kopia lustrzana https://github.com/Dsplib/libdspl-2.0
Merge branch 'master' of https://github.com/Dsplib/libdspl-2.0
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This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019/W32TeX) (preloaded format=latex 2019.12.29) 9 JAN 2020 22:59
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entering extended mode
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restricted \write18 enabled.
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**_formulas.tex
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LaTeX2e <2019-10-01> patch level 3
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Document Class: article 2019/10/25 v1.4k Standard LaTeX document class
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File: size10.clo 2019/10/25 v1.4k Standard LaTeX file (size option)
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[1
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] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]
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[14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28]
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(./_formulas.aux) )
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Output written on _formulas.dvi (126 pages, 17432 bytes).
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@ -87,9 +87,78 @@ int DSPL_API bilinear(double* bs, double* as, int ord, double* bz, double* az)
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/******************************************************************************
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Digital IIR filter coefficients calculation
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*******************************************************************************/
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/*! ****************************************************************************
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\ingroup IIR_FILTER_DESIGN_GROUP
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\fn int iir(double rp, double rs, int ord, double w0, double w1, int type, double* b, double* a)
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\brief IIR digital filter transfer function \f$H(z)\f$
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coefficients calculation which can be used in \ref filter_iir
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\param[in] rp Filter passband ripple level (dB). \n \n
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\param[in] rs Filter stopband supression level (dB).\n \n
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\param[in] ord Filter order. \n
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Number of \f$H(z)\f$ coefficients is `ord+1`. \n
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This parameter must be evan for bandpass
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and bandstop filter type.\n \n
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\param[in] w0 Normlized cutoff frequency for LPF and HPF. \n
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Left cutoff frequency for bandpass and bandstop filter. \n
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Valid value from 0 to 1. \n
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Here 0 corresponds to 0 Hz frequency, 1 corresponds to
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Fs/2 Hz frequency. \n \n
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\param[in] w1 Right cutoff frequency for bandpass and bandstop filter.\n
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Valid value from 0 to 1. \n
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Here 0 corresponds to 0 Hz frequency, 1 corresponds to
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Fs/2 Hz frequency. \n
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This parameter is ignored for LPF and HPF. \n \n
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\param[in] type Filter type. \n
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This paramenter is combination of filter type flags:\n
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\verbatim
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DSPL_FILTER_LPF - lowpass filter;
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DSPL_FILTER_HPF - highpass filter;
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DSPL_FILTER_BPASS - bandpass filter;
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DSPL_FILTER_BSTOP - bandstop filter,
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\endverbatim
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and filter approximation flags:
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\verbatim
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DSPL_FILTER_BUTTER - Buttetworth filter;
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DSPL_FILTER_CHEBY1 - Chebyshev type 1 filter;
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DSPL_FILTER_CHEBY2 - Chebyshev type 2 filter;
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DSPL_FILTER_ELLIP - elliptic filter.
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\endverbatim
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\n \n
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\param[out] b Pointer to the vector of \f$H(z)\f$ numerator. \n
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Vector size is `[ord+1 x 1]`.\n
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Memory must be allocated. \n \n
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\param[out] a Pointer to the vector of \f$H(z)\f$ denominator. \n
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Vector size is `[ord+1 x 1]`.\n
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Memory must be allocated. \n \n
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\return
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`RES_OK` if filter is calculated successfully. \n \n
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Else \ref ERROR_CODE_GROUP "code error". \n
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Example:
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\include iir_test.c
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Program calculates filter coefficients for different
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`type` parameter combination. Also program calculates filters magnitude and
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draws plot:
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\image html iir_test.png
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\author Sergey Bakhurin www.dsplib.org
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***************************************************************************** */
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int DSPL_API iir(double rp, double rs, int ord, double w0, double w1,
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int type, double* b, double* a)
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{
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@ -167,7 +236,6 @@ int DSPL_API iir(double rp, double rs, int ord, double w0, double w1,
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err = bilinear(bt, at, ord, b, a);
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error_proc:
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if(bs)
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