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Filter Analysis

Analyze filters and filter objects

Functions

Filter Design and Visualization Tools

`filterDesigner`	Open Filter Designer app
`fvtool`	Visualize frequency response of DSP filters

Filter Response Characteristics

`freqrespest`	Frequency response estimate via filtering
`freqrespopts`	Create an options object for frequency response estimate
`freqz`	Frequency response of discrete-time filter System object
`grpdelay`	Group delay response of discrete-time filter System object
`impz`	Impulse response of discrete-time filter System object
`impzlength`	Length of impulse response of discrete-time filter System object
`measure`	Measure frequency response characteristics of filter System object
`noisepsd`	Power spectral density of filter output due to roundoff noise
`noisepsdopts`	Create an options object for output noise PSD computation
`phasedelay`	Phase delay response of discrete-time filter System object
`phasez`	Phase response of discrete-time filter System object (unwrapped)
`stepz`	Step response of discrete-time filter System object
`zerophase`	Zero-phase response of discrete-time filter System object
`zplane`	Z-plane zero-pole plot for discrete-time filter System object

Filter Properties

`coeffs`	Returns the filter System object coefficients in a structure
`cost`	Estimate cost of implementing filter System object
`cumsec`	Cumulative second-order section of the biquadratic filter
`disp`	Display filter properties and values
`double`	Cast fixed-point filter to use double-precision arithmetic
`fftcoeffs`	Frequency-domain coefficients
`filtstates.cic`	Store CIC filter states
`info`	Information about filter System object
`norm`	P-norm of filter
`nstates`	Number of filter states
`order`	Order of discrete-time filter System object
`reset`	Reset internal states of System object
`ss`	Convert discrete-time filter System object to state-space representation
`tf`	Convert discrete-time filter System object to transfer function
`zpk`	Zero-pole-gain conversion of discrete-time filter System object

Check Filter Characteristics

`firtype`	Determine type (1-4) of linear phase FIR filter System object
`isallpass`	Verify that discrete-time filter System object is allpass
`isfir`	Verify if filter System object is FIR
`islinphase`	Verify that discrete-time filter System object is linear phase
`ismaxphase`	Verify that discrete-time filter System object is maximum phase
`isminphase`	Verify that discrete-time filter System object is minimum phase
`isreal`	Verify that discrete-time filter System object is real
`issos`	Verify if discrete-time System object filter is in second-order sections form
`isstable`	Verify that discrete-time filter System object is stable
`scalecheck`	Check scaling of biquadratic filter

Filter Realization

`block`	Generate block from a digital filter
`realizemdl`	Simulink subsystem block for filter

Transform Filter Coefficients

`allpass2wdf`	Allpass to Wave Digital Filter coefficient transformation
`normalizefreq`	Switch filter specification between normalized frequency and absolute frequency
`wdf2allpass`	Wave Digital Filter to allpass coefficient transformation

Topics

Analysis Methods for Filter System Objects

List of all the analysis methods for filter System objects.

DSP System Toolbox Documentation

Support

Efficient Multirate Signal Processing in MATLAB

Efficient Multirate Signal Processing in MATLAB