How Digital Coaxial Cable Works

Digital coaxial cables employ exactly the same principles as other coaxial cables. The inner conducting layer is encompassed by an outer conductor and also the rubbery insulating layer beyond the cable. The digital signal is sent with the inner conductor mainly because it travels between components. During the course of its transmission, the signal routinely touches the outer conductor. The outer conductive layer is made with materials that are a reflector to the signal, thereby bouncing it back away of that surface. The signal continues to reflect in inner conductor until it reaches the receiving component.

Specializing in Digital Audio

Digital coaxial cable only has one purpose; to supply digital audio between components. This really is in complete contrast to RF coaxial cable which transmits both audio and video over the same path. As you could suspect, dedicating the whole bandwidth of your cable to sending only digital audio has excellent ramifications for your home theater's sound quality. This practice ends in greater signal fidelity regarding the transmitting oral appliance the receiving component. Greater signal fidelity signifies that the sound you hear from your property theater speakers will likely be truer towards the way the sound was originally recorded.

Benefits associated with Digital Coaxial Cables

Digital coaxial cable has the benefit of another associated with its dedication to digital audio. In the manner that signal transmission usually takes place, the digital signal on the source, a DVD by way of example, is distributed to a digital-to-analog converter (DAC). The signal is converted to analog and sent through the given cable where it reaches the receiving component on the reverse side. This component uses an analog-to-digital converter (ADC) to reconstruct digital signal as closely as you possibly can. During this process, errors and variations could be introduced to the signal leading to audible artifacts and distortions that diminish your house theater's sound quality.

In contrast to other audio cables, digital coaxial cable can transmit digital signals along its length with no need to convert to analog. Digital coaxial cable is capable of by-passing using this method and delivers a cleaner signal to your property theater receiver.

Applying Digital Coaxial Cables

Connections for digital coaxial cables is available on many methods from DVD players by theater receivers. If it uses digital audio, then chances are there's a manufacturer who's made that component with digital coaxial cables at heart.

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Internet in the "lan cable"

STP twisted-pair separation within the layer of metal film, the data transfer to reduce electromagnetic interference, so it has higher stability. The UTP cable is not within this layer of metal film, so it's less stable, but its advantage is price. UTP twisted pair with prices generally in the1 m 1 yuan, while the STP twisted pair on the might, and cheaper in dollars and 1 meter, you might dozen yuan to 1 meter. Generally purchased in the business where twisted pair twisted pair and the RJ45 connector to do, get it back into use on. If Xian Xin, can also be made, but need to buy a card pliers. A total of eight wire twisted pair, 8 wire routing rules are useful to 1236 lines, 4578 lines idle.

 Coaxial cable, is made up of layers of insulated wire wrapped around the central copper conductor cable. It is characterized by good anti-interference ability, stable transmission of data, better prices, also is widely used, such as cable TV lines. Thin coaxial cable generally the market price a few dollars a meter, not too expensive. And BNC coaxial cable used to connect the first, the market sell coaxial cable and BNC are usually the first connection has been good the finished product, we can directly use.

 Cable, is the most advanced cable, but it's more expensive, rarely used in domestic situations. It is fine as hair from the root of many of the glass fiber composition of external insulation sleeve. Because by light transmission, it is characterized by excellent resistance to electromagnetic interference, secrecy is strong, fast, large transmission capacity, etc.

 UTP's English name is Twist-Pair. Integrated wiring project is the most commonly used transmission medium.

