analogy

In particular when used as the basis of interpretation or reasoning, the similarity or equivalence between the two situations, people or things.

Perhaps the simplest idea is a simple analogy. Hardware is like software, and television is a program that appears on it.

The world we live in has been simulated. We are analog. Any input that we can feel is analog. For example, sound is an analog signal, continuous time and continuous value. Our ears listen to analog signals, we say analog signals. Images, pictures and videos are simulated with source, our eyes are analog sensors. In order to measure the beat of the heart and to track the activity, it is necessary to process all analog sensor information. The computer is digital. Information is represented by discrete time and amplitude quantized signals using digital bits. This representation facilitates efficient processing and long term storage of signals and information. But since information and signals come from the physical world, we need to return to the physical world to perceive it. No matter how "electronic" our electronics are, they always require an interface that can convert the signals of the physical world into the electronic digital world.

Analog transmission uses analog signals, and digital signals are used for digital television transmission. Analog transmission includes transmission and reception of continuous signals. This is because the amplitude, phase, and frequency of the signal change in direct proportion to the physical quantity of the variable. Transmission is not interrupted. The impairment of this transmission is degradation of the signal, which affects the quality of the image. Digital transmission transmits information in the form of a bit stream (discrete data of 1 and 0). The waveform of the digital signal is a square wave representing discrete states of high (1) and low (0). Because the digital signal does not decrease, it is high quality. (Goldstein, 2009)

The main feature of digital computers and analog computers is the nature of the signal. Digital signals have two discrete states, on or off. The off state is usually 0 volts and the high state is usually 5 volts. Analog signals are continuous. They may have any value between the two extremes, for example -15 and +15 volts. The voltage of the analog signal may be constant or may change over time. With advances in technology, high speed digital computers can simulate the behavior of analog computers. For example, a program of a digital computer can calculate a sine wave of 2,000 Hz in real time with accuracy and reliability that analog circuits can not handle. The ability to simulate computer analog digital systems is limited