Communications Toolbox

Special Filters

The Communications Toolbox includes several functions that can help you design and use filters. Other filtering capabilities are in the Signal Processing Toolbox.

Special Filter Features of the Toolbox

Filtering tasks supported in the Communications Toolbox include:

• Designing a Hilbert transform filter
• Filtering data using a raised cosine filter
• Designing a raised cosine filter

After discussing an implementation issue relating to filters' group delays, this section describes the toolbox functions that accomplish these tasks: hilbiir, rcosflt, rcosine, and the lower-level functions rcosfir and rcosiir.

For background information about Hilbert filters and raised cosine filters, see the works listed in Selected Bibliography for Special Filters. For a demonstration involving raised cosine filters, see rcosdemo.

Selected Bibliography for Modulation

Noncausality and the Group Delay Parameter