What are the differences between hard and soft pressure cards?
CPU usage, soft pressure is generally greater than 20%, and hard pressure is less than 10% (computer CPU usage generally does not exceed 5% before DVR operation). DVRs are devices that require long-term normal operation, and their stability is an important indicator. Therefore, the stability of the hard press card is significantly better than that of the soft press card. Hard compression is compression on the card, soft compression is compressed by the system CPU; that is to say, the hard pressure card itself is a DSP chip, and the video compression work is given to the DSP chip. The soft pressure card does not have a DSP chip, and can only rely on the CPU in the host for video compression processing. Of course, just looking at the CPU usage is not completely reliable, because some soft-press cards can also achieve low CPU consumption. Another way is to look at the chip, now the mainstream soft-pressed chips have philips7130, 878; hard-pressed chips have philips1300, 1500 and so on. It should be seen from the driver's information. The soft compression card, also called the video capture card, is mainly composed of one or more video capture chips and peripheral components and circuits. The circuit structure is simpler than hard compression, and the cost is far lower than the hard compression. This card is only responsible for collecting video, while video compression, decompression and other video processing are implemented by CPU operations. Hard compression card, also known as video capture compression card, the circuit board card and soft compression card is different, more video compression and decompression part of the circuit structure, video compression is not handed to the computer CPU to deal with, but a DSP chip To deal with it. Therefore, the hard compression card circuit is more complicated. The difference between a hard pressure card and a soft pressure card is that the hard pressure card compresses the video signal collected by the acquisition chip through a DSP (data signal processing chip, equivalent to a CPU) compression chip, and the soft pressure card has only the acquisition chip and no DSP. It compresses the captured video signal through the software on the CPU of the computer. Popularly speaking, the difference is nothing more than a question of whether the CPU is on the card or on the board. At first, there was a soft pressure card first, but because the CPU speed could not keep up, so a separate DSP was added to the card, and there was a hard pressure card later. Now that the CPU speed has developed rapidly, it can fully satisfy the stable operation of the soft pressure card, and the CPU price is also very low, so the soft pressure card has emerged in large numbers. However, you can't simply think that the hard pressure card is good or the soft pressure card is good. The schemes adopted by each family are different. The work is not the same, the software is different, the hard pressure is well done, and the work is done poorly. Well done, there are also bad things, the kung fu is mainly in software. The soft pressure card can now implement the H.264 compression algorithm just like the hard pressure. If the performance is good, it is not worse than the hard pressure, even better than the hard pressure. Domestic customers prefer to use hard pressure and foreign customers prefer to use soft. Pressure. The current technology tends to go faster than the market. I personally prefer the soft pressure card, because the hard-pressed DSP is more expensive and the cost is higher. From the cost of technology realization, the soft pressure is definitely lower than the cost of hard pressing. . Moreover, we have gone from MPEG 1 to the current H.264. Every time a technology upgrade is completed, customers who use hard-press cards need to repeat investment, and soft compression can be upgraded from MPEG 4 to H.264 through software upgrade; many people I always like to use less resources than the hard-pressed system, but I don't know how much extra system resources are wasted, and let the DSP that I spend more money to do the computing work. Just as people bought computer sound cards at the beginning, they liked to use hard sound cards with independent sound cards or integrated sound chips. Nowadays, most of the computers used are soft sound cards. The basic principle of soft compression and hard compression DVR Soft compression DVR, also known as video capture card, its basic principle: the camera analog video signal is input to the DVR card, the analog signal is converted into a digital signal by the video capture chip, and then directly or through the PCI bridge chip into the PCI, and then transferred to the memory, In the graphics card, the CPU executes the compression algorithm in the DVR software, compresses the huge video signal and stores it in the hard disk. Hard compression DVR, also known as video capture compression card, its basic principle: the camera analog video signal is input to the DVR card, the analog signal is converted into a digital signal by the video capture chip, and then transmitted to the temporary memory of the board, and then The card has a video compression chip to execute the compression algorithm, which compresses the huge video signal to a small size. Finally, these compressed ones enter the PCI directly or through the PCI bridge chip and are stored to the hard disk. Description: In the video compression chip article, the author once introduced that the video compression chip is divided into professional compression chip (such as: ASIC), which is the real hard compression, in addition to a class of DSP processor chip, in principle, using DSP compression It is the same as CPU compression. The soft compression operator is on the computer and the DSP operator is on the DVR card. At present, the so-called "hard compression DVR" in China mostly adopts the DSP architecture. Compared with the real soft compression DVR, only one processor is a DSP, and one processor is a CPU. The compression algorithm is the same as the carrier, and the principle is the same. With these understandings, everyone knows why the soft compression DVR still has the H.264 algorithm. It is not "hard compression".
