![]() ![]() Applications include sports stadiums and large arenas where it is very difficult to know where different earth potentials exist. The hum eliminator can be inserted at points within the installation at which it is observed the jitter performance degrades. Unlike analogue signals, digital signals do not degrade gracefully but are subject to a 'cliff effect' where the transition from acceptable picture to no picture is quite sudden. Ground loops and noise will not immediately introduce impairments in the picture but will worsen jitter in the signal which will compound with cable-attenuation, poor re-clocking, and signal source instabilities, to push the signal into digital errors. Probably the worst environment is the outside broadcast where multiple generators or AC power cables may be in close proximity to the equipment racks or video cables, inducing tens of volts of ripple on the coaxial cable screens. ![]() These effects are often seen where signals are fed from floor to floor within buildings and can be very significant when they are passed from building to building. This can easily lead to induced hum on video signals. In many installations, equipment racks are powered, unavoidably, from different supplies. Hum can appear on video signals because it has been induced in a ground-loop, or introduced because of a real voltage potential difference (p.d.) between the grounds on the transmitting and receiving equipment. ![]() There are two main sources of hum and two types of hum-elimination available from Allen Avionics. Hum is the term for low-frequency noise induced by alternating currents at 50Hz or 60Hz in AC mains power lines. These hum eliminators and isolators may be used to mitigate the errors thus caused. ![]() SDI and HD-SDI signals suffer less from extraneous noise and low-frequency hum problems than do analogue video signals, however, within complex broadcast installations the potential exists for ground-loops and potential differences between grounds. (aktualisiert 28.11.23) Kurze Kabellängen Kategorien Hersteller Neue Produkte Audio- und Daten Steckverbinder Video- und RF Steckverbinder Netzsteckverbinder und Stromverteilung Anschlussfelder, Steckfelder und Stageboxen LWL/Glasfaserkabel, Glasfaser-Stecker und Schnittstellen Konfektionierte Kabel und Patchkabel Kabel Kabelzubehör und Werkzeuge Koffer und Taschen Racks und Rackzubehör Rack accessories and hardware Beleuchtung, Uhren, Studioeinrichtung, Montagezubehör und Stände für Equipment Datenspeicher, Medien, Etikettierung und Geräuscheffekte Mikrofone Drahtlosmikrofone Mikrofonstütze- und Ständer, Mikrofonverstärker, Stromversorgung und Zubehör Kopfhörer, Headsets, Ohrhörer, Verstärker und drahtlose Systeme Gehör-und Geräuschschutz Aufnahme, Wiedergabe, Radioempfänger Audio-Schnittstellen Video-Schnittstellen, Bearbeitung, Monitoring, Kamerazubehör Audio Mischpulte und Bearbeitung Verstärker Lautsprecher und Audio-Monitoring Test und Messgeräte Kommunikationen, Konferenzsysteme und Datenkommunikationen Assistive Listening Index Hersteller Neue Produkte Sonderangebote Abverkaufsliste ![]()
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