Discrete Frequency Equation and Relation

1. What is a discrete frequency?
2. What is the relationship between continuous-time signals and discrete-time signals?
3. What is discrete frequency domain?

What is a discrete frequency?

A discrete frequency distribution is a table that shows each number and the number of times it appears in a list (frequency). The numbers are usually integers, but other step sizes (such as tenths) are acceptable as long as each number is an integral multiple of the step size.

What is the relationship between continuous-time signals and discrete-time signals?

A continuous-time signal has values for all points in time in some (possibly infinite) interval. A discrete time signal has values for only discrete points in time. Signals can also be a function of space (images) or of space and time (video), and may be continuous or discrete in each dimension.

What is discrete frequency domain?

A discrete frequency domain is a frequency domain that is discrete rather than continuous. For example, the discrete Fourier transform maps a function having a discrete time domain into one having a discrete frequency domain.