Transient Variable Area Downhole Inverse Models - Measurement While Drilling Signal Analysis, Optimization and Design - page 152

Figure 5.2d . Short rectangular pulse with rounded edges.
This concludes our discussion on surface and downhole reflection processing.
Reflections are not “forgiving” in one-dimensional MWD waveguides which,
unlike those in three dimensions, “have no where to go.” Additional filters are
needed for signal processor development and are briefly described in Chapter 6.
5.3 References
Oppenheim, A.V. and Schafer, R.W., Digital Signal Processing , Prentice-Hall,
New Jersey, 1975.
Oppenheim, A.V. and Schafer, R.W., Discrete-Time Signal Processing ,
Prentice-Hall, New Jersey, 1989.