 Twisted pair with each other using a pair of insulated metal wire strands each part of the way to resist the external electromagnetic interference. The two insulated copper wires twisted together with each other by a certain density, can reduce the degree of signal interference, each conductor in the transmission of radiation of radio waves will be another online radio waves off the root. "Twisted pair" name is derived from this. Generally consists of two twisted-pair copper wire 22-26 intertwining of insulation made of actual use, the twisted pair is more on the twisted-pair cable with the insulation wrapped in a sleeve inside. A typical four pairs twisted pair, there are more on the twisted-pair cable in a casing inside. These we call the twisted-pair cable. In the twisted-pair cable (also known as twisted pair cable), the different lines have different twist on the length, in general, twist 38.1cm to 14cm in length, according to counter-clockwise twist. Adjacent pair of twisted 12.7cm in length or more, generally the more twisted routes close its stronger anti-interference ability, compared with other transmission media, twisted pair in the transmission distance, channel width and data transfer speed and so on are subject to certain restrictions, but the price is relatively cheap.

Forecast the long-term present market of China cable tv and cable tv

Throughout 2010, the macroeconomic situation persists to be typically favorable electrical industry. But at exactly the identical time, because of China's financial rebound is not strong, as well as the existence of the quantity of uncertainties at home and abroad, it is doomed avenue of progress in 2010 could possibly be uneven.
Accordance using the appropriate plan, in 2010 commercial output worth of electrical industry, the complete product sales worth jointly with other financial indicators is anticipated to exceed three trillion yuan mark, an enhance of about 12%; complete income will attain 170 billion yuan, an enhance of about 10%. amid them, the energy technology items producing is nonetheless anticipated to attain 100 million kilowatts or more; energy transmission items within transformer kVA output will exceed 1.4 billion, is anticipated to develop 10%. To market the electrical marketplace to attain appear and quick progress from the marketplace within overall economy brought on by numerous troubles phone for concern as well as the marketplace shortly as possible.
First, the industrial sectors with extra ability nonetheless disorderly progress of cable tv and cable tv marketplace has extended introduced the phenomenon of over-development, but contemplating that last year, some neighborhood governing bodies within "expanding domestic demand, growth, protection and stability" policy-driven, within progress of high-end progress of new products and options or technology below the name from the merchandise is nonetheless invested heavily in new plant, the purchase from abroad, producing lines and items to expand producing capacity, very easily numerous hundred million dollars, 10 billion, twenty as well as numerous hundred million dollars, the development of the brand new round of repeated cost boom. Regardless from the dynamics of state-owned companies or private, however the huge vast majority of those finances invested occur from lending options from talk about banks. Currently, the cost tendencies to an previously over-development of significant extra ability problems within cable tv marketplace is superimposed, worse. Vertical high-pressure cross-linked cable tv producing collection (VCV), for example, domestic producing earlier to the accomplish of 2008 there are 32 (of which only just one is made in China), has obtained the items and getting positioned into operation in 2009 correct after 28 many years and, for just about any complete of sixty Article. Regardless from the genuine situation with this blind investment, not just wasting lots of riches, but also quite hazardous in the direction of the healthful and orderly progress from the industry. The completion of those producing lines, will are actually only 40% ability utilization using the domestic producing collection of VCV additional idle. At exactly the identical time because of overcapacity, it will reduce corners, shoddy, reduced costs as well as the phenomenon of counterfeiting jointly with other cut-throat rivals has turn out to be progressively serious.
Second, there are functions of domestic items is currently limited, in some regions of China, there are restrictions in some destinations the tendencies of domestic equipment, critically hampering the technique of localization of big equipment. to cut back the effect of financial turmoil on China's economy, the talk about issued a sequence of expanding domestic need to market stable and quick financial progress policy, the countrywide progress and Reform Commission jointly issued nine ministries from the "expansion of domestic need concerning the implementation from the choices and plans to market financial growth, additional strengthening bidding structure supervision look at "(Development and Reform Laws [2009] 1361). The document obviously defined conditions of prohibited discriminatory restrictions by setting using domestic equipment, and additional strengthen the structure supervision and control of tendering, bidding regulate present market purchase and enhance cost returns hold out an considerable role. structure within domestic-made items to restrict bidding, utilizing the phenomenon of discriminatory provisions are actually a massive level of containment, the progress of countrywide industries, to market commercial restructuring and upgrading of products and options to hold out an energetic role. But some places, some destinations from the middle rules turned a deaf ear, even versus the wind and, in big structure jobs bidding within discriminatory provisions nonetheless employed to