The code rate is Mbps. We know that analog signals also called continuous signals are sampled and quantized into signals that are not continuous in time and in amplitude also called discrete signals. Such signals are not yet digital signals and need to be converted into digital symbols Such as natural binary code , this code stream is not encoded by the baseband signal compression, larger code rate, take up a larger transmission bandwidth, this code stream transmission interface is SDI interface, also known as serial digital interface, It belongs to the channel code stream, so the SDI transmits a digital video signal that is not compressed after the sample is quantized you can also embed the audio.
SDI interface cannot transmit the compressed digital signal directly. After the compressed signal recorded by devices such as digital video recorder and the hard disk drive is played back, it must be decompressed and output through SDI interface to enter SDI system. Repeated decompression and compression, will inevitably lead to image quality degradation and delay increase, for which a variety of formats of digital video recorders and non-linear editing system, provides its own interface for direct transmission of compressed digital signals.
HDMI is the first digital interface that supports all digital high definition, multi-channel audio and smart format and control command data transmitted over a single cable without compression.
HDCP technology by Hollywood and the giant semiconductor Intel co-launched, it can be actually used in video cards, DVD players and other transmission ends, as well as monitors, TV sets, between the receiving end of the projector. Is an important anti-piracy technology for high-definition movies and television programs.
The cable length of the DVI port can not exceed 8 meters. After scrambling, the chance of continuous "1" is reduced.
The SDI interface cannot directly transmit compressed digital signals. After the compressed signals recorded by digital video recorders, hard disks and other devices are replayed, they must be decompressed and output through the SDI interface before they can enter the SDI system. If you repeatedly decompress and compress, it will inevitably cause the image quality to drop and the delay to increase.
For this reason, various digital video recorders and non-linear editing systems of different formats have specified their own interfaces for the direct transmission of compressed digital signals. Search only containers. Search titles only. Search Advanced search…. New posts. Search forums. Log in. Install the app. Contact us. Close Menu. Welcome to EDAboard. To participate you need to register. If you are a headend engineer then probability you have gone threw ASI signal.
We have seen some digital headend devices like encoders provide the ASI Signal output. ASI is Transport Stream mechanism or protocol which used in headends and satellite broadcast etc. This Mbps data rate is very high so it can support many different transport stream applications.
Thus ASI signal is final output after the video compression. ASI signal is carried in 75 Ohm coaxial cable.
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