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Fixed-Point Filters

Fixed-point filter design.

System Objects

dsp.AllpoleFilter IIR Filter with no zeros
dsp.BiquadFilter IIR filter using biquadratic structures
dsp.Differentiator Direct form FIR fullband differentiator filter
dsp.FIRFilter Static or time-varying FIR filter
dsp.HighpassFilter FIR or IIR highpass filter
dsp.IIRFilter Infinite Impulse Response (IIR) filter
dsp.LowpassFilter FIR or IIR lowpass filter
dsp.CICCompensationDecimator Compensate for CIC decimation filter using FIR decimator
dsp.CICCompensationInterpolator Compensate for CIC interpolation filter using FIR interpolator
dsp.CICDecimator Decimate input using Cascaded Integrator-Comb filter
dsp.CICInterpolator Interpolate signal using Cascaded Integrator-Comb filter
dsp.DigitalDownConverter Translate digital signal from Intermediate Frequency (IF) band to baseband and decimate it
dsp.DigitalUpConverter Interpolate digital signal and translate it from baseband to Intermediate Frequency (IF) band
dsp.FarrowRateConverter Polynomial sample rate converter with arbitrary conversion factor
dsp.FIRDecimator Polyphase FIR decimator
dsp.FIRHalfbandDecimator Halfband decimator
dsp.FIRHalfbandInterpolator Halfband interpolator
dsp.FIRInterpolator Polyphase FIR interpolator
dsp.FIRRateConverter Sample rate converter
dsp.HDLFIRRateConverter Upsample, filter, and downsample—optimized for HDL code generation
dsp.SubbandAnalysisFilter Decompose signal into high-frequency and low-frequency subbands
dsp.SubbandSynthesisFilter Reconstruct signal from high-frequency and low-frequency subbands
dsp.LMSFilter LMS adaptive filter

Functions

autoscale Automatic dynamic range scaling
denormalize Undo filter coefficient and gain changes caused by normalize
freqrespest Frequency response estimate via filtering
freqrespopts Options for filter frequency response analysis
freqz Frequency response of filter
impz Filter impulse response
isstable Determine whether filter is stable
limitcycle Response of single-rate, fixed-point IIR filter
noisepsd Power spectral density of filter output due to roundoff noise
noisepsdopts Options for running filter output noise PSD
normalize Normalize filter numerator or feed-forward coefficients
qreport Most recent fixed-point filtering operation report
reffilter Reference filter for fixed-point or single-precision filter
reorder Rearrange sections in SOS filter
scale Scale sections of SOS filter
set2int Configure filter for integer filtering
specifyall Fixed-point scaling modes in direct-form FIR filter
zplane Zero-poles plots for filters

Blocks

Allpole Filter Model allpole filters
Biquad Filter Model biquadratic IIR (SOS) filters
Differentiator Filter Direct form FIR fullband differentiator filter
Discrete Filter Model Infinite Impulse Response (IIR) filters
Discrete FIR Filter Model FIR filters
Highpass Filter Design FIR or IIR highpass filter
Lowpass Filter Design FIR or IIR lowpass filter
CIC Compensation Decimator Compensate for CIC filter using FIR decimator
CIC Compensation Interpolator Compensate for CIC filter using FIR interpolator
CIC Decimation Decimate signal using Cascaded Integrator-Comb filter
CIC Interpolation Interpolate signal using Cascaded Integrator-Comb filter
Digital Down-Converter Translate digital signal from Intermediate Frequency (IF) band to baseband and decimate it
Digital Up-Converter Interpolate digital signal and translate it from baseband to Intermediate Frequency (IF) band
Farrow Rate Converter Polynomial sample-rate converter with arbitrary conversion factor
FIR Decimation Filter and downsample input signals
FIR Halfband Decimator Decimate signal using polyphase FIR halfband filter
FIR Halfband Interpolator Interpolate signal using polyphase FIR half band filter
FIR Interpolation Upsample and filter input signals
FIR Rate Conversion Upsample, filter, and downsample input signals
FIR Rate Conversion HDL Optimized Upsample, filter, and downsample input signals—optimized for HDL code generation
Two-Channel Analysis Subband Filter Decompose signal into high-frequency and low-frequency subbands
Two-Channel Analysis Subband Filter Decompose signal into high-frequency and low-frequency subbands
LMS Filter Compute output, error, and weights using LMS adaptive algorithm
Filter Realization Wizard Construct filter realizations using digital filter blocks or Sum, Gain, and Delay blocks

Topics

Fixed-Point Concepts and Terminology

Defines fixed-point concepts and terminology that are helpful to know as you use DSP System Toolbox™ software

Fixed-Point Precision Rules for Avoiding Overflow in FIR Filters

Precision Rules for Avoiding Overflow in FIR Filters

Create an FIR Filter Using Integer Coefficients

Learn how to create an FIR filter using integer coefficients.

Use Filter Designer with DSP System Toolbox Software

Presents a detailed reference covering the fixed-point, multirate, and scaling pages of the Filter Designer App

References — Fixed-Point Filters

Suggested reading and sources for information about fixed-point filters and SOS scaling

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