中国深圳,卫星电视接收机生产厂dreambox DM800HD PVR

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Greatdvb Digital technology is a China based manufacturer specializing in satellite -receiver, FTA-receiver, free-to-air-receiver, metabox-receiver,dreambox- receiver,starbox receiver,openbox-receiver,visionnet-receiver,card-sharing-receiver,Digital Satellite Receiver,Digital Satellite Receiver Manufacturer,Digital Satellite Receiver Manufacturers,Digital Satellite Receiver Exporters,Digital Satellite Receiver Exporter,Digital Satellite Receiver Factory,Digital Satellite Receiver Factory,Digital Satellite Receiver Suppliers,Digital Satellite Receiver Supplier,Digital Satellite Receiver Producer,Digital Satellite Receiver Producer,Digital Satellite Receivers,China Digital Satellite Receiver. We are China manufacturer has our own factory in Shenzhen.

中国专业的高端机顶盒生产厂

卫星电视接收机: Dreambox 系列: Dreambox DM800HD PVR-S Dreambox DM800HD PVR-C Dreambox DM600PVR Dreambox DM8000HD PVR Dreambox 500S Dreambox 500C	声明:本公司产品全部外销,此中文网页仅供海外华人华侨参考,谢绝国内个人用户咨询.


	中国专业的高端机顶盒生产厂

	Satelliten-Receiver: Dreambox (Cardsharing Modell)

	Dreambox 800HD (dreambox 800S)

	Dreambox 800HD (dreambox 800C)

	Dreambox 600PVR

	Dreambox 500S (DM500S)

	Dreambox 500C (DM500C)

	Dreambox DM8000HD (DM8000S)


	digitalen terrestrischen Receiver DVB-T MPEG4 HD

	H18A

	ISDB-T MPEG4 HD Set Top Box

	ISDBT-001

我们的产品已通过CE、FCC、UL、SGS、3C等认证。长期以来，本公司对产品质量拥有一整套严格的质量控制体系，从原材料的购入、产品生产、产品检测到营销全过程，严格按ISO9001：2000国际质量认证体系执行。

Email: sales@greatdvb.com MSN: eric@greatdvb.com Skype:satellite-receiver ICQ:337-873-471Tel: +86-755-888 40248 Fax: +86-755-888 45123

