Why we only can transmit a real signal? [duplicate]

1. Why do we need to digitalize real world signal?
2. Which way to transmit signals is more reliable?
3. What are the two main transmission methods of digital signals?
4. What is a disadvantage to analog information transfer?

Why do we need to digitalize real world signal?

Digital signals can convey information with less noise, distortion, and interference. Digital circuits can be reproduced easily in mass quantities at comparatively low costs. Digital signal processing is more flexible because DSP operations can be altered using digitally programmable systems.

Which way to transmit signals is more reliable?

Digital signals are a more reliable form of transmitting information because an error in the amplitude or frequency value would have to be very large in order to cause a jump to a different value. Signals are composed of infinite possible values. Signals are composed of only two possible values: 0 or 1.

What are the two main transmission methods of digital signals?

Digital signals can be transmitted over transmission lines using either serial or parallel communication. With serial communication, the sequence of bits used to describe a value is sent in sequence along a single transmission line.

What is a disadvantage to analog information transfer?

Analog Signal Disadvantage:

The transmission rate is slow. The transmission quality is low. Data can be corrupted easily, and encryption is very difficult. Not easily portable, as analog wires are expensive. Synchronization is difficult.