Flake Graphite is a natural crystalline Graphite . It is shaped like fish phosphorus, and is a six-square crystal system. It is layered and has good properties of high temperature resistance, conduction, heat conduction, lubrication, plasticization and acid and alkali resistance.
Flake graphite is a natural solid lubricant of layered structure, rich in resources and cheap in price.
feature
The flake graphite crystallization is complete, the film is thin and the toughness is good, the materialized performance is excellent, has the good thermal conductivity, the conductivity, the thermal shock resistance, corrosion resistance and so on.
distribution
In December 2015, geological prospectors found a large scale graphite mine in alashan, Inner Mongolia. The total amount of graphite resources was 1. 300 million tons, about 7 of the world's recoverable reserves. 3%, average grade 5. 45%. According to the introduction, such high grade, large-scale Graphite Mineral deposits are rare in China. [1]
In 2013, the U.S. geological survey reported that the global scale of graphite minerals was less than 5 million tons. The discovery was made in alashan, which has a large scale of 703 million tons of graphite in the area of zahan mushi.
classification
Classified according to the carbon content
Like C %, 99.9% High Purity Graphite; Ninety-four percent of "C %" is High Carbon Graphite; 80% "C %" is Medium Carbon Graphite; 50% "C %" is low Carbon Graphite .
Classification by size of granularity
When the particle size is smaller than w38 micropowder graphite.
standard
Scale graphite standard GB T 3518-2008
apply
refractory
Flake graphite is widely used in the treatment of gold industry of advanced refractory materials and coatings. Such as magnesia carbon brick, crucible, etc. Military industrial firework material stabilizer, smelting industrial desulfurization growth agent, light industry lead pen, electric industry carbon brush, battery industry electrode, fertilizer industry catalyst and so on. The flake graphite is deeply processed, and it can produce the graphite milk for lubricant, deformable agent, drawing agent, conductive coating and so on. It can also produce Expanded Graphite for flexible graphite products such as flexible graphite seals and flexible graphite composite products.
dope
The flake graphite as the functional filler of coating is mainly used for anticorrosive coating, fire retardant coating and conductive coating.
As an anticorrosive material, it has anti-rust primer, such as carbon black, talcum powder and oil, which has good corrosion resistance of chemicals and solvents. If you add zinc and yellow to the formula, it is better to rust.
A graphite interlayer compound obtained from Natural Graphite scales as raw materials, chemically or electrochemically treated. Expandable graphite under the condition of heat, swelling volume (up to 300 times) suffocate the flames, at the same time generate inflation, to isolate the flame, delay or interrupt the effect of flame spread, and itself does not burn, good flexibility, high surface energy, intensity of carbonized layer. But the volume and dosage of the expansive body should be suitable. The test shows that the 150um particles, 30% expansion multiples and 5% dosage are the most suitable.
The flake graphite can be directly used as a carbon conductive filler and can be made into a composite conductive filler for conductive coatings. However, due to the large addition of graphite flake, the coating can be brittle and its application is limited. Therefore, measures are taken to further improve the conductivity of graphite and effectively reduce the amount of graphite flake. Our domestic chemical machinery research institute has developed a high temperature and corrosion resistant resin as basic material, with the strong ability of conducting electrostatic entities large flake graphite flake as the main aggregates, with high intensity of ontology Good abrasion resistance.
The anti - deformation cracking - good short - cut fiber material is a solvent - free thick film conductive coating. The coating has the characteristics of anti-corrosive media penetration, small residual stress, good anti-matrix deformation, stable construction performance and long - term conductive static. Can be used in oil tank inner wall guide electrostatic coating. With electroless plating technique, according to the data of graphite powders metallized, such as copper, nickel, silver, such as the preparation of composite conductive filler, with 30% of the amount used in conductive coating, not only its conductivity is very good, and further improve corrosion.
Flake Graphite Flake Graphite,Graphite Sheets,Natural Flake Graphite,Medium Carbon Graphite Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com
