Before delving into the various features and applications of analog HD, it is necessary to make a specific finishing of these basic elements of analog HD, not to explain the contents of each analog HD format, but to all analog HD. The solution provides a description of the features, applications, and features that allow the reader to have a general understanding of a solution such as analog HD or coaxial HD.
First of all, in terms of the basic characteristics of analog HD, whether it is 960H, HD-SDI or HDCVI, HDTVI, AHD and ccHDtv, it is the same in both the coaxial system architecture and the upgraded coaxial architecture. It must be as simple as a traditional analog device, easy to use. And it must be able to directly use the ordinary analog coaxial line 5C-2V (RG-59U) or 3C-2V (RG-6), can carry out high-definition analog signal lossless transmission, and at the same time can break through the traditional analog image transmission The standard limit of 100-200 meters of technology can realize the installation of megapixel high-definition video image system without increasing the construction cost, improving the efficiency of the construction period, resisting the resistance to long-distance interference, and easily implementing the replacement. condition.
In the basic application elements, these 960H, HD-SDI or HDCVI, HDTVI, AHD and ccHDtv categories of coaxial HD format, in addition to inheriting the traditional ways of analog SD transmission and methods to reduce the complexity of construction deployment In addition, the application must also reduce the system reloading cost and reduce the maintenance complexity of the system equipment, and does not increase the technical difficulty of the construction. They must also be very suitable for the applicable environmental conditions of the old coaxial system, and can easily upgrade the SD standard definition simulation to the HD coaxial HD solution without changing the application configuration of the original system. In addition, the quality and price of these analog coaxial HDs must have significant room for growth in both the civilian and industrial vertical markets.
To summarize these basic elements, we can summarize them into six parts to explain the prerequisites for simulating HD:
1. Analog coaxial high-definition is necessary for high image clarity and high color separation and high signal filtering, high noise suppression and high image reproduction.
2. Analog coaxial high-definition, under the basic requirements of change, the transmission distance must be a longer distance signal transmission format under the existing coaxial cable.
3. Analog coaxial HD pictures must be real-time, no-delay, no compression loss and no distortion.
4. Analog coaxial HD back-end equipment must be compatible with high-resolution analog 960H image signals, considering future compatibility with traditional analog splitter and matrix systems.
5. Analog coaxial HD should be easy to use and operate, and support front and rear end setting functions to meet system application parameters.
6. Analog coaxial HD must have both low cost and high quality requirements.
Simulating high-definition commonality and difference
Analog Coaxial HD In addition to the above-mentioned basic elements of construction, do these 960H, HD-SDI or HDCVI, HDTVI, AHD and ccHDtv coaxial HD categories have other commonalities and differences? The answer is of course affirmative, but before we talk about commonality and difference, we may have to first give the 960H a high-definition traditional analog upgrade and HD-SDI and ccHDtv that are also coaxial upgrades but slightly different in commonality. Reduce the proportion of discourse, because the commonality and difference we will talk about here will focus on the difference between the structural components and the whole system, and HDCVI, HDTVI, AHD belong to this category can be used for equality and commonality. Analog HD categories with differences.
Speaking of the commonalities and differences between HDCVI, HDTVI, and AHD simulations, we can be sure that the adoption of components (refer to Figure 1) can create the similarities and differences of various analog HDs; unlike the 960H CCD specific use, On the front-end devices of HDCVI, HDTVI, and AHD, we can see the type of camera. The greatest commonality is that we will use the advanced CMOS and Exmor CMOS Sensor components with high resolution and millions of pixels, in order to get from the image source. The image quality is constructed in high-definition conditions. These sensors from Sony, Omnivision, Pixelplus, BYD and other suppliers have achieved the high-definition nature of analog HD, but different brand image sensors will bring a little difference in imaging.
Next, on the analog HD component, you will see another common situation, that is, an ISP image signal processing unit that the Sensor must match. This part of the chip will provide the final different rendering results of HDCVI, HDTVI, AHD and other analog HD. Because this part of the chip may be packaged in the Sensor module, it may also be included in the signal transmission Tx transmitting chip at the end of the HDCVI, HDTVI, and AHD cameras. However, due to the different types of ISP chips and component packages, plus these are from Sony, The ISPs of Fullhan, Nextchip, and Eyenix have different ISP performances, and some images are processed in the backend IC of the analog HD camera. The purpose is to improve the original image signals sensed by the Sensor. And each ISP IC design company's approach is different, it will mainly include BLC backlight compensation and wide dynamic WDR and noise suppression 2D, 3D DNR and 3A (Auto White Balance, AWB, Auto Exposure, AE) Different algorithms such as Auto Focus, AF) produce different results.
On the analog HD front-end, the last and most common commonality and difference lies in different analog HD modes, but the common signal-emitting chip, this chip will have different signal format output differences based on HDCVI, HDTVI, AHD. But basically the common point is a common chip consisting of image signal amplification and point pressure boosting and MCU control microprocessor. This transmitter chip allows different analog HD formats to transmit different signals. Transmission distance, and also in the same place in this part there is a switch circuit to handle HDCVI, HDTVI, AHD plus CVBS composite image signal.
In the common and difference parts, the transmission to analog HD is the same, all using coaxial cable, can be transmitted from 300C on 5C-2V (RG-59U) or 3C-2V (RG-6). - 500 m different equivalent power signals. Another common and difference worth mentioning is that on the back-end DVR recording management device, due to the monitoring and recording of high-definition image signals in analog HD, on the DVR recording device, no matter HDCVI, HDTVI, AHD An analog high-definition DVR must of course have a high-definition signal receiving chip with Rx, which is used to reduce the signal voltage to a digital signal equivalent to BT.656 or BT.1120 for digital recording. Compression control, which is common to all types of analog HD recordings. The possible difference lies in the difference between the performance of the compression coding chip and the possible use of TI, Hisilicon and possible Grain media in the performance and ISP image decoding processing, as well as the analog HD type linkable 960H and 720P and 1080P format analog HD. Signals, they are called Hybrid HD DVRs, and more analog HDs can be added to Intersil's Decoder chip and TCP/IP interface, allowing DVRs to connect analog HD signals in 960H and 720P and 1080P formats plus IP networks. The camera is connected to form a different model of the so-called Tri-brid HD DVR. All of the above are to exclude the parameters of the HDCVI, HDTVI, and AHD specifications, and to explain the commonality and difference in the composition of the analog HD.
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