Broadcast Engineering

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Barnfind’s high-speed data router and optical CWDM for TV infrastructure

Root6’s SI dept spent a few days last week in Norway as the guest of Barnfind in Sandefjord. Norway seems to be a lovely country if not a tad expensive (£24 for a round of three pints).  Barnfind are a small company whose engineers used to be with Nevion – you’ve probably come across their [...]

By |2017-01-12T10:42:15+00:00August 27th, 2014|Categories: Broadcast Engineering, Products|Tags: , , , , |1 Comment

Tech Breakfast – "Cat8 is Coming" & "The Challenges of Modern Picture Quality Analysis"

8:30 for 9am, Wed 1st Oct, Soho Screening Rooms root6′s Broadcast Engineering gurus, Phil Crawley and Matt Ward, explore some of the hot topics of the moment. Matt takes a look at the new Cat 8 standard whilst Phil discusses the challenges of modern picture quality analysis and demonstrates the TG-100 SRI Visualiser, which can [...]

By |2016-10-29T08:54:58+00:00August 20th, 2014|Categories: Broadcast Engineering, Events, News|Tags: , , , , , |0 Comments

MPEG transport stream corruption; effect on pictures

I've been running training at the MET's video forensics lab soon and part of it is explaining how DCT-based compression works and particularly the effects of corruption on long-GOP MPEG transport streams as delivered in DVB-MUXes. One of the illustration videos is below. Three clips; each with a momentary corruption to the data stream and [...]

By |2015-02-23T16:22:43+00:00August 16th, 2014|Categories: Broadcast Engineering|0 Comments

Measuring fibre cabling and the problem of encircled flux loss

  Last week I went on a very interesting training day courtesy of Nexans – data cable & parts supplier. I went looking forward to learning all about the new standards surrounding catagory-8 cabling for 40 and 56 Gigabit ethernet (a massive 1600Mhz of bandwidth down a twisted pair cable!) and the new GG45 connector; [...]

By |2016-10-29T08:55:00+00:00July 21st, 2014|Categories: Broadcast Engineering, tips|Tags: , , |0 Comments

The challenges of modern picture quality analysis

Engineers have sought to quantify the quality of the video signal since the birth of television. Since all aspects of the TV picture are represented first by voltages (analogue) and then by numbers-in-a-bit-stream (digital) you have to make measurements to really know anything about the quality of your TV pictures. “When you can measure what [...]

By |2016-10-29T08:55:00+00:00July 16th, 2014|Categories: Broadcast Engineering, Products|Tags: , , , , , , |0 Comments

"Ask Us Anything" – 004

In the fourth of our “Ask Us Anything” discussions/podcasts , Phil, Rupert and Dave are joined by Rhys Llewellyn from NBC Universal to discuss mains safety, fibre optic standards and our recent Platform1 event. Please contact us with any questions or topics you’d like us to discuss or take part in the discussions yourself. Get [...]

By |2016-10-29T08:55:01+00:00June 13th, 2014|Categories: Broadcast Engineering, Opinion, Podcasts|Tags: , , , , , , |0 Comments

"Ask Us Anything" – 003

In the third of our new “Ask Us Anything” discussions/podcasts , we discuss Sony OLEDs, Cat8 cabling, PSE and the DPP plus Sony Disk Archive storage. Please contact us with any questions or topics you’d like us to discuss or take part in the discussions yourself. Get in touch for an invite to the next [...]

By |2016-10-29T08:55:02+00:00May 23rd, 2014|Categories: Broadcast Engineering, Opinion, Podcasts|Tags: , , , , , , , , , |0 Comments

Antrica video-over-IP encoder/decoders

Every TV industry magazine is currently honor-bound to run a “video-over-IP will replace baseband this year” article at least once every three months. Despite the attraction of sending video over networks there are fundamental problems related not to the fact that it’s a network (but, then again TCP/IP was never meant for synchronous, timely delivery [...]

