CTAN has a new package: pst-sigsys

[CTAN Announcements]

This package has been put up at tug.ctan.org and in the next day should make
its way through the mirroring system.

Thanks again,
Jim Hefferon
Saint Michael's College

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The following information was provided by our fellow contributor:

Name of contribution: pst-sigsys
Author's name: Farshid Delgosha
Location on CTAN: /graphics/pstricks/contrib/pst-sigsys
Summary description: The pst-sigsys is a collection of useful macros for  
  disciplines related to signal processing.
License type: lppl

Announcement text: 
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The pst-sigsys is a collection of useful macros for
disciplines related to signal processing. It defines macros
for plotting a sequence of numbers, drawing the pole-zero
diagram of a system, shading the region of convergence,
creating an adder or a multiplier node, placing a framed
node at a given coordinate, creating an up-sampler or a
down-sampler node, and connecting a list of nodes using any
node-connecting macro.
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This package is located at 
   http://tug.ctan.org/tex-archive/graphics/pstricks/contrib/pst-sigsys
.  More information is at
   http://tug.ctan.org/pkg/pst-sigsys
(if the package is new it may take a day for that information to 
appear).  We are supported by the TeX Users Group http://www.tug.org .  
Please join a users group; see http://www.tug.org/usergroups.html .