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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`	Options for filter frequency response analysis
`freqz`	Frequency response of filter
`grpdelay`	Group delay response of discrete-time filter System object
`impz`	Impulse response of discrete-time filter System object
`impzlength`	Impulse response length
`measure`	Measure frequency response characteristics of filter System object
`noisepsd`	Power spectral density of filter output due to roundoff noise
`noisepsdopts`	Options for running filter output noise PSD
`phasedelay`	Phase delay response of discrete-time filter System object
`phasez`	Unwrapped phase response for filter
`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`	Filter coefficients
`cost`	Estimate cost of implementing filter System objects
`cumsec`	Cumulative second-order section of the biquadratic filter
`disp`	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 the internal states of a 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`	Type of linear phase FIR filter
`isallpass`	Determine whether filter is allpass
`isfir`	Determine whether filter System object is FIR
`islinphase`	Determine whether filter has linear phase
`ismaxphase`	Determine whether filter is maximum phase
`isminphase`	Determine whether filter is minimum phase
`isreal`	Determine whether filter uses real coefficients
`issos`	Determine whether filter is SOS form
`isstable`	Determine whether filter 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