restrict the domestic equipment. once the village Rail Transit collection (400V switchgear procurement) within sensitive documents, even a "tender products and options circuit breakers, contactors jointly with other factors should have two or extra underground utilization of performance, by which the major factors ( circuit breakers, contactors) should be well-known global vendors of discriminatory provisions, limiting participation within bidding actions of domestic equipment. The sensitive docs referred to within "major factors (circuit breakers, contactors)", domestic companies experienced to create and broadly employed in aerospace, airports, subways, electricity, machinery, petrochemical, metallurgical, textile jointly with other industrial sectors as well as the countrywide essential projects, that consist of Nuclear energy Station, substation Zhongnanhai, the Oriental Pearl tv Tower, etc., and work well. products and options of great best quality large stability, providing price usefulness characteristics. could possibly be stated the fact that present domestic 400V switchgear circuit breakers, contactors village is becoming in a placement to completely encounter the specialized specifications of rail transit project.
90 many years contemplating the fact that 20th century, the cable tv marketplace Beiyu Wei Cheng Shi "nervous" and "vessel", shoulder to all walks of existence supporting skills Guominjingji pillar industries, the progress of China's machinery marketplace within placement of 2nd biggest marketplace at the rear of the vehicle .
However, the output worth of China's cable tv industry, cable tv marketplace nonetheless accounts for only 15% from the earth about this large present market there are lots of gaps within progress of space and, getting developed. "Eleventh Five-Year" period, according in the direction of the countrywide economy's progress pace of 7% yearly enhance to 8%, the cable tv and cable tv marketplace progress pace could possibly be flat using the pace of progress from the countrywide overall economy is approximated at 8.5% or so. from the macro place of view, the whole of China cable tv and cable tv marketplace is in quick progress growth.
Development is rapid, troubles also emerged. especially within relatively reduced additional worth and low-end cable tv and cable tv products and options within market, reduce costs providing price rivals situation is really common. The marketplace believes that providing price rivals resulting merchandise may be the root direct to of blind cost and extra capacity, provide exceeds demand. concerning the just one hand, the cost threshold is low, resulting within influx of the large amount of enterprises, resulting in firms within of the industry, "excessive." producing ability in these sectors exceeds the present market demand, a substantial surplus. concerning another hand, the "threshold" is low, the marketplace concentration is not just getting much less and less, but also element from the producing does not possess the capacity, best quality manage and testing, jointly with other needed implies "workshop enterprise" is becoming eliminated within industry, and turn out to be fake, shoddy, shoddy work, shoddy products, the producing from the supply cable tv and generate lower providing costs jointly with other implies by virtue of disrupting the present market rivals order, aggravated disorderly rivals within of the industry.
At present, China's cable tv marketplace has observed extra than two decades, has made great progress, but nonetheless not out from the cycle of large but not strong, and world-class companies are nonetheless a massive gap compared. There is reduced commercial concentration, lots of companies and small-scale, economies of scale is not enough, insufficient ability of impartial innovation and merchandise structural contradiction, and lots of other issues. regardless of those problems, but China's cable tv marketplace is facing new possibilities to hold off, that quick enhance in progress possibilities for its main competitiveness. using the altering earth economy, China's cable tv marketplace may be also bound to get restructuring, shuffle. China's financial progress in latest many years in particular, find energy, the bottleneck problems of energy shortage, the talk about has constantly amplified the cost in electricity, producing the marketplace entered a quick progress period. put into practice the middle federal government to enhance infrastructure, producing deployment of stimulating domestic demand, the talk about Grid institution strategies to enhance cost and accelerate the pace of energy grid construction, is anticipated to invest the up coming two to three many years will exceed one trillion yuan, of which the village as well as the major farm system grid structure and transformation cost 790 billion yuan. The scale of structure is 110 (66) 26 kV and above transmission lines a massive variety of meters kVA transformer ability of 1.35 billion.
Power cable tv producing marketplace belongs in the direction of the very first energy transmission items industry, the technology was relatively reduced boundaries to entry is low, customers are largely the countrywide grid company, a present market framework led to numerous items vendors partial the loss of pricing power, the whole marketplace by applying the quick extension after which find the problems of increasing raw product prices, the marketplace progressively competitive, income a downward trend; Erci energy transmission items marketplace is really a cyclical marketplace is relatively small, and its associated high-tech field, specialized boundaries to high, from the few monopoly of large companies. In look at from the progress potential customers of China's electrical energy industry, cable tv and cable tv producing marketplace as its sub-sectors, driven in large natural environment nonetheless has great space to develop.

