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Digital Filter Design Concepts



Digital Filter Design Basics

Digital Filter Design Process Overview
Filter Attributes
FIR and IIR Filters
Normalized Sampling Frequency
Filter Specifications
Design Methods
Group Delay and Phase Delay
Poles, Zeroes, and Pole-Zero Plots
Digital Filter Applications

Designing Floating-Point Filters

Floating-Point Filter Design Process
Entering Floating-Point Filter Specifications
Analyzing Floating-Point Filters
Using Floating-Point Filters

Designing Fixed-Point Filters

Fixed-Point Filter Design Process
Selecting a Filter Structure

FIR Filter Structures
IIR Cascaded Second-Order Sections Form Structures
IIR Direct Form Structures
Lattice Allpass Structures
Lattice AR Structures
Lattice ARMA Structures
Lattice MA Structures
Understanding Filter Structure Graphs

Scaling the Filter Coefficients
Quantizing Floating-Point Filters

Filter Structures and Filter Coefficients
Filter Coefficients and Quantizers
Specifying the Quantizer Source
Specifying the Word Length and Integer Word Length
Handling Overflow and Underflow
Setting the Rounding Mode

Analyzing Fixed-Point Filters
Creating Fixed-Point Filter Models
Simulating Fixed-Point Filters
Generating Code from Fixed-Point Filters

Exporting Fixed-Point Integer Coefficients
Generating Fixed-Point C Code
Generating Integer LabVIEW Code
Generating LabVIEW FPGA Code
Postprocessing Filtered Signals

Designing Special Filters

Linear Phase Filters
Hilbert Transformers
Differentiators
Notch and Peak Filters
Comb Filters
Arbitrary Shape Filters
Group Delay Compensator
Narrowband FIR Filters

Designing Multirate Filters

Multirate Filter Basics

Rational Resampling
Decimation
Interpolation
Zero-Phase Filtering

Designing Floating-Point Multirate Filters
Designing Fixed-Point Multirate Filters
Designing Special Multirate Filters

Cascaded Integrator Comb (CIC) Filters
Nyquist, Raised Cosine, and Halfband Filters
Multistage Multirate Filters

Advanced Techniques for Designing Filters

Remez Design Method

Minimum and Maximum Phase FIR Design
Single-Point Band Design
Exact Gain Control Design
Ripple Constraint Design

Least Pth Norm Design Method

Least Pth Norm Linear Phase FIR Design
Approximated Linear Phase IIR Design
Minimum and Maximum Phase IIR Design