The application of audiovisual multimedia content is still evolving. At present, there are two major trends. One is that the TV terminal will move to 4K2K ultra-high-definition (Ultra-HD) content. The source end of 3D multimedia is output to a large-panel TV for viewing. The corresponding interface technical requirements include the ability to charge mobile devices, the consistency of connector specifications, and even wireless multimedia transmission.
Obviously, HDMI is still the most mainstream interface when it comes to high-definition video interface. The next-generation HDMI 2.0 standard is expected to be announced before this (2013) year. According to the planning of the HDMI Forum meeting, this specification will increase the transmission rate to 18 Gbps and support 4K2K resolution of 60 fps and 25 fps. 3D format content.
Ben James, a global marketing engineer for multimedia test products, said that although the technical specifications of 4K2K are roughly finalized, the overall environment is still immature and lacks extensive support devices and rich content. Therefore, the demand for HDMI specifications in the market is still dominated by 1.4a, and there is no strong upgrade demand for the 1.4b specification. As for the 2.0 specification that will come out, it is to prepare for the market trend, and it should not replace 1.4 in the short term. specification.
Ben James, Marketing Engineer, Global Multimedia Test Products, NI
Under the effect of hens with chicks, MHL has become the only choice for mobile phone manufacturers despite the competition between MyDP and SlimPort. According to the MHL Association, Samsung, HTC, LG, Sony, Huawei, Acer, Lenovo, ZTE, Meizu, Pantech and other brands have launched mobile devices that support MHL, and the total number of shipments has exceeded one billion units. In contrast, mobile market support for MyDP is still rare, and SlimPort, which emphasizes very low power consumption, is only supported by Google's Nexus 4.
Multimedia test challenges
In response to the market trends and testing challenges of multimedia equipment, NI Technology Marketing Engineer Chen Jianan pointed out that the first is that analog technology is replaced by digital technology, which affects production efficiency due to the increase in test items, and increases costs due to complex test plans and instrument requirements; followed by The development from Full HD to higher resolution 4K2K has greatly increased the amount of data processed, requiring a more powerful processor and a wider bandwidth instrument interface; finally, the popularization of mobile multimedia applications requires high-speed interfaces such as MHL. With power supply capability, and a universal connector (microUSB) should be used.
Ben James further pointed out that the challenge of multimedia transmission today is that the transmission process of audio and video data will go through compression, decompression, and codec processes. It must be verified that the quality of audio and video has not been damaged. For the development of multimedia devices, especially mobile products, in addition to audio and video testing, it is also necessary to ensure that systems such as communication and power supply can work together and maximize the benefits. This is a great verification challenge.
With the increasingly complex and severe testing environment, Chen Jianan said that in addition to seeking more powerful testing capabilities in research and mass production testing, he also hopes to take into account both development flexibility and automation capabilities in order to reduce costs, shorten test time and accelerate system test planning . Faced with these needs, NI provides flexibility with a modular PXI architecture and proposes TestStand automatic scheduling tools to improve test accuracy and efficiency.
For PXI instruments, in addition to its own support for PCIe high-speed IO, it can provide more powerful processing capabilities through the upgrade of CPU, HDD, RAM, and NI has built-in high-efficiency FPGAs for its instruments, which can target audio-visual functions Carry out hardware acceleration planning. TestStand was born for mass production testing, which can help engineers quickly develop automated test and inspection systems. In practice, multiple sets of devices can be tested in parallel, or multiple test operations can be performed simultaneously on a single device, thereby greatly improving test output rate. And reduce the cost of test equipment.
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