The information currently processed in computer systems is digital signals, because the information in the system is processed in binary numbers; digital signals refer to signals in which the independent variable is discrete and the dependent variable is also discrete. It is commonly used in computers. A binary number with a finite number of bits represents the size of a digital signal.
The operating environment of this tutorial: Windows 10 system, DELL G3 computer.
The information processed in the computer system is processed in binary numbers, so it is a digital signal
Digital signal refers to The variable is discrete and the dependent variable is also a discrete signal. The independent variable of this signal is represented by an integer and the dependent variable is represented by a number among finite numbers. In computers, the size of digital signals is often represented by binary numbers with limited bits.
Expand knowledge
The information age has arrived without warning, and we are surrounded by various signals all the time. , the essence of a signal is a physical quantity that represents a message (information). For example, in a common sinusoidal electrical signal, if it has different amplitudes, different frequencies, or different phases, it represents different messages (information). Data with signals as the carrier can represent any information in the real physical world, such as text symbols, images, etc. From the perspective of its specific expression, signals can be divided into: analog signals and digital signals.
Digital signals refer to using a set of special states to describe signals. Typically, signals are represented by the most common binary numbers. The fundamental reason why binary numbers are used to represent signals is that circuits can only Represents two states, namely, on and off of the circuit. In actual digital signal transmission, a certain range of information changes are usually classified as state 0 or state 1. The setting of this state greatly improves the anti-noise ability of digital signals. Not only that, in terms of confidentiality, anti-interference, transmission quality, etc., digital signals are better than analog signals, and they save more signal transmission channel resources.
The difference between digital signals and discrete-time signals lies in the dependent variable. The independent variable of a discrete time signal is discrete and the dependent variable is continuous. The independent variable is represented by an integer and the dependent variable is represented by a number corresponding to the size of the physical quantity. When the magnitude of a discrete-time signal is represented by a finite binary number, it is a digital signal.
Binary
Binary is a number system widely used in computing technology. Binary data is a number represented by two digits, 0 and 1. Its base is 2, the carry rule is "when two are entered, one is added", and the borrowing rule is "borrow one to be equal to two".
Binary numbers (binaries) are a carry system with 2-digit digits, and 0 and 1 are the basic operators; the basis of computer operations is the binary system. The basis of computers is binary. The commonly used base system designed in the early days was mainly the decimal system (because we have ten fingers, so the decimal system is a more reasonable choice. Ten numbers can be expressed with fingers. The concept of 0 did not appear until much later, so 1-10 and Not 0-9).
After the emergence of electronic computers, it was too complicated to use electron tubes to represent ten states, so there were only two basic states in all electronic computers, on and off. In other words, the two states of electron tubes determine that electronic computers based on electron tubes use binary to represent numbers and data. Commonly used bases include octal and hexadecimal. In computer science, hexadecimal is often used, while decimal is rarely used. This is because hexadecimal and binary have a natural connection: 4 binary Bits can represent numbers from 0 to 15, which is exactly the data that one hexadecimal bit can represent. In other words, converting binary to hexadecimal only requires conversion every 4 bits.
For more related knowledge, please visit theFAQcolumn!
The above is the detailed content of What signals are currently processed in computer systems?. For more information, please follow other related articles on the PHP Chinese website!