Approved for public release; distribution is unlimited / The Electrical and Computer Engineering Department at the Naval Postgraduate School has a need for additional software to be used in instructing students studying digital signal processing. This software will be used in a PC lab or at home. This thesis provides a set of disks written in APL (A Programming Language) which allows the user to input arbitrary signals from a disk, to perform various signal processing operations, to plot the results, and to save them without the need for complicated programming. The software is in the form of a digital signal processing toolkit. The user can select functions which can operate on the signals and interactively apply them in any order. The user can also easily develop new functions and include them in the toolkit. The thesis includes brief discussions about the library workspaces, a user manual, function listings with examples of their use, and an application paper. The software is modular and can be expanded by adding additional sets of functions. / http://archive.org/details/pcsoftwarefortea00katz / Major, Israeli Air Force