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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
`filtstates.cic`	Store CIC filter states
`info`	Information about filter System object
`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

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

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