We will use an FIR Equiripple filter with these specifications:ġ. We will design a low pass filter that passes all frequencies less than or equal to 20% of the Nyquist frequency (half the sampling frequency) and attenuates frequencies greater than or equal to 50% of the Nyquist frequency. You can right-click or click the What's This? button to get information on the different parts of the tool. The tool includes Context-sensitive help. Other panels can be displayed in the lower half by using the sidebar buttons. It controls what is displayed in the other two upper regions. The Design Panel, in the lower half is where you define your filter specifications. The lower half of the GUI is the interactive portion of Filter Designer. The Filter Display region, in the upper right, displays various filter responses, such as, magnitude response, group delay and filter coefficients. It also provides access to the Filter manager for working with multiple filters. The Current Filter Information region, in the upper left, displays filter properties, namely the filter structure, order, number of sections used and whether the filter is stable or not. See qfilt in the Filter Design Toolbox for more information.The upper half of the GUI displays information on filter specifications and responses for the current filter. See Lattice Structure for more information.įor Quantized filter, specify the filter as a Qfilt object. For Lattice ARMA, the Lattice coeff field specifies the lattice (reflection) coefficients, k(1) to k(N), and the Ladder coeff field specifies the ladder coefficients, v(1) to v(N+1), were N is the filter order.įilters in lattice form can be produced by tf2latc.For Lattice MA (minimum or maximum phase), the Lattice coeff field specifies the lattice (reflection) coefficients, k(1) to k(N), were N is the filter order.
For Lattice allpass, the Lattice coeff field specifies the lattice (reflection) coefficients, k(1) to k(N), were N is the filter order.See State-Space for more information.įor Lattice allpass, Lattice MA, and Lattice ARMA filters, specify the filter by its lattice representation: The A, B, C, and D fields each specify a variable name or a value for the matrices in this system.įilters in state-space form can be produced by functions such as tf2ss and zp2ss. See Second-Order Sections (SOS) for more information.įor State-Space, specify the filter by its state-space representation: Whose rows contain the numerator and denominator coefficients b ik and a ik of the second-order sections of H( z).įilters in second-order section form can be produced by functions such as tf2sos, zp2sos, ss2sos, and sosfilt. The Gain field specifies a variable name or a value for the gain g, and the SOS Matrix field specifies a variable name or a value for the L-by-6 SOS matrix See Transfer Function for more information.įor Direct form II (Second-order sections), specify the filter by its second-order section representation: For FIR filters, the Denominator is 1.įilters in transfer function form can be produced by all of the Signal Processing Toolbox filter design functions (e.g., fir1, fir2, remez, butter, yulewalk). The Denominator field specifies a variable name or value for the denominator coefficient vector a, which contains n+1 coefficients in descending powers of z.The Numerator field specifies a variable name or value for the numerator coefficient vector b, which contains m+1 coefficients in descending powers of z.The structure that you choose determines the type of coefficients that you need to specify in the text fields to the right:įor Direct Form I, Direct Form II, Direct Form I transposed, and Direct Form II transposed, specify the filter by its transfer function representation:
Filter Design and Analysis Tool (Signal Processing Toolbox) Signal Processing Toolbox
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