A discrete time signal is a type of signal that is defined only at specific points in time. It is represented by a sequence of numbers or values that are measured at equally spaced intervals.
A continuous time signal is defined at every point in time, while a discrete time signal is only defined at specific points. Additionally, a continuous time signal can take on any value, while a discrete time signal is restricted to a finite set of values.
Some common techniques for sketching discrete time signals include plotting the values on a graph, using a stem plot, or using a table to list the values at each time point.
The frequency of a discrete time signal can be determined by counting the number of cycles within a given time interval. The frequency is equal to the number of cycles divided by the time interval.
Sketching discrete time signals is commonly used in fields such as signal processing, digital communications, and control systems. For example, it can be used to analyze and design filters, detect patterns in data, and model and control dynamic systems.