By |2016-10-29T08:55:04+00:00May 13th, 2014|Categories: Broadcast Engineering, Products|Tags: , |1 Comment

"Ask Us Anything" – 002

In the second of our new "Ask Us Anything" discussions/podcasts , we discuss Television colourimetry, Klein KT10-A colour probe, EDID (and Avid!), Avid ISIS, nearline storage and Protools Please contact us with any questions or topics you'd like us to discuss or take part in the discussions yourself. Get in touch for an invite to [...]

Colour results from a Sony PVM-2541 TriMaster OLED monitor

Having spent a bit more time with the Klein KT10-A probe I profiled the Sony monitor we hired to practice on. Here you can see the colour gamut for the displayed compared to the Rec709 colour space for television. I used the Klein “K Colorimeter” Windows software to make these measurements. Their ChromaSurf software, which [...]

By |2016-10-29T08:55:04+00:00May 6th, 2014|Categories: Broadcast Engineering|Tags: , |0 Comments

Klein KT10-A photometer for TV colour cablibration

We had a splendid day at the Root6 workshop getting to grips with our new Klein KT10-A photometer and testing it out on a couple of Sony broadcast monitors; an LMD-series LCD and a PVM-series OLED. For many years we’ve been relying on the PM5639 colour probe – originally made by Phillips and now badged [...]

By |2016-10-29T08:55:10+00:00May 2nd, 2014|Categories: Broadcast Engineering|Tags: , , |0 Comments

"Ask Us Anything" – 001

Welcome to the first of our new "Ask Us Anything" discussions/podcasts in which we discuss Audio loudness, NAB, 4K & UHD TV as well as the re-birth of telecines! Please contact us with any questions or topics you'd like us to discuss or take part in the discussions yourself. Get in touch for an invite [...]

By |2016-10-29T08:55:10+00:00April 18th, 2014|Categories: Broadcast Engineering, Opinion, Podcasts|Tags: , , , , , , |1 Comment

Loudness – Part 2

Continued from Loudness – Part 1 So what exactly do I need to worry about? According to the EBU R-128 document your program must meet the following: Program Loudness (LUFs), Loudness Range (LU) and Maximum True Peak Level (dBTP) must be used to characterise the audio in your program (i.e. included on your record report [...]

By |2016-10-29T08:55:10+00:00April 15th, 2014|Categories: Broadcast Engineering|Tags: , , , , , , |0 Comments

Loudness – Part 1

What is all this fuss about loudness? In broadcast and audio for video environments, we have traditionally metered audio based on the peak (or quasi-peak [1]) signal amplitude (or maximum sample values in the case of digital). This was great for making sure transmitters or analogue to digital converters were not over-modulated, but [...]

By |2016-10-29T08:55:11+00:00April 15th, 2014|Categories: Broadcast Engineering|Tags: , , , , |1 Comment

Bryant’s network control/measuring PDUs

http://www.bryant-unlimited.co.uk/eyepower.html My good pal Simon Quill at Bryant has been developing this line of intelligent bay mains distribution for the last few years and I bought a couple last year and have (due to the weight of work) only just got around to playing with them. Quite a lot of manufacturers offer remotely controllable power [...]

By |2016-10-29T08:55:11+00:00April 10th, 2014|Categories: Broadcast Engineering, Products|Tags: , , |0 Comments

Blackmagic VideoHub software and QLogic fibre cards under MS Windows in SANs

Here's something from the dim recesses of my brain that I'd just remembered. Blackmagic VideoHub routers take all their network traffic over port 9990; which is also used in some QLogic/SAN configurations for metadata traffic. They don't play nice with each other. To fix this set the BM Software (whilst USB-connected to the hub) to [...]

By |2016-10-29T08:55:11+00:00April 10th, 2014|Categories: Broadcast Engineering, Support, tips|Tags: , , |0 Comments

Miranda, Grass Valley and good-old GPI tallies

I never realised that lots of manufacturers use ACOS protocol to send tally and UMD-names between vision mixers, multi-viewers and routers. I assumed that big switchers still used GPI closures for tallies but when I got to a customer's site to make a GVG Kayak mixer talk to a Miranda Kaleido multi-viewer I couldn't find [...]

