com.hissain.jscipy.signal.filter

Class FIR

java.lang.Object

com.hissain.jscipy.signal.filter.FIR

public class FIR
extends java.lang.Object

Finite Impulse Response (FIR) filter design methods. Matches scipy.signal.firwin

Constructor Summary

Constructors

Constructor and Description
FIR()

Method Summary

Modifier and Type	Method and Description
static double[]	firwin_bandpass(int numtaps, double low, double high, double fs) Design a Bandpass FIR filter.
static double[]	firwin_bandstop(int numtaps, double low, double high, double fs) Design a Bandstop FIR filter.
static double[]	firwin_highpass(int numtaps, double cutoff, double fs) Design a Highpass FIR filter.
static double[]	firwin_lowpass(int numtaps, double cutoff, double fs) Design a Lowpass FIR filter.
static double[]	firwin(int numtaps, double[] cutoff, double fs, boolean pass_zero) Design an FIR filter using the window method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

FIR

public FIR()

Method Detail

firwin

public static double[] firwin(int numtaps,
                              double[] cutoff,
                              double fs,
                              boolean pass_zero)

Design an FIR filter using the window method. Default window is "hamming".

Parameters:

numtaps - The number of taps.

cutoff - Cutoff frequency (Hz). Scalar or array.

fs - Sampling frequency (Hz).

pass_zero - If true, the zero frequency is passed (Lowpass, Bandstop). If false, the zero frequency is stopped (Highpass, Bandpass).

Returns:

Filter coefficients.

firwin_lowpass

public static double[] firwin_lowpass(int numtaps,
                                      double cutoff,
                                      double fs)

Design a Lowpass FIR filter.

Parameters:

numtaps - The number of taps.

cutoff - Cutoff frequency (Hz).

fs - Sampling frequency (Hz).

Returns:

Filter coefficients.

firwin_highpass

public static double[] firwin_highpass(int numtaps,
                                       double cutoff,
                                       double fs)

Design a Highpass FIR filter. (Requires odd number of taps for strict highpass usually, but window method handles evens with bad response at Pi).

Parameters:

numtaps - The number of taps.

cutoff - Cutoff frequency (Hz).

fs - Sampling frequency (Hz).

Returns:

Filter coefficients.

firwin_bandpass

public static double[] firwin_bandpass(int numtaps,
                                       double low,
                                       double high,
                                       double fs)

Design a Bandpass FIR filter.

Parameters:

numtaps - The number of taps.

low - Lower cutoff frequency (Hz).

high - Upper cutoff frequency (Hz).

fs - Sampling frequency (Hz).

Returns:

Filter coefficients.

firwin_bandstop

public static double[] firwin_bandstop(int numtaps,
                                       double low,
                                       double high,
                                       double fs)

Design a Bandstop FIR filter.

Parameters:

numtaps - The number of taps.

low - Lower cutoff frequency (Hz).

high - Upper cutoff frequency (Hz).

fs - Sampling frequency (Hz).

Returns:

Filter coefficients.