DSP Blockset

Implementing Predesigned Filters

The DSP Blockset Filter Designs library provides several blocks that implement digital FIR and IIR filters in your models. Some of these blocks allow you to first design and analyze a filter, and then implement the filter, as described in Designing, Analyzing, and Implementing Filters. This section shows you how to use the blocks that let you skip the design and analysis step, and let you provide the filter coefficients directly.

The following are the primary blocks for implementing filters for which you already know the coefficients:

• The Digital Filter block supports many filter structures, and can filter multichannel signals. This block generates highly optimized Real-Time Workshop C code that is suitable for use in floating-point embedded systems.
• The Filter Realization Wizard supports many filter structures, and realizes filters using sum, gain, and delay blocks so you can easily visualize your filter's structure. Use this block to simulate the numerical behavior of fixed-point filters on DSPs, FPGAs, and ASICs. (This block allows you to either design your filter from scratch or directly provide your filter's coefficients.)

Note    The DSP Blockset also provides blocks for implementing frequency-domain filters, time-varying filters, multirate filters (such as filter banks and filters for decimation and interpolation), and adaptive filters. For more information, see Topics Covered.

Examples and Other Related Topics.   The following topics have information related to implementing standard digital filters using the DSP Blockset:

• Example: Using the Digital Filter Block to Implement a Predesigned Filter -- How to implement filters using the Digital Filter block.
• Online references of the Digital Filter block -- Detailed information about the filter implementation capabilities of the Digital Filter block.
• Designing, Analyzing, and Implementing Filters -- How to design and analyze filters using DSP Blockset and other MathWorks products
• Multirate Filters -- Blocks for implementing multirate filters such as filter banks and FIR filters for decimation and interpolation
• Adaptive Filters -- Blocks for implementing adaptive filters such as Kalman and LMS adaptive filters
• Analog IIR Filters -- Using the block for designing and implement analog filters in the DSP Blockset.

Filter Analysis and Design with Other MathWorks Products

Implementing Predesigned Filters with the Digital Filter Block