Oleg V. Varlamov,
Institute of Radio and Information Systems (IRIS), Vienna, Austria
SYNCHROINFO JOURNAL. Volume 8, Number 4 (2022). P. 2-8.
The Digital Radio Mondiale (DRM) digital broadcasting system is the only ITU-approved digital broadcasting system for the LF, MF and HF bands. Numerous theoretical and field studies, as well as operating experience over the past 20 years, have allowed a good study of digital broadcasting networks organization according to this standard. However, some of the issues related to the audio path formal characteristics were not considered. The article discusses the audio coders used in the DRM system and the available data rates in various immunity modes. A set of test signals for instrumental measurements and listening has been developed. The results of experimental measurements for various data rates are presented. It is shown that the range of modulating frequencies in 7 modes of immunity is not narrower than for FM transmitters. In another 5 modes of noise immunity, the range of modulating frequencies is narrower than for FM transmitters, but wider than for AM transmitters. It is confirmed that at data rates of more than 16.5 kbps, the DRM transmitter signal quality becomes no worse than AM signal transmitter quality. Above 24 kbps, the DRM transmitter signal quality becomes comparable to that of an FM transmitter.
Keywords: digital broadcasting, DRM, transmitter, sound quality, instrumental measurements.
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 O.V. Varlamov, “Development of requirements for receiving equipment of digital broadcasting networks of the DRM standard”, T-Comm, vol. 7, no. 9, pp. 39-42, 2013.
 O.V. Varlamov, V.G. Lavrushenkov “The quality criteria for the DRM standard transmitting device and the measuring equipment,” Broadcasting. Television and radio broadcasting. No. 3. Pp. 44-48, 2004.
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 N. Gromorushkin, O. V. Varlamov, A. V. Dolgopyatova and A. A. Voronkov, “Operation Problems of the EER Transmitter with Narrowband Antenna,” 2019 Systems of Signals Generating and Processing in the Field of on Board Communications, Moscow, Russia, 2019, pp. 1-5. DOI: 10.1109/SOSG.2019.8706736
 O. V. Varlamov, D. C. Nguyen and S. E. Grychkin, “Simultaneous Application of Several Synthetic Methods for High Efficiency Radiofrequency Amplification,” 2021 Systems of Signals Generating and Processing in the Field of on Board Communications, 2021, pp. 1-5, doi: 10.1109/IEEECONF51389.2021.9416126.
 Varlamov O.V., Nguyen D.C., Grychkin S.E., “Combination of synthetic high-performance RF amplification techniques,” T-Comm, vol. 15, no.9, pр. 11-16, 2021. DOI: 10.36724/2072-8735-2021-15-9-11-16
 O. V. Varlamov, “Multiphase PWM characteristics in the EER transmitter envelope path,” 2021 International Conference on Engineering Management of Communication and Technology (EMCTECH), 2021, pp. 1-5, doi: 10.1109/EMCTECH53459.2021.9619166.
 O.V. Varlamov, V.N. Gromorushkin, V.G. Lavrushenkov and I.V. Chugunov, “Generator of test signals for measuring characteristics of EER SSB switching power amplifiers,” T-Comm, vol. 5, no. 9, pp. 47-49, 2011.
 O. V. Varlamov and E. P. Stroganova, “Frequency extension circuit for EER transmitters operating with electrically short antennas,” 2018 Systems of Signals Generating and Processing in the Field of on Board Communications, Moscow, 2018, pp. 1-5. DOI: 10.1109/SOSG.2018.8350577
 O.V. Varlamov, “Using the extraordinary wave for digital DRM NVIS broadcasting,” T-Comm, vol. 9, no. 1, pp. 32-38, 2015.
 O.V. Varlamov, “Study of DRM digital broadcasting in the MF fading zone,” T-Comm, vol. 9, no. 2, pp. 41-45, 2015.
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 O.V. Varlamov, “The technology of creating a digital broadcasting network of the DRM standard for the Russian Federation”, D.Sc. Thesis, Moscow, MTUCI, 2017.
 O. Varlamov, V. Varlamov and A. Dolgopyatova, “Digital Radio Broadcasting Network in the Arctic Region,” 2019 24th Conference of Open Innovations Association (FRUCT), Moscow, Russia, 2019, pp. 457-462. DOI: 10.23919/FRUCT.2019.8711933
 Varlamov O.V., Varlamov V.O., Dolgopyatova A.V., “DRM broadcasting international network to create an information field in the Arctic region,” T-Comm, vol. 13, no.9, pр. 9-16, 2019.
 O. V. Varlamov and A. A. Bychkova, “Basis of Technical Design and Development a Single-Frequency DRM Digital Broadcasting Network for Venezuela,” 2021 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO, 2021, pp. 1-7, doi: 10.1109/SYNCHROINFO51390.2021.9488396.
 O. V. Varlamov and Abi Assali Bychkova, “Development of a DRM standard digital simultaneous radio broadcasting network for Venezuela,” REDS: Telecommunication devices and systems. Vol. 10. No. 2, pp. 23-27, 2020.
 O.V. Varlamov, “Analog to digital signal power ratio in simulcast DRM transmission,” T-Comm, vol. 10, no. 12, pp. 81-84, 2016.
 O. V. Varlamov, “Organization of single frequency DRM digital radio broadcasting networks. Features and results of practical tests,” 2018 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), Minsk, 2018, pp. 1-8. DOI: 10.1109/SYNCHROINFO.2018.8456925
 Varlamov O.V., “Organization of single frequency DRM digital radio broadcasting networks. Features and results of practical tests,” T-Comm, vol. 12, no.11, pр. 4-20, 2018.
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 Report ITU-R BS.2144, “Planning parameters and coverage for Digital Radio Mondiale (DRM) broadcasting at frequencies below 30 MHz,” 2009.