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

Besides discussing an implementation issue relating to filters' group delays and some background information about the role of raised cosine filters in communications, this section describes the toolbox functions that accomplish filtering tasks: hilbiir, rcosflt, rcosine, and the lower-level functions rcosfir and rcosiir.

For more 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, type playshow rcosdemo.

Selected Bibliography for Modulation

Noncausality and the Group Delay Parameter