Digital coding is a coding that only uses numbers and related special characters to represent data and instructions.

Most digital coding uses position representation, that is, any digital quantity can be represented by the sum of some numbers. These numerical codes have different values according to their positions in the expression. In other words, each different position has its own "rights".

Decimal data system is the most familiar digital system, but it is very difficult or even unrealistic to use decimal data system in data conversion and computer processing. Ten different circuit states are needed to represent ten digital symbols respectively. But there are many ways to make the circuit show two different states, so the binary data system has been widely used.

Digital coding of digital data refers to converting binary 0/ 1 digital data into a square wave waveform (digital signal) with certain polarity, amplitude, bit rate and jumping rules. ?

Second, the development of mathematics and computer technology.

In the past 50 years, the extremely extensive and colorful methods and concepts pioneered by mathematicians, applied mathematicians and statisticians have formed a huge intellectual resource. The technical development and realization of this resource is the birth of artificial intelligence application software in engineering technology. Mathematics has entered a period with greater potential impact on the development of technology. Electronic computer provides an important channel for mathematics to all fields of science and engineering technology, and opens up a new era of mathematics.

Computer simulation and aided design based on mathematics and computer graphics have been widely used in various departments of engineering technology. Mathematicians and physicists can now reliably simulate very complex physical phenomena through computers. For example, the design of aircraft, the simulated flight of spacecraft, the test of atomic bomb and hydrogen bomb, wind tunnel test and other expensive test items can provide profound insights into these aspects through computer simulation and mathematical analysis.

Electronic computers are more and more deeply involved in various fields of mathematics itself, freeing mathematicians from some tedious and rigid logical reasoning and huge and complicated mental work, and making their intelligence more applied to truly creative work. It can also be used to effectively verify mathematical conjectures and theoretical results. The success of computer in solving the "four-color problem" in super-mathematics has brought great impact to mathematics, and its deeper significance lies in giving the mathematics community a new understanding of the great potential of computers.