Video technology initially developed from the establishment of cathode ray tube television systems, but later the invention of new display technologies expanded the scope of video technology. Television based standards and computer-based standards have been attempted to develop video technology from two different perspectives. Thanks to the improvement of computer performance and the broadcasting and recording of digital television, these two fields have new intersections and concentrations.
Computers can display television signals, video files, and streaming media based on movie standards. Compared with television systems approaching dusk, with the improvement of computing speed, storage capacity, and the gradual popularization of broadband, general-purpose computers have the ability to collect, store, edit, and send television and video files.

The basic working modes of RFID systems are divided into full duplex and half duplex systems, as well as sequential (SEQ) systems. Full duplex means that RF tags and readers can simultaneously transmit information to each other. Half duplex RF tags and readers can transmit information bidirectionally, but can only transmit information unidirectionally at the same time.
In full duplex and half duplex systems, the response of RF tags is emitted under the electromagnetic field or waves emitted by the reader. The signal of the RF tag is relatively weak compared to the signal of the reader itself on the receiving antenna, so it is necessary to use an appropriate transmission method to distinguish between the signal of the RF tag and the signal of the reader. In practice, people generally use load reflection modulation technology to load the RF tag data onto the reflected echo when transmitting data from the RF tag to the reader (especially for passive RF tag systems).
On the contrary, the temporal method involves the periodic short-term interruption of the electromagnetic field radiated by the reader. These intervals are identified by radio frequency tags and used for data transmission from the radio frequency tags to the reader. Actually, this is a typical radar working mode. The disadvantage of the timing method is that when the reader intermittently sends, the energy supply to the RF tag is interrupted, and it must be compensated by installing a sufficiently large auxiliary capacitor or auxiliary battery.