Filter

Classes
class	sp::FIR_filt< T1, T2, T3 >
class	sp::IIR_filt< T1, T2, T3 >

Functions
arma_inline arma::vec	sp::fir1 (const arma::uword M, const double f0)
arma_inline arma::vec	sp::fir1_hp (const arma::uword M, const double f0)
arma_inline arma::vec	sp::fir1_bp (const arma::uword M, const double f0, const double f1)
arma_inline arma::vec	sp::fir1_bs (const arma::uword M, const double f0, const double f1)
arma_inline arma::vec	sp::fd_filter (const arma::uword M, double fd)
arma_inline arma::cx_vec	sp::freq (const arma::vec b, const arma::vec a, const arma::uword K=512)
arma_inline arma::vec	sp::freqz (const arma::vec b, const arma::vec a, const arma::uword K=512)
arma_inline arma::vec	sp::phasez (const arma::vec b, const arma::vec a, const arma::uword K=512)

Detailed Description

Function Documentation

fd_filter()

arma_inline arma::vec sp::fd_filter	(	const arma::uword	M,
		double	fd
	)

Fractional delay function. Fractional delay filter design using windowed sinc method. Actual delay is M/2+fd samples for even nr of taps and (M-1)/2+fd for odd nr of taps Best performance if -1 < fd < 1.

Parameters

M	Filter length
fd	Fractional delay

Definition at line 716 of file filter.h.

References sp::blackmanharris(), sp::FIR_filt< T1, T2, T3 >::M, and sp::sinc().

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fir1()

arma_inline arma::vec sp::fir1	(	const arma::uword	M,
		const double	f0
	)

FIR lowpass design function. FIR lowpassdesign using windows method (hamming window). NB! Returns size M+1.

Filter design functions

Returns

b Filter coefficients \( [b_0 ..b_N] \)

Parameters

M	Filter order
f0	Filter cutoff frequency in interval [0..1]

Examples:

filter_plot.cpp, and fir_iir.cpp.

Definition at line 607 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::b, sp::hamming(), and sp::sinc().

Referenced by main(), and sp::resampling< T1 >::resampling().

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fir1_bp()

arma_inline arma::vec sp::fir1_bp	(	const arma::uword	M,
		const double	f0,
		const double	f1
	)

FIR bandpass design function. FIR design using windows method (hamming window). NB! Returns size M+1.

Returns

b Filter coefficients \( [b_0 ..b_N] \)

Parameters

M	Filter order
f0	Filter low cutoff frequency in interval [0..1]
f1	Filter high cutoff frequency in interval [0..1]

Definition at line 655 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::b, err_handler, sp::hamming(), sp::PI, and sp::sinc().

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fir1_bs()

arma_inline arma::vec sp::fir1_bs	(	const arma::uword	M,
		const double	f0,
		const double	f1
	)

FIR bandstop design function. FIR design using windows method (hamming window). NB! Returns size M+1.

Returns

b Filter coefficients \( [b_0 ..b_N] \)

Parameters

M	Filter order (must be even)
f0	Filter low cutoff frequency in interval [0..1]
f1	Filter high cutoff frequency in interval [0..1]

Definition at line 688 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::b, err_handler, sp::hamming(), and sp::sinc().

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fir1_hp()

arma_inline arma::vec sp::fir1_hp	(	const arma::uword	M,
		const double	f0
	)

FIR highpass design function. FIR design using windows method (hamming window). NB! Returns size M+1.

Returns

b Filter coefficients \( [b_0 ..b_N] \)

Parameters

M	Filter order (must be even)
f0	Filter cutoff frequency in interval [0..1]

Definition at line 626 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::b, err_handler, sp::hamming(), sp::PI, and sp::sinc().

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freq()

arma_inline arma::cx_vec sp::freq	(	const arma::vec	b,
		const arma::vec	a,
		const arma::uword	K = 512
	)

Frequency response function. Calculates the frequency response.

Parameters

b	FIR/MA filter coefficients
a	IIR/AR filter coefficients
K	Number of evaluation points, Default 512

Definition at line 738 of file filter.h.

References sp::FIR_filt< T1, T2, T3 >::b, sp::FIR_filt< T1, T2, T3 >::K, sp::FIR_filt< T1, T2, T3 >::M, and sp::PI.

Referenced by sp::freqz(), and sp::phasez().

freqz()

arma_inline arma::vec sp::freqz	(	const arma::vec	b,
		const arma::vec	a,
		const arma::uword	K = 512
	)

Frequency magnitude response function. Calculates the frequency magnitude response.

Parameters

b	FIR/MA filter coefficients
a	IIR/AR filter coefficients
K	Number of evaluation points, Default 512

Examples:

filter_plot.cpp.

Definition at line 765 of file filter.h.

References sp::freq(), and sp::FIR_filt< T1, T2, T3 >::K.

Referenced by main().

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phasez()

arma_inline arma::vec sp::phasez	(	const arma::vec	b,
		const arma::vec	a,
		const arma::uword	K = 512
	)

Frequency phase response function. Calculates the frequency phase response.

Parameters

b	FIR/MA filter coefficients
a	IIR/AR filter coefficients
K	Number of evaluation points, Default 512

Examples:

filter_plot.cpp.

Definition at line 779 of file filter.h.

References sp::angle(), sp::freq(), and sp::FIR_filt< T1, T2, T3 >::K.

Referenced by main().

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