Home
Contact Us
Can't you choose the video glasses you need?
Contact Us
!
Vizix Video Glasses
As summary of the different concepts explained in the Vizix Video Glasses preceding chapters, andasanintroduction as ofanintegrated the receiver decoder (IRD or frequent attitude top side box), we briefly and inside simple expressions will repeat description the different processing steps, which the television signal has too from the source to the announcement on the screen of the final user to follow. The top of the table 8.1 (similarly Fig. 2.6) steps on the gearbox side, its illustrate to supply must multiplex programs MPEG-2 over a Rf-channel: 1. Video and acoustic signals of the programs, to transmission to be are everyone passed through a coder MPEG-2, that the video supplies and AudioPESs to the programs of the multiple coupler (approximately four to eight per Rf-channel dependent on the parameters selected for coding). 2. This PESs are used by the multiple coupler to form around a 188-Byte-Transport packages, which are finally crept (CAT puts a carrying conditioned access information ECM/EMM used in this case), as well as the FLIP, PMT, P-/inund DVB SItabellen for the electronic program leader (EPG). The package length increases R-S error correction to 204 bytes; in case of the satellite the thread coding continues to multiply bit Vizix Video Glasses rates by a factor of between 1.14 (Rc =7/8) and 2 (Rc = 1/2); Formatting the data (illustrating symbol) followed by screening and the D/A produce transformation i-and the q-correspondence of signals. 4. I-and the q-signals modulate hoisting engine (intermediate frequency of the order of 70 MHz) in QPSK (Satelitte) and in QAM (cable) or COFDM (terrestrial) IF. 5. This, IF into the suitable frequency band one above-converts (dependent on the means) for transmissions to the final users. In case of the satellite the frequency change gets it to necessary value for to the satellite transponder, in that it uplink is you again the frequency, those inside for diffusion into the final users is converted the KU volume (from 10.7 to 12,75 gigahertz). Direct diffusion by cables is relatively rarely in Europe and most of sets you time of process along-includes a satellite and a head station firmly, places QPSK demodulation/QAM remodulation and conversion reliably on the suitable VHF or UHF channel. The unterere part of table 8.1 shows the supplementing steps which on the receiver side takes place; these are actually the back of those on the gearbox side. 6. In case of the satellite a Anfangsc$untenumwandlung in the antenna head (low-noise converter, LNC) takes place, gets the frequency into the distance 950-2150MHz (entrance of the IRD), where it goes through a second Untenumwandlung (after Rf-channel allotter) to an intermediate frequency, those normally is 480 MHz. For cables and terrestrial, it only downconversion from VHF/CUHF a channel gives too IF from 36.15MHz in Europe. 7. The coherent demodulation of this, IF the I and the Q supply analog signals. 8. After A-/Dumwandlung filtering and reformatted of I and of Q (demapping symbol), the forward error correction wins back transportation packages of 188 bytes. 9. The Demultiplexer preselects the PES, that the program corresponds selected by the user, that before to have been can crept assistance of the electrical tax module, EMM and the user key (smart card). 10. The decoder MPEG-2 builds the video and the audio of desired program. 8,2 structure of the integrated receiver decoder (IRD) we saw photograph processes, which indicate the bases of the IRD to architecture over the main steps in the digital television transmission and. We enter now into little further details outside however, for the level of the electrical diagrams down go, since this little would offer, because of their very large complexity. Actually without even considering the costs such of an enterprise, is it practically Vizix Video Glasses out.
Brands
heregoesmyvu
Copyright © , TheVideoGlasses.com. All rights reserved.
Copyright ® TheVideoGlasses.com All rights reserved.
1
2
3
4
propecia
Vizix Video Glasses
