Maintaining the approach to digital system analysis of the first edition, this volume begins by relating continuous and digital signals to the process of sampling and then examines the techniques of digital signal analysis and processing. The text includes an expanded library of portable modules in FORTRAN-77. These modules cover applications and are designed to be used to perform useful operations in practice as well as to demonstrate the signal processing operations described in the text. There are revised chapters on discrete transforms, FIR and IIR filtering and spectral estimation as well as new chapters on the z-transform and least-squares system design. Included are also discussions of lattice structures and parametric spectral estimation and two appendices on Laplace and z-transforms and computing algorithms in FORTRAN-77.