Exploring the Effects of Directional Antenna Pattern Bandwidth on MA3 Transmissions - $15
Date: April 23, 2022Topics: 2022 BEITC Proceedings, AM and FM HD RadioThis paper examines the real-world impacts of an AM directional antenna pattern (specifically, WWFD’s nighttime pattern) on the quality of its MA3 transmissions.
David Kolesar | Hubbard Radio | Washington, District of Columbia, United States
Mike Raide | Xperi Corporation | Columbia, Maryland, United States
Field test of ATSC 3.0/BPS precise time distribution - $15
Date: March 21, 2025Topics: 2025 BEITC Proceedings, Broadcast Positioning System (BPS): Resilience and PrecisionThe Broadcast Positioning System (BPS™) is a protocol for high-resolution time transfer between a reference clock at a ATSC 3.0 transmitter and a BPS receiver’s disciplined-clock output. Time transfer is a prerequisite for (and useful by-product of) positioning/navigation systems such as Global Navigation Satellite Systems (GNSS); for example, the Global Positioning System (GPS). In principle, BPS may address potential vulnerabilities in critical applications with GNSS dependence, mostly due to relatively weak GNSS signal levels at Earth’s surface. In 2024, BPS was added to the ATSC 3.0 transmission of the station KWGN in the Denver, Colorado metropolitan area. To measure BPS time transfer stability, BPS receivers were installed at two NIST campuses (the furthest: 106 km away) and compared against independent local atomic clock timescales. As an example, over one 50-day period and a non-line-of-sight (NLOS) transmission path of 30 km that includes terrain obstruction, we observed peak-to-peak time deviations on the order of tens of nanoseconds (including all variation of the reference time scales), a stability roughly comparable with ubiquitously deployed, single-band GPS receivers.
Jeff A. Sherman, David A. Howe | Time and Frequency Division, National Institute of Standards and Technology | Boulder, Colo., United States
Fighting Misinformation with Authenticated C2PA Provenance Metadata - $15
Date: April 14, 2023Topics: 2023 BEITC Proceedings, Cybersecurity and Trusted ContentOver the last three years, teams from Microsoft, The New York Times, CBC/Radio-Canada and The BBC have come together as Project Origin. This group has participated as part of a wider community in the standardization of provenance signaling technologies to attach authenticated metadata to media content. The Coalition for Content Provenance and Authenticity (C2PA) specification was the result of these collaborative efforts. This paper will outline the features of the C2PA specification, and the work being undertaken to add this functionality to existing media production workflows to add transparency and counter disinformation and malicious use of synthetic media.
Nigel Earnshaw | The British Broadcasting Corporation | London, United Kingdom
Jonathan Dupras | CBC/Radio-Canada | Montreal, Quebec, Canada
Bruce MacCormack | Neural Transform | Lunenburg, Nova Scotia, Canada
Filling the Gaps in Video Transcoder Deployment in the Cloud - $15
Date: April 14, 2023Topics: 2023 BEITC Proceedings, Media and Cloud 2Cloud based deployment of content production and broadcast workflows has continued to disrupt the industry after the pandemic. The key tools required for unlocking cloud workflows, e.g., transcoding, metadata parsing, streaming playback, are increasingly commoditized. However, as video traffic continues to increase there is a need to consider tools which offer opportunities for further bitrate/quality gains as well as those which facilitate cloud deployment. In this paper we consider pre-processing, rate/distortion optimization and cloud cost prediction tools which are only just emerging from the research community. These tools are posed as part of the per-clip optimization approach to transcoding which has been adopted by the large streaming media processing entities but has yet to be made more widely available for the industry.
Vibhoothi | Sigmedia Group, Department of Electrical Engineering, Trinity College Dublin | Dublin 02, Ireland
Daniel Joseph Ringis | Sigmedia Group, Department of Electrical Engineering, Trinity College Dublin | Dublin 02, Ireland
Xin Shu | Sigmedia Group, Department of Electrical Engineering, Trinity College Dublin | Dublin 02, Ireland
François Pitié | Sigmedia Group, Department of Electrical Engineering, Trinity College Dublin | Dublin 02, Ireland
Zsolt Lorincz | Overcast HQ | Dublin 02, Ireland
Philippe Brodeur | Overcast HQ | Dublin 02, Ireland
Anil Kokaram | Sigmedia Group, Department of Electrical Engineering, Trinity College Dublin | Dublin 02, Ireland
FM 8th Harmonic Interference to a Cellular Service Not Caused by an FM Station: A Case Study - $15
Date: April 26, 2020Topics: 2020 BEITC Proceedings, New Spectrum IssuesIt is well-known?that 7th and 8th harmonic FM broadcast emissions have been a source of contention between cellular carriers and FM stations. Such harmonics are rarely radiated from the broadcast antenna itself. Usually, the cabinet radiation of the FM transmitter is seen as the culprit, even if the cabinet radiation is within the Part 15 specifications. In a special case, the proximity of the FM and cellular antennas can create?an overload situation where the cellular carrier generates?its own interference. A station in Massachusetts was accused of causing 8th harmonic interference and the carrier involved the FCC in the matter. A methodical approach had to be taken to eliminate the assumed causes of the interference and implicate the carrier’s internal receiver overload mechanism as the cause. This paper is a case study of that complaint.?It shows how the possible causes had to?be unpacked to satisfy the complainant and the FCC that the FM station was not the primary cause. The various mechanisms for generating 8th harmonic energy are explored. The?calculations and measurements required to exonerate the FM station are presented.?
David Maxson | Isotrope, LLC | Medfield, Massachusetts, USA
