Chip compatibility design

During the transmission process of IP HD, compression coding and decompression are required. During the transmission process, there will be problems such as packet loss and network congestion, which will lead to delays in the video screen. Moreover, IP HD has security risks such as instability and crashes. As well as the complicated integration and integration of various brand products, the market increasingly favors HD-SDI high-definition products with good stability and real-time effects.

Jin Yubei, manager of the marketing center of Hengye Intelligent Security (Shenzhen) Co., Ltd., said that although the SDI chips are all backward compatible (1080P, 1080i, 720P), in addition to the large amount of video data, the design should also be evaluated CPU performance, and in terms of parallel data processing capabilities. At the same time signal output interface: including serializer (Seralizer), cable driver CD (CableDriver) and other circuits are also aspects to be considered. Among them, the serializer is also called a transmitter (Transmitter), which mainly realizes the modulation of the 10BIT / 20BIT video data output by the CPU into a standard SDI signal according to the coding standard specified by SMPTE and sends it out.

At the same time, the digitally encoded image signal format of the HD-SDI camera still has compatibility problems with HDDVR of different brands, and the HD-SDI camera will have different degrees of interference when transmitting with different HDMI cable materials.

In fact, for designers, they are more concerned about chip compatibility. Some semiconductor manufacturers such as NS and GENNUM have the same three equalizer (EQ) pin packages for different manufacturers. Each chip is backward compatible, such as supporting 3G rate, HD-SDI, etc. Replacing the corresponding EQ model of the equalizer, the hardware design and the PCB do not need to be changed to greatly reduce the development cost. At the same time, it also aims at different customer needs and realizes the diversification of product types.

Furthermore, low-cost FPGAs can also meet the requirements. The front-end receiver (Receiver) integrates circuits such as cable equalizers EQ, SERDES, etc., resulting in increased cost of FPGA front-end devices. The main function of the receiver is to realize the conversion of SDI signals into 10BIT / 20BIT parallel data output. The specific scheme adopted by the receiving end needs comprehensive consideration:

1. A certain amount of FPGA development experience is required, the period is difficult to predict, but it is easy to maintain and the product functions are easy to diversify.

2. The conversion and processing of SDI are basically realized by hardware chips, and the development cycle is short, which can quickly bring the products to the market.

HDbaseT regards network cable as AV signal cable

Using the network cable to run high-definition audio and video signals is of course fresh. Just like our DVD or BD Blu-ray players, even the periphery of the handheld device is connected to the TV screen, and the network cable is used as the signal cable. The penetration of Netcom-related technology forces cannot be small, but it is indeed rare to play in this aspect.

As early as 2010, the HDbaseT Alliance has used the five-in-one function of power, control signals, network information flow, audio, and high-quality video to play on the HDMI interface, so it can also be easily viewed as a HDMI cable. . In addition to ValensSemiconductor, including LG, Samsung and Sony are core members, it is not difficult to feel their ambition.

With the lessons learned from the SDI solution, HDbaseT is now more confident in promoting the solution to the security market. Lin Haoyuan, director of Asia Pacific for Valens, said: "Our biggest competitor is ourselves! While other solutions have been dedicated to the delivery of HD images, and VS020 has just started, it has already had an inherent advantage in terms of specifications."

Return to the essence of security design

In addition to choosing a plan, there are several alternative technologies for security, which can be ruled out first to avoid additional obstacles to R & D and application.

The first is the cumbersome setting of TCP / IP between the camera and the storage device. Must high-quality images be achieved through network equipment? What is the impact of image compression on the front end? Where is the data format used for image analysis?

The above HD transmission chip supply end has been demonstrated using a high-speed connection scheme without compressed images. However, if we care about the security engineering end, we will surely be able to perceive the above idealized solution. The SDI transmission format list name standard bit rate image format has a new threshold: instant uncompressed (RAWData) transmission! To fully implement this request, it is by no means The cost of replacing only high-quality wire can be easily achieved. HD video is indeed a security monitoring product trend, and it is irreversible; however, what is HD video? "Uncompressed" must not be within the definition, otherwise we have seen DVDs, Blu-rays, Internet movies, and even HD-level network cameras They are not qualified to say that they are high-quality, because these sources are all compressed.

ccHDtv uses digital TV technology to transmit security images

Song Zongxian, product manager of Songhan Technology, said that he believes that there must be a new design kinetic energy, which comes from the demand for HD images, and takes into account the convenience of transmission and management. It allows the industry to accumulate intuition and trust; without the cost of extra relay transmission, moderate compression processing can also be tolerated, and it is also convenient for IP Netcom's architectural integration.

Perhaps, we can expect that such a security photography solution will be the focus of a new wave of IC design products invested in security.

Speaking of the ICs of Taiwanese manufacturers, cutting into HD security provides the most dazzling representatives of Tx and Rx. From 2012, it should be ITE Lianyang Semiconductor and the ccHDtv architecture they promote.

They not only fully realized the above description of HD and non-IP architecture, but also borrowed their accumulated experience in the field of digital TV, the proposed technology is essentially DVB-T solution, which can be realized by coaxial cable "cascade" and "parallel "Connect" and other methods to pull back to the storage management, which really saves the cost of wiring. Through the "many-to-one" and "one-to-many" flexible distribution management, inject fresh research and development direction into the HD security field.

Some people may find that such a structure may be new in security, but digital TV (especially in Europe) has been in operation for many years in the fourth industry. The TV channels watched in the car are transmitted wirelessly through DVB-T.

This means that the possibility of HD wireless is also the architectural advantage of HDcctv.

Lai Shengzhong, senior marketing manager of Lianyang Semiconductor, said: "Wireless may have channel management considerations in Taiwan, but if it is in a closed circuit system, there is no such layer of regulations and security concerns at all." This statement is very pragmatic and close to the security system. Engineering live. He added: "The Tx chip built at the end of the camera is a new IC developed for security with reference to the views and needs of all parties, hoping to make the Taiwan industry have a solid and innovative solution."

When we focused on various HD-SDI chip architectures of HDcctv, including FPGA, discrete and integrated chips; we refer to the HDbaseT that goes on the network line, and have the advantages of multi-function integration; look back at the ccHDtv architecture promoted by Taiwan It is applied to security by using the mature technology of DVB-T; obviously, the demand for HD images by security is self-evident, and non-IP has always been listed as one of the necessary design considerations.

No matter what kind of design route we are taking, we look forward to a living water spring that can open up application forms and also have endless technical support.

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