By |2016-10-29T08:55:14+00:00January 29th, 2014|Categories: Broadcast Engineering|Tags: , |0 Comments

Amulet – they fixed OS-X's Temporal Dithering issue

As mentioned in a previous post temporal dithering on OS-X has proved troublesome with Amulet (and in fact it bedevils all KVM-over-IP systems). The guys at Amulet have written a Kernel Extension that stops the card turning on temporal dithering. James, their engineer, explained to me that it's a different technique between nVidia and Radeon, [...]

By |2016-10-29T08:55:15+00:00January 29th, 2014|Categories: Broadcast Engineering, tips|Tags: , |1 Comment

Cladding vs. Core Alignment fusion splicers

For seven years we've been using Tritec Fase II fusion splicers; we have two kits composing the splicers themselves (camera or microscope inspection), clevers and finishing ovens for the splice-protectors. If you're in the business of bespoke fibre then fusion splicing really is the only way to go as you get superior performance in termination [...]

By |2016-10-29T08:55:15+00:00January 29th, 2014|Categories: Broadcast Engineering|Tags: |0 Comments

3G SDi parts becoming commodity?

My pals at Lindy (who I buy lots of computer connectivity parts from) sent me a bunch of engineering samples of 3G-capable SDi parts; DAs, fibre transceivers etc. from one of their OEM manufacturers in the Far East. For very modestly priced pieces they were excellent. The eye-pattern (above) is the output of their re-clocking [...]

By |2016-10-29T08:55:16+00:00January 29th, 2014|Categories: Broadcast Engineering, tips|Tags: , , |0 Comments

EDID isn't the only thing that graphics cards look at

Avid Media Composer insists on re-starting when it sees a change of monitor. I always assumed that it was done via Windows detecting a new EDID profile but it turns out that if you unplug and re-plug the same monitor (i.e. EXACTLY the same EDID data - even s/n) then the same happens and so [...]

By |2016-10-29T08:55:16+00:00January 29th, 2014|Categories: Broadcast Engineering, tips|Tags: , , |0 Comments

Colour perception – a couple of notes

  Colour perception is a complicated business; most people have tristimulus vision - that is we perceive colour (broadly speaking) in reds, greens and blues. Your brain does the clever stuff of filling in the intermediate colours - if you're seeing a colour between red and green (yellow) the mix of stimulation of the red [...]

By |2016-10-29T08:55:16+00:00January 29th, 2014|Categories: Broadcast Engineering, tips|Tags: , , |0 Comments

Passive low-value audio pads

I've often had to knock up audio attenuators to make music gear (which is typically +4dBu for zero level against 0dBu for broadcast) and my usual m.o. is to approximate everything around a 10k potentiometer; typically 100ohm sending impedance, 10k ohm terminating impedance and an H-network for balanced lines and a T-network for unbalanced. You [...]

By |2016-10-29T08:55:16+00:00January 29th, 2014|Categories: Broadcast Engineering|Tags: |0 Comments

Chassis vs Signal earth on RS422 remotes

Grounding is essential to reliable operation of any RS422 connections. It is also the most overlooked and least understood. The easiest way to ground your RS422 equipment is to simply use “Earth” ground as your return path. Although easy this may not be the best method for grounding your application, because current leaking from equipment, [...]

By |2016-10-29T08:55:18+00:00January 10th, 2014|Categories: Broadcast Engineering, tips|Tags: , , |0 Comments

Beware the fibre contamination!

These are two pictures taken down my hand-held fibre microscope - you can see the core and buffer of two examples of fibres that were spliced maybe three months ago in a new building. I suspect builder/decorator dust contamination and even though they have had their cover-pieces on they aren't air-tight and so we're now [...]

By |2016-10-29T08:55:18+00:00January 10th, 2014|Categories: Broadcast Engineering, tips|Tags: , , , |0 Comments