Return channel for the Brazilian digital television system-terrestrial

Abstract

Recently, it has been proposed the use of

Bringing All Users to the Television: A Platform Based on Java for Building Interactive Television Applications

“…This work focuses on the environment Ginga-J, especially in regard to the specification JavaDTV (JavaDTV, 2010), having the following basic assumptions: a) your TV as access terminal (screen) to the basic interactive applications, b) the remote control as main device (remote device) to the viewer/user interaction, c) the automatic identification of the characteristics of the access terminal (memory, disk and network interfaces) available for operating of the back channel (interactivity channel) (Meloni, 2007).…”

“…These structures are received and presented at the access terminal of the viewer/user. The last stage is focused on the interaction of the viewer/user with resident applications without using the back channel; the interaction is completed using the back channel via any communication infrastructure (Meloni, 2007).…”

“…Unlike what happens in other countries, where the back channel can be established using existing cable networks, in Brazil the situation is more complex (Meloni, 2007;Carvalho et al, 2007). Remote communities in the interior of a huge country like Brazil cannot attract operators of fixed or mobile telephony because of the high cost of installation and maintenance of equipment in comparison with the lack of prospect of back on investment in these regions.…”

Planar monopole antennas for digital TV, design, and measurement

“…After a period of comparisons and evaluations of different digital TV systems (namely the North American ATSC, the Japanese ISDB, and the European DVB), Brazil has decided upon its own system, named SBTVD‐D, an offshoot of the Japanese system . The main characteristics that favored the choice of the Japanese system were its mobility and flexibility, especially, the capacity of mobile reception of image and data .…”

CollaboraTVware: uma infra-estrutura ciente de contexto para suporte a participação colaborativa no cenário da TV Digital Interativa.

“…• Radiofreqüência (Wi-Fi, WiMAX etc) -é possível, por exemplo, usar a própria largura de banda do meio de difusão (via antena de recepção) para enviar dados no sentido inverso. E no caso do WiMAX (radiofreqüência intrabanda), Meloni (2007) apresenta algumas vantagens que justifica o interesse por esta tecnologia: melhor alcance do sinal (até 65Km) e oferecer canal de retorno a áreas com baixa densidade demográfica com apenas uma estação base são algumas delas.…”