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Coaxial cable transmission

Transmission system monitoring and control system equipment and terminal equipment front-end link. Front image signals generated by the equipment, sound signal, various alarm signals transmitted through the transmission system to the control center and control center of the control commands sent to the front-end equipment. TV monitoring system according to the size of coverage, signal transmission distance, the information capacity of the system's function and quality indicators, and the transmission signals of different types of requirements can use different transmission methods. Large amount of information as image signals, bandwidth is wide, when monitoring intuitive, and therefore the focus of transmission is the transmission of video signals.

Advantages of coaxial cable

Coaxial cable is very special, may be called "High King." 600MHz regarded as the limit of the twisted pair, and the coaxial cable, this is only a mere trifle.

Coaxial cable and wire in the rate of the signal around the material (dielectric) is directly related to the choice. Using solid polyethylene transfer rate is 66% of the speed of light using 78% polyethylene foam, a new nitrogen into the (nitrogen-gas-injected) dielectric is 86%, shown in Figure 2. Use of this material means that most of gas within the cable. However, as small bubbles, the density of plastic is still high, the bending wire cables can remain in the center.

In the twisted pair of wire bonding method is sometimes used for coaxial cable, this method can make it smaller, lighter and cheaper. Also, because no plug, and more simple to install. As the bonding process does not use glue, peel without glue residue, and no extra plastic. Cut with pliers, the hand will be able to separate coaxial cable. This coaxial cable can reach 3GHz, can be used in analog or digital video, RGB, and can achieve even higher resolution QXGA VGA

Select the microphone cable systems should be the issue

In recent years, both for comfort and energy efficiency reasons, air conditioning and lighting systems are increasingly using electronic digital control technology. The numerical control system wiring in the weak will microphone signal line generated electromagnetic pulse noise.

Microphone cable carrying the signal amplitude range of 1 / 100 V (10mV) ~ 1 / 1, 000,000 volt (1μV) between the wiring cable selection process or a small error in the microphone system may be collected into a big noise antenna.

The following sections summarize by way of Q & A microphone system configuration problems.

Q1. What should be used under the conditions of the two core Mac cable?

Two core cable Mike does not apply to noise as a major consideration and a high level audio signals, can reach-20dB ~ 0dB environment. At this point, the two core cable show their small diameter, low-cost advantage. Of course, if not the line level but the microphone level, it should use the four quad-core cable line.

Q2. What conditions should be used four quad-core Mac cable?

More important factor in the noise, or signal level only-50dB or less environment should use four quad-core Mac cable. And compared the two core shielded cable, this cable can block out 90% of the noise

However, if such a cable with large-capacity power cables along the alignment, in order to secure that it should be penetrated into metal tubes.

Q3. Quad quad cable is not expensive?

The cost of this cable has greatly declined in recent years. Decades ago, only large concert halls and professional radio stations can afford them can be used. In 1981, Canare has developed the cost of using the aluminum foil shield four quad-core cable. In addition to traditional professional equipment other than that this cable in many non-traditional areas such as wedding halls, classrooms and other schools have also been widely used up.

Q4. If you do not use metal conduit, Mike cable should be far away from power cables?

