Assortment of electronic equipment.
More and more devices, used by man, includes in its design electronic components. The systems of these elements can support the operation of electromechanical devices and facilitate their operation (for example. smooth regulation of engine speed in a drill or vacuum cleaner), automatically adjust the operation of devices in accordance with the assumed program (for example. maintain a constant, set temperature in the tank or regulate the operation of the car engine) and implement complex programs, controlling technological processes or robots.
Electronic systems can also act as transducers or support the operation of such devices, by changing the way information is transmitted. Such devices are: microphone, loudspeaker, radio station, radio, television, phone etc. By converting radio waves into electrical impulses and converting these pulses into acoustic waves or visible radiation, or by converting acoustic waves into electrical pulses and electromagnetic waves you can listen to the radio, watch TV or talk on the phone. It is this class of devices that is most often associated with the concept of electronic equipment. Signal processing also makes it possible to record the corresponding pulses to magnetic media. (Tape, magnetic disks) or optical (CDs), and then reading the records contained on them and transforming, for example,. for acoustic waves.
Currently, digital technology is increasingly used to transmit information and process it., which replaces the analog solutions used so far. The problem concerns the way information is recorded in signals transmitted by radio or in the form of electric current.
Analog signals are characterized by continuity of changes and accurately reproduce changes in the signal source, for example. radio waves change amplitude or frequency depending on the broadcast. Such a signal faithfully transmits information, while it is susceptible to interference in the form of other analog signals, which are then difficult to eliminate.
Digital signals are impulse signals. They are therefore a collection of pulses transmitted over time, from which, as a result of appropriate processing, an analog signal can be obtained. The digital signal can be encoded and saved, using binary notation (composed of zeros and ones), used in computer devices, it can also be processed relatively easily. It also has this advantage, that it is not so susceptible to interference, as analog and does not change or distort during transmission. Digital signals are easy to refresh, And, as a result of their processing, eliminate other unwanted signals from them.
Therefore, the conversion of the received analog signal into digital is increasingly used. (analog-to-digital converters are used for this), to process it in digital technology, and then convert back to analog (using digital-to-analog converters). Currently, the use of digital technology is not limited to signal processing.. Digital technology is used to transmit signals over radio waves, digital television is therefore introduced, digital radio, digital telephony.
Among the electronic devices, industrial and professional devices as well as amateur and household devices can be distinguished. The latter group of devices is mainly retailed.
Electronic devices can also be divided into devices of common use, for example. radios, Televisions, Phones, and devices used only by specific groups of users, for example. musical instruments, hardware, amplifiers and others. The use of such specific equipment requires proper preparation, as well as the trade in this equipment.
Electronic equipment includes:
• RTV equipment (radio and television), i.e. mainly radio and television receivers;
• devices for saving and playing audio and video (tape recorders, Videos, COMPACT DISC players, amateur TELEVISION cameras, turntables, etc.);
• electroacoustic amplifiers;
• telecommunications equipment (telephones, Radios, paging devices, intercoms, etc.);
• peripheral devices, i.e. equipment protecting the proper functioning of these devices, for example. Speakers, Microphones, Power supplies, Stabilizers, earphone, Antenna, antenna amplifiers, signal converters.
Separate product groups are: hardware, computational and electronic music equipment and electronic measuring devices, including watches.
Modern electronic equipment very often combines many different functions, while individual devices must be adapted to work together. Radios may contain devices for recording or reproducing sound, while the VCR, video camera and TV should work in one system, enabling them to cooperate, etc.. That's why for audio and video equipment, i.e. receivers, as well as processing equipment, Save (Recording) and audio and video playback, the generic name "audio equipment" has been adopted–video".