The electrical signals used by analog electronic computers are the actual signals in nature, and all the processing processes need to be realized by analog circuits, which have complex circuit structure and poor anti-external interference ability.
Digital electronic computers internally process electrical signals called symbol signals or digital signals. Its main feature is "discreteness", and there cannot be a third symbol between two adjacent symbols.
2. The operating speed is different.
Analog computers are slow and basically no longer used; Digital computers are fast and widely used.
3, the scope of application is different.
With the development of digital computers, analog computers are replaced by digital computers, which are generally used as special simulation equipment and teaching and training tools. Digital computer has been widely used in scientific calculation, data processing, auxiliary technology, process control, artificial intelligence, network application and other fields.
Extended data
Brief introduction to the development of analog computer
In 1930s, we began to devote ourselves to the development of all-electronic analog computers. During World War II, Bell Telephone Laboratory developed the M-9 artillery director. After World War II, an all-electronic DC analog computer was developed at 1947 based on the operational amplifier in the M-9 artillery director.
The appearance of high gain DC operational amplifier has completely changed the development of analog computer. At the same time, all developed countries are developing analog computers. 1948, the first commodity simulation computer was developed.
Commercialization in 1950s; In the middle and late 1950s, China entered the field of modern analog computer development. In the mid-1960s, various types of analog computers were developed one after another. Large-scale hybrid analog computers such as M-2 and M-6 are the achievements of this period.
Digital computer classification
There are giant, large, medium, small, micro and single chip microcomputer, and computers often refer to the latter two. Microcomputer is also called microcomputer or microcomputer. Mainframes are mainly defined by performance. In the 1970s, computers with operation speed exceeding 6.5438+million times per second, storage capacity exceeding 6.5438+million bits and price exceeding 6.5438+million dollars were supercomputers in the world.
Some people regard an electronic computer with an operation speed exceeding 6.5438 million instructions per second and a main memory capacity of several megabytes as a giant computer. In the 1980s, the standard of supercomputers was a digital electronic computer with an operation speed exceeding 1 100 million times per second, a word length of 64 bits and a main memory capacity of 4- 16 megabytes. China's Galaxy computer is a supercomputer.
References:
Baidu Encyclopedia-Analog Computer
References:
Baidu encyclopedia-digital computer