DSP Blockset Release Notes

Upgrading from an Earlier Release

The following topics describe the upgrade issues involved in moving from the DSP Blockset 4.1 to Version 5.0:

• New Default Setting Enables Boolean Data Type Support
• Replaced Filtering Blocks
• Contiguous Copy Block Obsolete
• Audio Blocks Relocated

If you are upgrading from a version earlier than 4.0, then you should see Upgrading from an Earlier Release of the DSP Blockset 4.0 Release Notes.

New Default Setting Enables Boolean Data Type Support

The Simulink default settings now enable Boolean data type support. This allows you to take advantage of the full Boolean data type support in DSP Blockset 5.0.

In some cases, you may want to override the Simulink default and disable Boolean support. For instance, for each of the following blocks, the default data type of at least one output has now changed from double-precision to Boolean:

Counter Edge Detector Event-Count Comparator

N-Sample Enable Queue Stack

If you have a model that uses previous versions of the above blocks, their new default Boolean data type can potentially break your model. If the change in data type does break your model, you can fix this by disabling Boolean support; then the output data type of the blocks will remain double-precision, and your model will behave just as it did before.

For more information about disabling Boolean support, see the following topics:

• DSP Blockset documentation about steps to disabling Boolean support
• DSP Blockset documentation about the effects of enabling and disabling Boolean support.

For more information about the new Boolean data type support in DSP Blockset 5.0, see the following topics:

• Full Boolean Data Type Support -- Description of the new full support of the Boolean data type in DSP Blockset 5.0.
• A list of all DSP Blockset blocks that support Boolean data types in the DSP Blockset documentation.

Replaced Filtering Blocks

The new Digital Filter block in the Filter Designs library replaces the following blocks from DSP Blockset 4.1:

• Biquadratic Filter
• Time-Varying Lattice Filter
• Time-Varying Direct-Form II Transpose Filter

Your models that contain these replaced blocks will still work, and you can still access these blocks by typing dsparch3 at the MATLAB command line.

However, when creating new models, use the new Digital Filter block, which can implement various filters including those that the above three blocks implement: biquadratic direct from II transposed filters, time-varying lattice filters, and time-varying direct form II transposed filters.

See Digital Filter for more information about the new Digital Filter block.

Contiguous Copy Block Obsolete

The Contiguous Copy Block, formerly in the Signal Attributes library, is now obsolete. Your models that currently use the block will still work, but you can no longer access the block in the DSP Blockset 5.0 libraries.

Audio Blocks Relocated

The following blocks, formerly in the DSP Sources and DSP Sinks libraries, are now in the new Windows (WIN32) library:

• From Wave Device
• From Wave File
• To Wave Device
• To Wave File

For more information, see Audio Blocks Relocated to New Block Library.

New Options for Event Detection

Platform Limitations for HP and IBM