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7th Sense Delta Media Server User Manual
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7th Sense Delta Media Server User Manual

Synchronising delta media systems
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Delta Media Server
Synchronising Delta Media
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User Guide
M280-1

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Summary of Contents for 7th Sense Delta Media Server

  • Page 1 Delta Media Server Synchronising Delta Media Systems User Guide M280-1...
  • Page 2 Synchronising Delta Media Systems : User Guide Trademark Information Delta Media Server is a trademark of 7thSense Design Ltd. Brand or product names may be registered trademarks of their respective owners. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.

  • Page 3: Table Of Contents

    Contents Introduction to Timing Marking Time Genlock: Synchronizing Devices Timing Sources 7thLTCReader: Chasing LTC Timing Glossary Document Information Index Synchroni s i ng Del ta Medi a Sys tems © 2018 7thSens e Des i gn...

  • Page 4: Introduction To Timing

    60 fps, drift between system elements can become apparent. This guide provides a basic overview to how the elements in a Delta Media Server show system can be synchronised, and when and why this matters.

  • Page 5: Marking Time

    60 fps, drift between system elements can become apparent. This guide provides a basic overview to how the elements in a Delta Media Server show system can be synchronised, and when and why this matters.
  • Page 6 Marking Time Audio Time LTC audio tracks carry embedded SMPTE timecode, which enables multiple servers to synchronise their playheads to an external LTC timecode. This code is essentially time reference meta data. If the server is not genlocked to the LTC source, this can cause drift between audio and video, showing up easily in lip- synced media, although not obvious with ambient or soundtrack audio.

  • Page 7: Genlock: Synchronizing Devices

    Genlock: Synchronizing Devices Genlock: Synchronizing Devices GPU Graphics Cards Within a media server, multiple GPUs and displays must be synchronized. This is called output locking, and ensures that all displays refresh and scan together, using a sync module (card) designed for the GPUs in use.
  • Page 8 Genlock: Synchronizing Devices The NVIDIA® Quadro® Sync II is very similar, partnering up to five of their Quadro Pascal series cards: HD-SDI Graphics Cards HD-SDI graphics cards, such as from Bluefish444 and Matrox® have built-in synchronization (house-sync input) and do not require secondary sync cards, though multiple HDSDI cards in a single server require individual sync cables, as there is no internal distribution.
  • Page 9 Genlock: Synchronizing Devices Sync Generators: for Display, and More ‘House sync’ modules (also known as black-burst or sync generators), such as these examples, with the required number of outputs, generate a configurable square-wave sync pulse for genlocking the sync cards and other timing-dependent devices, such as show controllers, live capture cards, and separate audio systems: The smaller unit, above, can be used to provide a reference pulse simply for display synchronisation.

  • Page 10: Timing Sources

    Timing Sources Timing Sources Sync Generators DeltaServer syncs its frame playback to the server GPU clock (in ‘Auto’ or ‘Hardware Timed’ modes), and each GPU can be synced in turn to a central house sync clock. Such sync pulse generators and word clocks do not convey data, only a highly accurate bit-rate as a common timing (not time) reference.
  • Page 11 Timing Sources Chasing LTC Multiple Delta servers that are not master-slave related, or are in different master-slave timing groups, and systems incorporating other devices, or control desks, will need more than a Delta timeline timing packet, so instead we can use a common timing source of linear timecode (LTC), in an audio stream. This could be played as an audio track on one Delta server, but it must be accommodated within the specification of the server providing the LTC stream, since it requires media storage capacity, bandwidth, and an audio channel.
  • Page 12 Timing Sources What this does not do, is synchronise a non-Delta LTC player with any other device. So if an LTC source is used that is not genlocked, then the LTC player system clock will inevitably drift from that of the Delta server(s).

  • Page 13: 7Thltcreader: Chasing Ltc

    7thLTCReader: Chasing LTC 7thLTCReader: Chasing LTC ASIO4All is free, a universal ASIO driver for WDM sound cards, and must be downloaded and installed on a Delta Media Servers sending or receiving LTC. If using 7thLTCReader, for the first time, this can be found on the Delta server in C:\7thSense Data\Software &...
  • Page 14 7thLTCReader: Chasing LTC In timeline view, click the LTC button for the timeline to play by chasing LTC: Delta Server providing LTC Output For versions of Delta greater than or equal to: 2.3.49, 2.4.27 or 2.5.4 and 2.6, see the respective guides for configuring LTC Output in DeltaGUI: Configure >...

  • Page 15: Timing Glossary

    Timing Glossary Timing Glossary 29.97 NTSC standard, the TV broadcast video framerate, originating from early colour TV transmission problems between chrominance and audio carrier signal phasing at 30 fps. Resolved through use of drop frame timecoding. Adrielec A SMPTE device enabling linear timecode (LTC) chasing. A product of Adrienne Electronics Corporation (AEC).
  • Page 16 Timing Glossary tearing Display image discontinuity caused by display synchronisation problems. timecode Relative position in a movie, expressed as hh:mm:ss:ff (hours, minutes, seconds, frames) timing mode In Delta: display a Delta timeline in SMPTE, frames or seconds. word clock A digital audio signal designed for keeping digital audio devices in sync with a constant, precisely-timed bit-rate of 44.1 or 48 kHz.

  • Page 17: Document Information

    Document Information Document Information Date Document Software Revision Details Author/Editor edition version Ja nua ry 2018 Del ta 2.5 a nd a bove New rel ea s e Andi e Da vi ds on Synchroni s i ng Del ta Medi a Sys tems ©...

  • Page 18: Index

    Index 7thLTCReader 10, 13 sync generators synchronising systems synchronizing systems audio sync VSync chasing LTC word clock 7, 10 Delta timeline timing packets display sync display synchronization (synchronisation) frame sync genlocking systems glossary of terms GPU clock house sync chasing (Delta) sources LTC reader LTCReader...
  • Page 20 7thSense Design Ltd 7thSense Design LLC 2 The Courtyard Shoreham Road 1032 N Crooks Road Upper Beeding Suite H Steyning Clawson West Sussex Michigan 45017 BN44 3TN E: info@7thsensedesign.com T: +44 (0) 1903 812299 T: +1 248 599 2717 W: 7thsensedesign.com...