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Tri N.T.,Audio Visual Global | Thang N.C.,Audio Visual Global JSC | Tung H.T.,Audio Visual Global JSC
ABU Technical Review | Year: 2012

Audio Visual Global JSC., (AVG Vietnam) has deployed a digital terrestrial television (DTT) broadcasting network using the second-generation digital terrestrial television (DVB-T2) standard for SFN technology, which saves frequency resource. To set up and adjust the synchronization between the transmitters in SFN network, AVG used T2 Gateway blocks, GPS receiver to transmit the synchronous signal to transmitters through lpps and 10 MHz signal from the satellite. The system comprises Programme source, T2 Gateway, Transmission network, and Transmitter sites. The Headend center functions to compress programs, using MPEG4 encoder devices, applying Control Access (CA) system and subscriber management, and program channels multiplexers (MUX). AVG's successful implementation of digital terrestrial transmission and broadcasting infrastructure has created new opportunities for providing high definition television (HDTV) services, mobile TV services and other services in the future.

Tri N.T.,Audio Visual Global JSC | Thang N.C.,Audio Visual Global JSC | Duc N.M.,Audio Visual Global JSC
ABU Technical Review | Year: 2013

A single frequency network (SFN) is a special broadcasting network where several transmitters radiate the same signal on the same frequency, at the same time. SFN with the DVB-T2 standard provides an effective solution to save frequency resources. On the other hand, because of using the same. The interfered areas are difference sizes, since the transmitting powers and the height of the transmitting antennas of two sites are different. Based on simulation results, AVG measured on field at the area where interferences might occur. In SFN there are always transmitters which have distance between them bigger than the allowed maximum, SO there is therefore always risk of SFN interference. However the simulation results and AVG's deployment in DVB-T2 SFN show that the risk of SFN interference can always be predicted and controlled by adjusting transmitter power, tilt and direction of the receiving and/or transmitting antenna.

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