Digital Signal refers to an electronic signal transmitted as binary code that can be either the presence or absence of current, high and low voltages or short pulses at a particular frequency.
Analog signals are continuous electrical signals that vary in time. Telephone voice signal is analog. The intensity of the voice causes electric current variations.
Digital signals are non-continuous, they change in individual steps. They consist of pulses or digits with discrete levels or values. The value of each pulse is constant.
Analog vs. Digital TV Signal
Given identical broadcast conditions, a digital TV signal won't travel as far as an analog TV signal. Things that affect reception include roofs, walls, hills, trees, wind, etc.
A digital signal is so sensitive that a person walking in front of it can knock it offline. In comparison, an analog signal is like a tough wall. It'll take more than someone walking in front of the antenna to drop the signal.
Unlike analog television signals, when digital television signals become too weak, they don't develop snow and ghosts. Instead, the digital signal pixilated or cuts out entirely.
Viewers can use the following ways to increase their DTV signal strength:-
Choosing an Antenna: How close you are to the source of programming will affect the strength of the television signal. Also, the terrain and other buildings near you may block and reflect digital television signals
Connect the Cables: If you have a digital television, line the antenna directly into the coaxial input of the TV.
Tips and Tricks: Telescope the antenna out as far as it will go. Place the antenna as high up in the air as possible. Also, create a loop.