# Device for presenting information

What is the principle of the **device for presenting information**, intended for its transformation or storage? The principle of such devices changed with the development of technology. The first were mechanical devices with manual, and then with a steam drive, electromechanical, electrical devices and, finally, electronic devices. Electronic devices for information representation are easy to convert and transmit electrical signals, low inertia of electronic devices and high speed.

Computing devices for presenting information in continuous form are called *analog computers* (AC), and using a discrete form - *digital computers* (DC).

Currently, digital information presentation devices are replacing analogue even from traditionally analogous areas such as television and telephony.

ACs have a block structure and represent a system of interconnected base elements, the composition and number of which varies for each task solved by the AC. As the basic element, an operational amplifier is used, consisting of an amplifier, input elements (E_{1}, E_{n}) and a feedback element (E_{fb}). As components, radioelectronic components are used: resistors, capacitors, inductors. Depending on the types of elements, the base element can add, integrate, differentiate over the input voltages (U_{in1} ... U_{inn}), the result of the operation is removed as an output voltage U_{out}). ACs are characterized by low accuracy of the result, since the radioelectronic components, under the influence of the external environment, change their parameters, which affects the accuracy of the solution.

The digital computers have the ultimate accuracy of information representation, because the information in them has certain limits, for the expansion of which it is necessary to increase the hardware or increase the processing time. The main advantages of digital computers are:

- guaranteed accuracy of the result, depending only on the boundaries of the data representation;
- universality - the ability to process data by any methods represented by a sequence of simple arithmetic and logical operations
- the possibility of implementing a large number of known numerical mathematical methods for solving problems.

Digital information display devices use a binary number system, one of the advantages of which is that a powerful Boolean algebra can be used to design devices. That is, when constructing functional nodes of digital information presentation devices, elements that implement the basic system of logical functions are used. One of these basic sets is a set of three functions: disjunction (logical OR), conjunction (logical AND) and negation (logical NOT). Using these basic elements, all the functional nodes of any digital information presentation device are built.