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4ASI / DVB-T Scrambling Converter
Multifunctional transcriber of the television programs of those isolated of 4 digital transport flows (ASI) in the signal of digital ether television with the possibility of work in the system of conditional access.
Designation.
Isolation from the digital flows, accepted from 4 satellite tuners or other sources of those having ASI outputs, necessary television programs. A quantity and the quality of the programs adopted is selected by operator itself in the limits of the general flow, passed by converter with the aid of the forming part delivery of the specialized program - by analyzer of digital flows. Output of converter - signal of size DVB-T The use of a device makes it possible to obtain all technical advantages of the digital television:
o An increase in the quantity of channels
o The expansion of the zone of coating
o The reliable system of address coding not contributing defects in the process of coding decoding.
o The high quality of received signal
o Stereo sound.
The operational capabilities: The spectrum of the output signal of 8MGts. method is conducted on the standard digital receiver DVB- T. the indication of the presence of digital signal separately for each entrance ASI. Indication of exceeding the digital flow of the maximum permissible value. Control of the operating modes from the computer according to interface RS485 operating principle: The digital signals of standard ASI will be given to 4 entrances of device. From the incoming 4 digital flows are separated indicated by operator the television channels, which it is multiplexed into the united digital flow, which, in turn is converted in accordance with standard DVB-T and modulates the output signal of device at the frequency of 36 MHz. System of the conditional access: The system of the conditional access DVCrypt is based on CSA (Common Scrambling Algoritm) the algorithm, developed ETSI and approved DVB by consortium. This algorithm ensures the transmission of video and audio information in size MPEG2 in the form protected from the unsanctioned access. The method OF TV programs of those protected by system DVCrypt is possible only on the digital receivers of size DVB-C, equipped with the modules of conditional access, also, with the inserted card of the conditional access.
Brief technical parameters:
o Input signals 4 TS Mpeg-2 ASI
o form modulation COFDM
o A quantity of sub carriers 2k
o The form of modulation of sub carriers 64 QAM
o code speed ѕ either 5/6
o shielding interval of 1/4 or 1/8
o Band of frequencies DVBT of the signal of 8mGts
o The maximum flow of data is input ASI 2ya.22"m.B/sek
o The total flux of given at entrance DVBT of modulator 24.88 MB/s
o The level of the output signal of 20dBmVt+/-3dB
o The frequency of output signal 36 MHz
o The port of connection with PK rs-485
o Joints on output F.
o On entrance BNC
o The nourishment of 220V ± 20%
o The required power
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