Fixed-Point Filters

Fixed-point filter design

Objects

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dsp.AllpoleFilterIIR Filter with no zeros
dsp.BiquadFilterIIR filter using biquadratic structures
dsp.DifferentiatorDirect form FIR fullband differentiator filter
dsp.FIRFilterStatic or time-varying FIR filter
dsp.HDLFIRFilterFinite impulse response filter—optimized for HDL code generation
dsp.HighpassFilterFIR or IIR highpass filter
dsp.IIRFilterInfinite impulse response (IIR) filter
dsp.LowpassFilterFIR or IIR lowpass filter
dsp.SOSFilterSecond-order section biquadratic IIR filter structures
dsp.CICCompensationDecimatorCompensate for CIC decimation filter using FIR decimator
dsp.CICCompensationInterpolatorCompensate for CIC interpolation filter using FIR interpolator
dsp.CICDecimatorDecimate signal using cascaded integrator-comb (CIC) filter
dsp.CICInterpolatorInterpolate signal using cascaded integrator-comb filter
dsp.DigitalDownConverterTranslate digital signal from intermediate frequency (IF) band to baseband and decimate it
dsp.DigitalUpConverterInterpolate digital signal and translate it from baseband to IF band
dsp.FarrowRateConverterPolynomial sample rate converter with arbitrary conversion factor
dsp.FIRDecimatorPolyphase FIR decimator
dsp.FIRHalfbandDecimatorHalfband decimator
dsp.FIRHalfbandInterpolatorHalfband interpolator
dsp.FIRInterpolatorPolyphase FIR interpolator
dsp.FIRRateConverterSample rate converter
dsp.HDLFIRRateConverterUpsample, filter, and downsample—optimized for HDL code generation
dsp.SubbandAnalysisFilterDecompose signal into high-frequency and low-frequency subbands
dsp.SubbandSynthesisFilterReconstruct signal from high-frequency and low-frequency subbands
dsp.LMSFilterCompute output, error, and weights of LMS adaptive filter

Functions

autoscaleAutomatic dynamic range scaling
denormalizeUndo filter coefficient and gain changes caused by normalize
freqrespestFrequency response estimate via filtering
freqrespoptsCreate an options object for frequency response estimate
freqzFrequency response of discrete-time filter System object
impzImpulse response of discrete-time filter System object
isstableVerify that discrete-time filter System object is stable
limitcycleResponse of single-rate, fixed-point IIR filter
noisepsdPower spectral density of filter output due to roundoff noise
noisepsdoptsCreate an options object for output noise PSD computation
normalizeNormalize filter numerator or feed-forward coefficients
reffilterReference filter for fixed-point or single-precision filter
reorderReorder second-order sections of biquadratic filter System object
scaleScale second-order sections
set2intConfigure filter for integer filtering
specifyallFully specify fixed-point filter System object settings
zplaneZ-plane zero-pole plot for discrete-time filter System object

Blocks

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Allpole FilterModel allpole filters
Biquad FilterModel biquadratic IIR (SOS) filters
Differentiator FilterDirect form FIR fullband differentiator filter
Discrete FilterModel Infinite Impulse Response (IIR) filters
Discrete FIR FilterModel FIR filters
Discrete FIR Filter HDL OptimizedFinite impulse response filter—optimized for HDL code generation
Highpass FilterDesign FIR or IIR highpass filter
Lowpass FilterDesign FIR or IIR lowpass filter
CIC Compensation DecimatorCompensate for CIC filter using FIR decimator
CIC Compensation InterpolatorCompensate for CIC filter using FIR interpolator
CIC DecimationDecimate signal using cascaded integrator-comb filter
CIC InterpolationInterpolate signal using cascaded integrator-comb filter
Digital Down-ConverterTranslate digital signal from Intermediate Frequency (IF) band to baseband and decimate it
Digital Up-ConverterInterpolate digital signal and translate it from baseband to Intermediate Frequency (IF) band
Farrow Rate ConverterPolynomial sample-rate converter with arbitrary conversion factor
FIR DecimationFilter and downsample input signals
FIR Halfband DecimatorDecimate signal using polyphase FIR halfband filter
FIR Halfband InterpolatorInterpolate signal using polyphase FIR half band filter
FIR InterpolationUpsample and filter input signals
FIR Rate ConversionUpsample, filter, and downsample input signals
FIR Rate Conversion HDL OptimizedUpsample, filter, and downsample input signal and generates optimized HDL code
Two-Channel Analysis Subband FilterDecompose signal into high-frequency and low-frequency subbands
Two-Channel Analysis Subband FilterDecompose signal into high-frequency and low-frequency subbands
LMS FilterCompute output, error, and weights using LMS adaptive algorithm
Filter Realization WizardConstruct filter realizations using digital filter blocks or Sum, Gain, and Delay blocks

Topics

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.

Featured Examples

Sigma-Delta A/D Conversion

Sigma-Delta A/D Conversion

Model analog-to-digital conversion using a sigma-delta algorithm implementation.

Open Model
Cochlear Implant Speech Processor

Cochlear Implant Speech Processor

Simulate the design of a cochlear implant that can be placed in the inner ear of a profoundly deaf person to restore partial hearing. Signal processing is used in cochlear implant development to convert sound to electrical pulses. The pulses can bypass the damaged parts of a deaf person's ear and be transmitted to the brain to provide partial hearing.

Open Model
Design and Analysis of a Digital Down Converter

Design and Analysis of a Digital Down Converter

Use the digital down converter (DDC) System object to emulate the TI Graychip 4016 digital down converter in a simple manner. We base the example on a comparison with the GSM Digital Down Converter in MATLAB example. We show how the DDC System object can be used to design and analyze the decimation filters and to quickly explore different design options that meet various passband and stopband frequency and attenuation specifications. This example requires a Fixed-Point Designer™ license.

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