Tags: BER Eye Diagram
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In the analog era, the requirements for the source wire are very high, and the different grades used by the equipment or the brand's wire will have a big difference in the picture or sound effect. This is because the analog era is about ensuring the correctness of signal transmission without interference from the outside world, so the quality of the wire plays a crucial role in the correctness of the signal transmission; The price is one of the goods, which is the golden rule in the analog era. In the digital age, this rhythm was broken almost instantly. So undoubtedly HDMI cable has become the focus of many users competing to discuss. In principle, HDMI cable is a universal medium, and it transmits digital signals of 0 or 1. No matter the quality of the wire, as long as it can transmit data, the result is the same. In comparison, has there been no distinction between high and low grades in the digital age?
So before we get a deeper understanding of HDMI cable, we need to know some expertise.
Eye Diagram
The eye diagram is a pattern that can be observed on a sampling oscilloscope when testing the wire transmission performance with a professional instrument. Since the image obtained by the test is more like the human eye, it becomes an "eye diagram". From the eye diagram, the influence of crosstalk and noise between codes can be observed to judge the degree of the system transmission system.
The eye diagram is an important indicator to measure the stability and transmission quality of cables such as USB and network cable. The size of the eye opening of the eye diagram reflects the strength of crosstalk between codes. The larger the "eye" is, the more the eye diagram is. Corrected, indicating that the crosstalk between codes is smaller; on the contrary, it means that the crosstalk between codes is larger.
Threshold
The door limit is a more professional term that can be found in equipment manuals such as satellite TV receivers, digital set-top boxes, and network routers. He is the minimum signal strength and stability value that guarantees the machine's normal and stable operation. When the signal strength is above the threshold, the image signal can be received normally and the effect is excellent. When the signal strength is lower than the threshold, the image will suddenly disappear or mosaic will appear. There is no gradient from good to bad in the image quality. The process, commonly known as the "avalanche effect."
Bit error rate (BER)
The BER (bit error rate) is a measure of the accuracy of data transmission over a fixed period of time. Bit error rate = error in transmission / total number of codes transmitted. Here to clarify a concept, although digital transmission only has 0 and 1 signals, there are still errors, and it is usually stipulated that the error rate of audio bidirectional transmission should be less than one billionth.
Is there any version difference in the HDMI cable?
The difference between the version of HDMI is only the input and input port of the device. The wire itself is actually indistinguishable. This is a basic attempt, but many people don't understand it. The difference between the wire is in the production process, materials, length, etc. There is no version difference.
How long is the theoretical transmission distance of the HDMI cable?
In production, a single line can be up to about 20 meters (except for the type of built-in signal amplifier), and in practice, the longest distance is recommended not to exceed 10 to 15 meters.
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