Ingeniería, investigación y tecnología
versão impressa ISSN 1405-7743
MOUMTADI, F.; DELGADO-HERNANDEZ, J.C. e RODRIGUEZ-HUERTA, J.. Transmission Interferences Level Measurement for Digital Audiobroadcasting Signals Transmitted on Hybrid Mode. Ing. invest. y tecnol. [online]. 2012, vol.13, n.1, pp.113-125. ISSN 1405-7743.
One of the most important strategies developed to boost the commercial introduction of new digital radiobroadcast standards is based on the use of the present AM transmission infrastructure to send both analog and digital signals over the same medium and range of frequencies through a suitable scheme of modulation. This mode of transmission is denominated "hybrid mode", and is based on the use of the keeper range of frequencies between carriers of analogical transmission to send the digital signals. However, radiobroadcast over adjacent frequencies with minimal guard intervals between them could generate interference on the digital information under certain circumstances. In this work the transmission of both In Band - On Channel (AM IBOC) and Digital Radio Mondiale (DRM) digital standards, broadcasting in hybrid mode from adjacent frequencies is analyzed through the use of models, and the implications of the phenomenon and its possible solutions are concluded, taking as example the case of three commercial stations nowadays operating in Mexico City.
Palavras-chave : digital signals; DRM; IBOC; hybrid mode of transmission.