The new design provides manufacturers of television sets to receive digital programming must be easy, few people realize that a war from inside the TV is the United States across the country.
Good news is that consumers will not need set-top box can receive digital TV programs, even high-definition television (HDTV).
To comply with these new FCC rules, manufacturers will also face significant design challenges. In particular, the current use of traditional analog TV tuner design must be completely modified.
“Plug and Play” and “Digital Cable Ready”
FCC’s first step is to require all television includes a digital terrestrial receiver. After four years of gradual adoption of, the end of 2007, all TVs 13 inches or more must meet this requirement. The FCC rules also cover can receive television signals and other electronic devices, such as VCR, DVD recorders and PVR so.
Last year, the rule is extended to be used to meet the “Plug and Play” (Plug andPlay) or “Digital Cable Ready” (Digtal Cable Ready-DCR) DTV tuner cable. This means that the manufacturer designed to receive wireless TV must contain the ATSC (Advanced Television Systems Committee) broadcast signals, digital cable programming and traditional analog TV signal tuner.
“Plug and play” requirement under the rules of wireless digital receiver is changing the design of DTV. Zarlink and Thomson recently launched the first compliant tuner module.
However, these FCC rules do not necessarily give consumers a better TV performance will be discussed later.
Wireless digital TV Although the FCC rules is promoting the shift to digital television, there are still some obstacles that lie free digital TV service with all consumers. Great extent, consumers are not aware of the existence of wireless digital television and HDTV services free of charge.
One problem is the nature of digital television. Use the analog broadcast, even though the “snow” or “ghosting”, but a weak signal can still be displayed channel. In contrast, use of digital broadcasting, then there is “accepting the cliff”?? Image or crystal, or a blank nothing. Empty screen, the wireless digital viewers may mistakenly think that there is no channel signal, or television station failure, but in fact only their TV tuner (receiver) can not do it.
Image quality with the TV turned to a perfect digital transmission, has a market can receive digital signals of TV tuners, whether there will be consumers will turn back to it free of television, we will wait and see.
The Web, conduct a quick search, can find a lot of DTV and HDTV enthusiasts discuss what areas in which wireless digital channel forum. Few people realize that most major cities in the U.S. TV stations are sent through the ATSC digital HD service, more than 80% of TV households receiving five or more ATSC channels. Interestingly, satellite providers are not always available to all U.S. cities local HD programming, but the TV stations often provide free HD.
By the manufacturers and government representatives of the ATSC committee established performance criteria to ensure that the digital terrestrial channels can be as reliable as the analog channel reception. Currently, the ATSC receiver performance specifications are known as the “recommended practice” to allow manufacturers choose or do not meet these criteria.
Mandatory requirements and recommendations of such a combination of confused consumers. DTV imported into the United States must comply with FCC rules and to include ATSC digital tuner. However, the actual performance of the tuner, only ATSC (A/74), as guidelines recommend. Owners of low-performance DTV may find that, although many of the local launch of the channel, they can only receive a small amount of channels, or even wireless signals.
Ideally, FCC should be mandatory for manufacturers include a consistent performance of the proposed digital ATSC tuner. At present, digital receiver manufacturers made the work even if reluctantly still meet the FCC rules. If the FCC require new TV must contain the end user will be forced to pay the digital receiver, will play a mandatory effect, so that it works properly. Unfortunately, FCC rarely write the rules of the receiver performance, their focus is usually on the emission characteristics.
Usually follows the ATSC performance of the proposed increase in cost, very few manufacturers will be willing to do so, unless there is increased performance through market means to balance the increase in the price. If consumers buy TV time to support wireless data services are willing to pay more, manufacturers will tend to improve the likely quality of DTV receivers. When the public recognizes only a small amount of input on the antenna can be obtained free of charge include digital HDTV, including services, this may occur.
Digital receiver circuit required for the entire cost of around 25 U.S. dollars (based on function may be more). The circuit will meet the standard ATSC receiver additional cost. Price is very important in a receiver performance is not a mandatory requirement in a competitive market, manufacturers tend to low-cost, low quality of the receiver.
Proposals meet the ATSC receiver If the manufacturer can be the only selling point as a wireless receiver, then no extra cost, the majority of firms would be willing to meet the proposed ATSC receiver performance. Currently, almost all of the analog TV use the “single-conversion” receiver technology, the term describes a radio frequency signal to the television screen in the show through before the conversion. Using single-conversion architecture due to its low cost and good performance.
To meet the stringent FCC DTV standard, must be able to receive broadcast TV, cable and analog signals, this designer has been using double transform structure. Although the dual transformation is generally easier on the designer, and provides consistent standard of performance DTV tuner, but its way than the single-conversion has to be much more expensive.
Single-conversion technologies can enable the receiver to meet all STV tuner specifications, costs increased by only a few cents instead of a few dollars. Zarlink Semiconductor Inc. has developed a breakthrough single-conversion integrated circuit (IC), the chip can be used at the same time meet the demanding standard ATSC receiver recommendations and FCC SABUNG AYAM