Basic Operations of Signals

Signal Operations are to modify time variable in to a new form of signal. (This is the simplest form of system.).This just like mathematical graphical transformations from 21A.

Signal operations makes it easy to express a large domain of signals based on the fundamental signals by operation upon the basic signals.

The three kinds of Signal Operations are  Time Shifting ,  Time Scaling  &  Time Inversion (or  Time Reversal )

Time Shifting
Time signal is basically shift time along with time and when we add constant to it the signal will either increase or decrease. ( Adding or subtracting)

Time Scaling
Time scaling is either expanding or narrow the signal. ( Multiplying or dividing

Time Inversion
Time Inversion is simply flipping the signal about the y-axis.Just use it like a mirror.

Examples and Practice Problems


Practice problems 

Solutions

Extra Resources
Youtube videos = Scaling and Addition =

= Time Shifting =

Reference

Signal and operations

Practice problems