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Your choice from among the various satellite receivers now on the market will therefore depend largely on the nature of the satellite TV program services which you desire to view from the comfort of your easy chair. Some satellite TV programs are broadcast in the clear and are therefore considered "free to air" (FTA), while others may be encrypted and only made available to subscribers living within a particular region or individual country. There also is an important distinction to be made between satellite TV services which are transmitted in an analogue format and those that are digitally compressed. Analogue communication signals are electromagnetic waves of energy which vary in frequency (called frequency modulation, or FM) or intensity (called amplitude modulation, or AM). Digitally compressed TV signals, however, are broadcast in an alternate format consisting of a series of binary digits or "bits" which correspond to the on and off states of computer logic circuitry. Only one manufacturer currently offers a dual-purpose satellite TV receiver which can process both analogue and digital satellite TV signals and its use is restricted to the North American market.Analogue Satellite TV Receivers.The cost of an analogue satellite TV receiver will depend on the number of features which it offers to the consumer. Some low-cost satellite receivers can display TV images which equal or even exceed the picture quality offered by more expensive units. The downside is that the operator will have to remember and execute all of the little adjustments needed to tune into each and every satellite TV broadcast. In some cases, the receiver may be a stand-alone unit which, by itself, can only receive programs from a single satellite. Most analogue satellite TV receivers these days, however, also feature built-in antenna controllers which can steer a motorized dish from one satellite to any other. Many of today's high-end satellite TV receivers are actually task-specific computers which contain advanced microprocessors and memory storage circuits. Each receiver comes with factory installed software programs which automatically perform all the various tasks required to receive the available satellites and satellite TV services. For example, many receivers come pre-programmed with the locations and tuning parameters for all of the available satellite TV services stored in a memory circuit. The receiver's wireless remote control can be regarded as the keyboard, while the TV set serves as a computer screen which can display a variety of menus that the installer uses during the initial installation process and which the TV viewer can also use to customize the IRD to suit his or her specific viewing needs. All satellite TV receivers are designed to maximize the strength of the incoming satellite signal or "carrier" while at the same time limiting the amount of noise either contributed by external sources or generated by the satellite TV system's internal electronic circuitry. The figure of merit for an analogue satellite TV receiver is defined as a "threshold" point expressed in decibels (dB) at a specific carrier to noise ratio or C/N. When the receiving system's C/N (which is measured in decibels or dB) falls below this threshold point, impulse noise or sparklies rapidly appear in the TV picture rendering it unviewable. The lower the receiver's threshold rating, the better it will operate under low signal receiving conditions such as when the antenna's diameter is insufficient for receiving a low-powered satellite transmission. Receiver threshold ratings ranging from 6.5 to 10 dB C/N commonly are encountered in the product literature. The problem with relying on this specification as a benchmark for receiver evaluation is that not all manufacturers measure the threshold performance of their products in the same way. The best way to evaluate receiver performance is to have the retailer connect it to a dish with the same diameter as the one that you intend to install at your home and actually see how it performs while receiving several different satellites. Analogue Receiver OptionsThere also are a wide variety of optional features which may be offered by different receiver models. While none of these options are essential to satellite TV viewing, they may allow you to improve the performance of your system or dramatically simplify its operation. Filters. Many receivers offer noise reduction filters which can be used to improve your reception of the weaker satellite TV channels. Keep in mind that these filters lower the receiver's threshold point at the expense of video fidelity. When the noise reduction filter is engaged, for example, sparklies may be removed from the image, but other impairments will be noticeable, such as picture tearing when video graphics containing saturated blues or reds appear on your TV screen. In some areas, the local telephone company, or other terrestrial communications services, transmit microwave signals which can adversely affect your satellite TV reception. This phenomenon is known as terrestrial interference or TI. Some receivers provide special TI filters which can be used to reduce or eliminate TI problems that may plague your reception of certain satellite TV services. Automatic VCR Timer. This is a desirable feature for anyone who would like to automatically tape satellite TV broadcasts for later viewing. In this case, the receiver must have its own internal clock for keeping track of time. The receiver can then be programmed to receive a specific satellite and satellite TV channel at the selected time, regardless of whether you are home or not. Most units offering this feature can be programmed to receive multiple events over a period ranging from two to four weeks. Don't forget that you also will need to ensure that the VCR's clock is synchronized with the satellite receiver's clock and that the VCR is programmed to record at the same times that you have programmed into the satellite receiver's VCR Timer. Auto Peak. The auto peak feature allows the operator to fine tune system performance if there has been a noticeable degradation in the quality of reception from a given satellite or satellite TV service. For example, a wind storm or wayward soccer ball may have pushed the dish slightly away from its normal alignment. When the auto tune feature is engaged, the receiver will measure the signal strength of the incoming signal while it moves the dish back and forth and fine tunes the channel frequency and polarization settings. The receiver will automatically select the settings at which it obtained peak signal reception. The operator can accept the new settings and store them in the receiver's memory or return to the settings previously stored in memory. This auto peak feature is not practical for use with systems which use antennas less than 3m in diameter. On smaller dish systems, the receiver may lock onto a signal coming from an adjacent satellite and you'll be lost in space before you know it! Parental Lockout. This feature allows the operator to designate certain satellite TV channels as off-limits to children. An on-screen menu allows the receiver operator to program the receiver to pick up these channels only after the viewer has entered a secret password. On some IRDs, the parental lockout feature can also be used to prevent inquisitive children from accidentally changing the primary tuning parameters of the system. Favorite Channels. Some of the high-end receivers allow the operator to create a customized list of favorite video and audio services which can be used for program selection. In this case, the TV viewer does not have to remember the name of any satellite or the channel number of a given satellite TV service. The operator merely displays the favorite channel list on the TV screen, selects the desired service and the satellite receiver does the rest. Couch potatoes of the world unite. Analogue Satellite TV IRDs All of the previously mentioned features and options for analogue TV receivers are also provided by any top-of-the-line IRD, short of integrated receiver/descrambler. The main difference between an IRD and a receiver is that the integrated receiver/descrambler also contains a module which can decode those TV program services which have been encrypted to prevent unauthorized reception. For example, the STAR Movies service on the southern beam of AsiaSat 1 uses the STARCrypt encryption system, while other analogue TV programmers in the region use B-MAC, Nagravision, SmartCrypt, Syster, VideoCrypt or some other encryption system. Since none of these encryption systems