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Present, A Lot Of Buses, Taxis, Each To Install A Digital Tv, This Tv Technology Used Is DVB-T
Present, numerous buses, taxis, both to install a digital Television, this television technology employed is DVB-T (Digital Video Broadcasting - Terrestrial). DVB-T power comparison, it really is not appropriate for battery-powered mobile devices to utilize. To this finish, the DVB-T according to the introduction of new technologies, form appropriate for mobile terminals to obtain terrestrial digital Television transmission standard DVB-H (digital video broadcasting - handheld). Compared with DVB-T, DVB-H terminals with lower power consumption, mobile reception, and anti-jamming efficiency is superior.
DVB-H regular is according to DVB and DVB-T regular on two criteria. A DVB-H system receiver front-end is actually a DVB-H wrapper and DVB-H modulator, DVB-H package is responsible for the IP data encapsulation into MPEG-2 Systems Transport Stream (TS), DVB-H modulator for the channel coding and modulation; program terminal by the DVB-H DVB-H demodulator and terminal form, DVB-H demodulator for channel demodulation, decoding, DVB-H terminal is responsible for operations related to processing, display.
Important technologies In DVB-H, the data link layer making use of the time slicing technologies is the 1 bright spot, it's utilized to decrease typical power consumption of handheld devices to facilitate a smooth and seamless company exchange. Multi-protocol encapsulation (MPE) FEC technologies to enhance signal to noise ratio of mobile use (S / N) threshold and Doppler performance, but also can improve the anti-pulse interference.
Time Segmentation, by definition, Time Division Multiplexing technologies. It solved the problem handheld mobile digital Tv receiver within the high power consumption. Because of this of burst mode transmission of data, every single burst transmission time slice of a business, delivery time inside the business of the company single-chip holds all of the data bandwidth, and that the next time slice generated by exactly the same business time. For the receiver, the only time specified in the packet can receive data. In this way, hand-held terminal may be selected to receive the specified time enterprise, cost-free time to complete energy conservation in business processing, thereby decreasing the overall average power consumption. Of course, this period may be the front-end transmitter has been operating within the very same enterprise is going to be sent between the two time slots of other business information, DVB-H signal may be the time slice by the number of such composition. From the receiver's point of view, the operational information received isn't a constant rate as the standard continuous mode, the information arrival interval discrete way, to achieve burst transfer. If the decoding terminal requests a lower information rate, but must be a constant rate, the receiver can initial of all of the received burst information to the buffer, and then create the information flow rate unchanged. Burst bandwidth is normally fixed at about ten occasions the bandwidth. Twice the bandwidth at a fixed bandwidth of sudden case of power could save 50%, ten times the bandwidth, so in case you can save 90%. In addition to lowering power consumption, the time slicing technologies is also useful to various networks to achieve a smooth data exchange. In the information transmission idle time, the adjacent cellular mobile terminal can monitor, scanning other frequency signals, test signal strength, this way when the user enters a brand new network, the mobile terminal to monitor the results based on the idle time inside the signal to switch to a different transport stream on distinct networks to attain a smooth data exchange.
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DVB-H normal in the information link layer for the IP datagram added Reed? Solomon (RS) error correction coding, as MPE forward error correction coding, verification of details in the specified FEC ( FEC) section of the transmission, that is multi-protocol Encapsulation - Forward Error Correction (MPE-FEC). MPE-FEC goal is to increase the mobile channel in S / N, pulse Doppler and resistance to interference.
Proved even in quite poor reception environment, the suitable use of MPE-FEC can still be accurate reconstruction of the IP data. MPE-FEC data overhead allocation is extremely flexible, in other transmission parameters unchanged, if the checksum overhead to 25%, the MPE-FEC enables handheld devices to and use of antenna diversity reception when the same S / N. DVB-H IP-based data broadcast, DVB-H physical layer according to the DVB-T supplement. Inside the DVB-T method, 2K mode 8K mode far better than the mobile reception efficiency, but the 2K mode symbol period and guard interval is very short, so 2K mode only for tiny single frequency networks. DVB-H 4K mode increases having a longer period and symbol guard interval, to the construction of medium-sized single-frequency network, better network optimization, spectrum efficiency. This optimization is not as effective 8K mode, but the 4K mode 8K mode symbol period than the short, a lot more frequent channel estimation, supplies a greater mobile efficiency than the 8K. Consequently, 4K mode and performs between 2K and 8K modes, for coverage, spectral efficiency and mobile reception performance of the trade-off to provide an further choice. 2K and 4K mode in-depth symbol interleaver, can further increase the environment and also the impact of noise in the mobile environment, the method reliability. By means of the coordination of mobile reception performance along with the scale of a single frequency network to further enhance network design flexibility.
Receiver design
Now numerous companies devoted to portable terminals DVB-H receiver module design. Here, I described the reception module is Freescale's MC44CD02 direct conversion tuner and DiBcom's DiB7000-H channel decoder. Use of this tuner, users can in a variety of harsh conditions are DVB-H services.
Have we missed the Point (How much does it cost for a new customer)
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Spec'ed a PC, how much to build it?
How much would this cost to build?
-Core 2 Duo 2.66GHz (1333MHz FSB)
-500 GB HDD (S-ATA)
-2GB of RAM (667Mhz)
-Blu Ray AND HD DVD Drive
-8 Channel Surround sound
-GeForce 256mb GS
-Tv Tuner (DVB-T, DVB-S, Analogue TV)
-Vista Home Primium
-Keyboard + Mouse
-Wireless LAN + Ethernet port
-Case
-Suitable PSU
@ Eddie J , I already have XP Professional and another hard drive so my machine can boot up either operating system.
I'll build it for a 100 bucks, you buy the parts.
GPS + TV DIGITAL (TUNER DVB-T MPEG 2) COMPLETAT.mpg
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