Analysis Methods for Filter System Objects

Method	Description
Single-rate and Multirate Analysis
`fvtool`	Filter visualization tool
`info`	Filter information
`freqz`	Frequency response of a discrete-time filter
`phasez`	Phase response of a discrete-time filter
`zerophase`	Zero-phase response of a discrete-time filter
`grpdelay`	Group delay of a discrete-time filter
`phasedelay`	Phase delay of a discrete-time filter
`impz`	Impulse response of a discrete-time filter
`impzlength`	Impulse response length
`stepz`	Step response of a discrete-time filter
`zplane`	Pole/Zero plot
`cost`	Cost estimate
`measure`	Measure filter response
`order`	Filter order
`firtype`	Determine the type (1–4) of a linear phase FIR filter
`coeffs`	Return filter coefficients
Multirate Analysis
`polyphase`	Polyphase decomposition of multirate filters
`gain`	Gain of a Cascaded Integrator-Comb (CIC) filter
Second-order Sections
`scale`	Scale second-order sections
`scalecheck`	Check scale of second-order sections
`scaleopts`	Create options object for sos scaling
`cumsec`	Vector of cumulative second-order section filters
`reorder`	Reorder second-order sections
`sos`	Convert IIR filter to Biquad filter
Code Generation
`realizemdl`	Filter realization diagram
Fixed-point (supported by FIRFilter, IIRFilter, AllpoleFilter, and BiquadFilter only)
`noisepsd`	Power spectral density of filter output due to roundoff noise
`noisepsdopts`	Create options object for noisepsd computation
`freqrespest`	Frequency response estimate via filtering
`freqrespopts`	Create options object for frequency response estimate
Other
`isallpass`	True for allpass discrete-time filter
`islinphase`	True for linear discrete-time filter
`ismaxphase`	True if maximum phase
`isminphase`	True if minimum phase
`isreal`	True for discrete-time filter with real coefficients
`isstable`	True if the filter is stable
`isfir`	True if the filter is FIR
`issos`	True if filter is in second order sections form
`specifyall`	Specify all fixed-point properties

DSP System Toolbox Documentation

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