If using metal conduit, can be found from Figure 3 should be left between the cable spacing. Note that if the fabric without regard to discharge the cable spacing problem, are prone to noise problems in the future is very delicate. Since Mike's signal cable is very weak, so it should be possible to use metal conduit.

 

Q5. In the use of current when a very large cabinet, which issues should be considered?

And question 4 (do not use metal duct should be considered in the problem) the same answer.

Q6. Use soft cloth metal conduit cable discharge What are the disadvantages?

Metal hose can reduce the noise, but not as effective metal hard pipe, it is recommended to use metal hose threading the cable line spacing should be left.

 Q7. What is the "wave masking"?

With corrugated metal shield is made of spiral wound around the cable shielding layer formed mainly used for underground cables. The shielding effect between the bare fabric cable and metal pipe threading between the disadvantage of poor flexibility, be particularly careful when bending.

Q8. Mike Cable There are many types, selection criteria, how?

The same types of shielding, they are only on some specific aspects of different uses according to the specific requirements to select the cable type.

Braided copper shield

No matter how many times through the bending, winding, twist, or retractable, shielded copper network can maintain a good shielding ability. As a hand-held cable or extension cable is ideal when using this type. In order to ensure a high shielding ability, which was especially fine cable knit, so than other types of cable costs are expensive, better results. It does not end processing needs of professional experience.

Spiral shield

Spiral copper shield around the cable is tightly wound as spiral. Wound twice around the opposite is also known as "double-helix shield" better shielding. Prices are between spiral shield and foil shield bronze mesh screen between the price. Although no side deal with relatively simple, but very active shielding performance will not spiral down, spiral shield is designed for fixed installation.

Aluminum foil shield

Molten aluminum foil shield is made of polyester film with aluminum foil, aluminum foil with a wound cable. The cable line is not end of treatment simply, the price is also cheaper for fixed installation. The need to pass through metal pipe laying aluminum foil shielded cables, be sure to use the rope filled with variety. When the threading operation, filling ropes to protect cables not due to excessive force and kink or retraction. Aluminum cable is now widely used in multi-function hall, stadium and other environment.

HDMI cable description

HDMI: HDMI full name in English is "High Definition Multimedia Interface", which means Chinese High-Definition Multimedia Interface. HDMI interface can provide up to 5Gbps data transmission bandwidth, can send uncompressed audio signal and high-resolution video signals. At the same time without the signal before transmission / A or A / D conversion, can guarantee the highest quality audio and video signal transmission. HDMI and DVI on the pin-compatible, but with a different package. Compared with DVI, HDMI can transmit digital audio signals, and increased support for HDPC, while providing a better DDC optional features.

Introduction

HDMI supports 5Gbps data transfer rate of 15 meters can be transmitted far enough to deal with a 1080p video and an 8-channel audio signals. And because of a 1080p video and an 8-channel audio signal needs less than 4GB / s, so there is great margin HDMI. This allows it to be connected with a cable DVD player, receiver and PRR. In addition, HDMI supports EDID, DDC2B, so has the HDMI device has a "plug and play" feature, the signal source and display devices will automatically be "consultation", automatically select the most appropriate video / audio formats.

Advantages

Consumers the benefits of HDMI

100% Digital

No compression, no conversion

Directly from the source of pure digital picture and sound (you can see and hear)

Video and audio signals from the output device to the display device to keep the number of

The best quality of sound and image

HDTV provides the bandwidth for the

Support for 1080p and higher resolution

More than twice the bandwidth of 1080i

YUV color space to provide support

Just a cable

A cable is included in all HD video and audio

Instead of up to eight audio and video line 5

Reduce wiring complexity

Automatic Format Intelligence *

TV and AV Receivers can adjust without consumer intervention

Video source to receive the display device supports the video format and output the ideal audio and video formats

Display stood to receive from the source video format and aspect ratio image

Consumer Electronics Control *

Entirely from a single remote control of the home theater

Achieve advanced features, such as "one key play"

l      These features are achieved in accordance with manufacturers