Analog video signals have been known since the 1930s. At that time emerged the technologies that later led to the development of television. Typical of analog video signals is the line-by-line scanning of an interlaced image. At the end of each scanned line, a jump back to the beginning of the next line takes place, at the end of the entire (half) picture the jump to the beginning of the scanning field. This is called the interlace method. Until the 1980's, the scanning of an image for video purposes was typically done by the line deflection of an electron beam across a photosensitive layer.
Recently, magneto-optical methods are increasingly being used together with digital compression, such as in DVD camcorders. Since the late 1990s, the digital MPEG technology sets the standards. Based on it u. a. the Video CD, DVD and Digital Video Broadcasting (DVB). It is distinguished from DV by further improved image quality, greater compatibility in the PC era, as well as easier and more extensive editing options. The MPEG-4 format offers more compression than MPEG-2, but requires more processing power for both recording and playback. Also, MPEG-4 is more likely to experience quality loss due to compression artifacts. The very high density and quality of signal and its processing demand the adequate transmission ways. The traditional metal wires or radio frequency transmitters are for nowadays’ digital video signals not good enough.
There is a simple relationship between the frequency of the carrier signal and the amount and density of information that this signal is able to transmit properly. The higher the frequency, the larger the information capacity. Modern digital video signals contain so much information that the traditional carrier signal frequencies are not able to transfer them. The transition from very low frequencies of metal wires and radio, even microwave, to electromagnetic frequencies in the visible spectrum was a revolution in the processing, recording and transfer of signals. Fiber optics (FO) or fiber optic cables (FOC) are cables for the transmission of light, consisting of optical fibers and partially assembled with connectors. The light is thereby guided into fibers of quartz glass or plastic (polymeric optical fiber). They are often referred to as fiber optic cable, in which typically several optical fibers are bundled, which are also mechanically reinforced to protect and stabilize the individual fibers. Physically, optical fibers are dielectric waveguides. They are made up of concentric layers. At the center is the light-guiding core, which is surrounded by a jacket with a slightly lower refractive index and by further protective layers made of plastic. Depending on the application, the core has a diameter of a few microns to over one millimeter. A distinction is made between optical waveguides according to the course of the refractive index between core and cladding (step index or gradient index fibers) and the number of propagatable vibrational modes, which is limited by the core diameter.
Guarantees very high density of transmitted signal that provides for the highest flow capacity between video source and between transmitter & receiver. Connected in this way, the devices can fully show the best parameters of their work. Obtained in this way the highest image quality and a correspondingly high refresh rate will satisfy the expectations of even the most demanding users. Optical cables do not differ from traditional video cables in the easiness of assembly and creation of any connections. They are flexible and durable enough to be used successfully for many years, and their higher price is repeatedly compensated for by the excellent quality of data transmission.
Multimode fiber is a type of optical fiber that carries many modes (rays) of light, propagating at different angles to the axis of the optical fiber. In comparison with a single mode fiber optic cable, it enables transmission at a shorter distance without a signal amplifier. Such a possibility is of great advantage for users being quite short of money. This kind of transmitter & receiver connection is the newest technology of optic electronics. Such devices as the Thor Broadcast 4K SDI over the fiber converter or 3G/HD/SD-SDI or DVB-ASI over one fiber with 4K resolution. The third generation (3G) system of one of those three devices enables unrestricted radio access to the global telecommunications infrastructure via the terrestrial segment, both for fixed and mobile users. It is a system intended to integrate all telecommunications systems (ICT, radio and television).
All the users who decide to choose the top 4k video over fiber can be sure to use all, even the most stringent, parameters of their devices to play movies and video signals and enjoy the highest screen quality.
All the users who decide to choose the top 4k video over fiber can be sure to use all, even the most stringent, parameters of their devices to play movies and video signals and enjoy the highest screen quality.
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