the new block of input samples
- Output Parameters :
- out : pointer to an array to store the filter output samples
- Error Conditions
- ASPT_NO_ERR : success
- ASPT_NULL_PTR_ERR : NULL pointer error
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bfdaf32fFree
void bfdaf32fFree(asptBfdaf32f *bfdaf)
Frees the allocated memory for this asptBfdaf32f filter. - Returns :
- Input Parameters :
- bfdaf : pointer to asptBfdaf32f filter
- Remarks :
-
Use this function only with filters created with bfdaf32fInit(). Do not use with asptBfdaf32f filters created using bfdaf32fInitStatic().
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bfdaf32fReset
DT32S bfdaf32fReset(asptBfdaf32f *bfdaf)
Resets all filter coefficients to zero.- Returns :
- Input Parameters :
- bfdaf : pointer to the asptbfdaf32f filter to be reset.
- Error Conditions
- ASPT_NO_ERR : success
- ASPT_NULL_PTR_ERR : NULL pointer error
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bfdaf32fResetDelayLine
DT32S bfdaf32fResetDelayLine(asptBfdaf32f *bfdaf)
Resets the internal delay line to zeros.- Returns :
- Input Parameters :
- bfdaf : pointer to the asptbfdaf32f filter to be reset.
- Error Conditions
- ASPT_NO_ERR : success
- ASPT_NULL_PTR_ERR : NULL pointer error
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bfdaf32fGetCoef
DT32S bfdaf32fGetCoef(asptBfdaf32f *bfdaf, DT32F *dstBuf, DT32S ind, DT32S N, DT32S flip)
Copies N internal filter coefficients starting from coef[ind] to dstBuf. - Returns :
-
On success returns the number of coefficients copied, otherwise the error code (negative int).
- Input Parameters :
- bfdaf : pointer to asptBfdaf32f filter.
- dstBuf : destination buffer.
- ind : index to the first coefficient to be copied.
- N : number of coefficients to be copied.
- flip : if not 0, will flip the coefficients order.
- Error Conditions
- ASPT_NULL_PTR_ERR : dstBuf/bfdaf->wFreq is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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bfdaf32fSetCoef
DT32S bfdaf32fSetCoef(asptBfdaf32f *bfdaf, DT32F *newCoef, DT32S ind, DT32S N, DT32S flip)
Initializes N internal (time domain) filter coefficients starting from coef[ind] to the contents of newCoef. - Returns :
-
On success returns the number of coefficients copied, otherwise the error code (negative int).
- Input Parameters :
- bfdaf : pointer to the asptBfdaf32f filter to be set.
- newCoef : new coefficients vector.
- ind : index to the first coefficient to be set.
- N : number of coefficients to be set.
- flip : if not 0, will copy the coefficients in reverse order.
- Error Conditions
- ASPT_NULL_PTR_ERR : newCoef/bfdaf->wFreq is a NULL pointer
- ASPT_RANGE_ERR : ind/N is not a valid input value
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bfdaf32fResize
DT32S bfdaf32fResize(asptBfdaf32f *bfdaf, DT32S newLen, DT32S newBlock)
Resizes an asptBfdaf32f filter keeping as much of the filter state as possible. - Returns :
- Input Parameters :
- bfdaf : pointer to the asptBfdaf32f filter to be resized.
- newLen : required new filter length
- newBlock : new block length
- Error Conditions
- ASPT_NO_ERR : Resizing is successful
- ASPT_NULL_PTR_ERR : NULL pointer error
- ASPT_RANGE_ERR : newLength/newBlock 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 asptBfdaf32f filters.