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Switching Systems
Published in Tim Kuschel, The Live Event Video Technician, 2023
Another aspect to system engineering is knowing the limits of your signal cables. An HDMI cable with a 1080p signal can go about 50 feet. Likewise, a DisplayPort cable is rated for a maximum distance of 25 feet. Cable distance is directly proportional to the data rate and bandwidth of the signal. To put it simply, the more pixels you’re trying to transport from one place to the other, the shorter the usable cable distance. A HD-SDI cable rated for 3 GHz can send a 1080p signal up to 250 feet. That same cable with a smaller bandwidth 720p signal can go 500 to 600 feet.
Digital Audio and Video
Published in Skip Pizzi, Graham A. Jones, A Broadcast Engineering Tutorial for Non-Engineers, 2014
The HD-SDI or SDI format carries the stream of digital bits representing the luminance and chrominance samples for the video. The analog sync pulses are not digitized, so special codes are added showing the start of active video (SAV) and end of active video (EAV). The luminance and chrominance data is combined together, and finally the stream of digital bits is sent sequentially down the cable. HD-SDI and SDI are similar in the way they work; the main difference is the much higher bit rate needed for HD-SDI.
Video Basics
Published in Wes Simpson, Video Over IP, 2013
Digital audio signals can also be embedded into digital video signals, such as SDI and HD-SDI. Audio is embedded into an SDI stream in the portions of the stream that are reserved for ancillary data. At the receiver, these bits can be copied out of the video stream and supplied as a digital audio signal. Audio embedding and extraction can be done without any degradation of either the audio or the video signal, because all of the processing is done digitally.
Automation and redistribution of work: the impact of social distancing on live TV production
Published in Human–Computer Interaction, 2023
Pavel Okopnyi, Frode Guribye, Valentina Caruso, Oskar Juhlin
The problem of limited resources, such as fewer incoming video sources (e.g., Skype calls) is addressed by the shift in technologies that continues to happen during the pandemic. In particular, there has been a shift from hardware-restricted to software-based protocols, as I04 elaborated: This is where we are going, and then we can talk about the NDI and the future. I don’t know if it [the future] is the NDI, but it’s not SDI [serial digital interface] anymore. SDI, I think, will just disappear very slowly. We still have some years with this SDI because the whole world is using SDI. It’s not [going to change] in one day.