are mutually compatible, you'll need to take care to select an IRD that is fully compatible with the encrypted program service or services which you want to view. Keep in mind that you also will have to pay a subscription fee before the programmer will allow you to receive an encrypted satellite TV channel or a package of services. Each IRD contains a unique multi-digit address number which is installed at the factory. The satellite TV programmer's authorization center sends a coded "conditional access" message over the satellite which includes this unique address. This authorization message can turn on an individual IRD so that it can receive a particular service or group of services, or turn off an IRD in the event that the subscriber fails to pay the required monthly subscription fee. This coded message is sent directly to each IRD over the satellite along with the encrypted program signal. What's more, the authorization center can use this addressable feature to selectively turn off and on large groups of decoders. Group IRD control is used to selectively "black out" TV events, such as a live championship boxing match, in certain countries for which the programmer does not own the distribution rights. Some encryption systems also require the use of a plastic security card, called a "smart card", which plugs into a slot that is built into the front panel of the IRD. The security card consolidates multiple encryption features into a single, electronic chip which contains a special set of mathematical algorithms, electronic keys which must reside in a decoder's circuitry before signal decoding can take place. Once it is plugged into the IRD, the contents of the smart card is read by the IRD's built-in "conditional access" module. Click on the logo right for more information on signal encryption.Digital IRDs Dozens of digitally compressed satellite TV services are now available in the region, with the promise of many more to come in the years ahead. All of these transmissions are more-or-less compliant with a new MPEG-based digital video broadcasting (DVB) standard that initially was developed in Europe and has since been adopted by numerous satellite TV broadcasters around the world. Unlike analogue satellite TV channels, which usually exist as stand-alone services, digital satellite TV services most often are part of a program package consisting of a group of channels. Through digital compression, multiple TV and audio signals can be combined or "multiplexed" into a unified digital bit stream which shares common encryption, electronic program guide (EPG) and service information components. This multiplex is then transmitted through one or more satellite transponders on an individual satellite. The sharing of common elements between various satellite TV services is what creates a unified digital "bouquet". Some digital bouquets, such as the European Bouquet on AsiaSat 2, are multi- channel free-to-air services, while others, such as Orbit, Showtime Arabia and 1stNet, are encrypted to prevent unauthorized reception. To receive the latter, you'll need a compatible digital IRD, subscription authorization and, in most cases, a smart card before you can receive the available programming. The front panel of most digital IRDs these days either sports a "DVB" logo or the phrase "DVB-compliant." Consumers may understandably assume from this that all DVB-compliant IRDs are somehow interchangeable. This is NOT the case. Just because an IRD is DVB-compliant does not mean that it is capable of receiving each and every DVB-compatible satellite bouquet. The DVB standard does NOT specify any particular conditional access (CA) system; each programmer is therefore free to choose the CA system which best fits its particular needs. There also are other restrictions to the use of one digital IRD to receive multiple digital bouquets sharing the same CA system. These include differences in the transmission rates between bouquets as well as the subtle changes to the MPEG coding structure which each programmer elects to make. Prior to transmission via satellite, the DVB digital bit stream is first converted from binary digits to "symbols", with two bits combining to make each symbol. The symbol rate for a DVB-compliant satellite transmission may vary from just a few million symbols, or Megasymbols (Msym), per second to a rate of 30 Msym/s. The digital IRD must be capable of tuning to the exact symbol rate used for a particular DVB transmission before it can decode the signal. For example, digital IRDs with a tuning range of 15 to 30 Msym/s cannot decode digital DTH signals which are transmitted at lower symbol rates. What's more, every digital DTH bouquet uses forward error correction (FEC) to improve the robustness of their signals. FEC rates of 1/2, 2/3, 3/4, 4/5, 5/6 & 7/8 (original information symbols/FEC corrected symbols) are used by various digital DTH systems around the world. The digital IRD must be capable of either tuning to or automatically selecting the FEC rate used by the service which it is attempting to receive.Click on the logo right for more informationon digital video compression.Digital IRD Features.There are major differences between the features and options offered by analogue IRDs and their digital counterparts. Most digital IRDs are programmed at the factory to receive a single digital DTH bouquet from just one satellite. This initial set-up includes the satellite transponder's center frequency and polarization format, as well as the service provider's symbol and FEC rates. Therefore no provisions are made in the IRD design for switching from one satellite to another, nor is the digital IRD's remote control equipped with buttons for changing satellite transponders or transponder polarization. The good news is that operating a digital IRD is much like operating a regular TV set: flip through the channels, kick back and enjoy. Once installed, the digital IRD will automatically tune to the factory-programmed "default transponder" and access the EPG, Service Information, and CA data which it needs before it can begin delivering signals to your TV set. The Service Information data transmitted over the satellite gives the IRD the location of every satellite TV and audio service in the bouquet. The TV viewer merely has to select the desired video or audio service and the digital IRD does the rest. If for any reason, the location of any digital satellite service in the bouquet ever changes transponders, the Service Information data transmitted over the satellite will automatically notify the IRD. Any changes of this nature are totally transparent to the TV viewer. Digital IRDs also do not have any built-in noise reduction or TI filters for the viewer to adjust. This is due to the major differences between analogue and digital DTH transmissions. Narrowing the bandwidth of an analogue TV transmission trades off some picture quality for an increase in system C/N. With digital, however, we cannot narrow the bandwidth without losing essential components of the incoming signal. The threshold of a digital IRD is also totally different from its analogue counterpart. As the C/N of an analogue TV signal falls below the IRD threshold point, the picture rapidly becomes noisy, but is still visible. With a digital signal, however, you either have a perfect picture, or no picture at all. Crossing over the digital threshold point is therefore like flipping a light switch, its either on or off. One major benefit of digital DTH technology is its ability to deliver an electronic program guide to the IRD. TV viewers can therefore quickly determine what's coming up next on all the satellite services provided in the digital bouquet. Don't toss the paper TV guide to the family dog just yet, however. You'll still need it to find out what's on tomorrow and the days thereafter. Although most digital IRDs have one or more on-screen menus which the operator can access to change the IRD's operating parameters from the original factory settings, this can be a labor intensive process. This can particularly be a problem if you need to switch satellite frequency bands. Although playing with the settings of a digital IRD is now in vogue amongst satellite hobbyists around the globe, few "normal" satellite TV viewers are likely to attempt this very often, if at all. Be sure that the digital IRD that you purchase is fully compatible with the digital bouquet which offers the programming which you and your family are likely to enjoy the most. Hitech china, hitech z1, hitech 9500, ht9500, hitech korea, hitech factory, hitech manufacturer, hitech supplier, hitech software, dreammaker receiver, hitech receiver