Calrec APOLLO Installation & Technical Manual

Also see for Apollo: Operator's manual Installation manual

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Calrec APOLLO Installation & Technical Manual Manual pdf 43 page image

CALREC Putting Sound in the Picture 43The source currently locked to is displayedon the screen. Any sync failures to thelocal core will be reported by SystemStatus. If a failed sync input becomesgood, the console will NOT automaticallyre-lock to it as any changeover in synccould affect audio. Switching back to theprimary sync choice is done manually byclicking 'Reset to 1st' on the sync page, orautomatically after the next boot / reset.To change the sync sources selected,click on the desired source on the left, thedesired destination on the right and thenclick 'Patch'.The video inputs can be fed with analogueor digital video in NTSC, PAL or a varietyof HD / tri-level formats.The correct video format for each videoinput being used needs to be specifiedfrom the Sync page.SynchronisationatdifferentsampleratesFrom Version 8 onwards, Artemis canoperate at 48kHz or 96kHz. Hydra2runs at 48kHz irrespective of whether theconsoles and I/O boxes are running at96kHz or not. It simply uses 2 samplesper 96kHz signal.Hydra2 always runs at 48kHz, the systemwill still require a 48kHz sync if using itsAES3 or Wordclock inputs, even if allconsoles and I/O are operating at 96kHz.SYNCHRONISATIONThe Apollo processing core has 4inputs to allow connection of externalsync. If no external sync is connectedand selected, the console will free-run on its own synchronisation clock,generated by the active router card.General rules of good practise requirethat all equipment connected to the audioconsole's digital inputs and outputs areall locked to the same referenced syncsource as the console to ensure cleanaudio.In systems with multiple Calrecprocessing cores; i.e. where morethan one Apollo/Artemis consolesare connected together, or wherestandalone Calrec router cores areused, it is of paramount importancethat all connected processing coresare locked to the same referencedsync source.One or more cores receiving a syncsignal that is not locked from thesame clock reference as other coreswill cause interruptions to both audioand data carried by the routers. Thiscan lead to false error warnings andI/O boxes going offline. Thereforeit is essential to consider a robustsync distribution design for thefacility and to ensure all points inthe chain are correctly configured tolock to the appropriate input and noelements such as sync regeneratorsare changing the reference source orfree-running.It is also recommended that backup syncsources and paths are considered tomaintain full functionality in the event ofthe loss of any part of the facilities' syncdistribution system.External sync sources can be fed tothe BNC connectors at the top of theprocessing core (Figure 1). Two inputs areavailable for video formats, as well as aninput for TTL Wordclock and an input forAES3 digital audio reference.SyncsourceselectionThe sync sources to be used have tobe selected from the Console MainApplication, >System Settings>Syncpage, or by the Hydra2 Organiser.The Main Application must be intechnician mode (enter username andpassword on the Tech page) to changesync settings.Only one sync source is active and lockedto at any given time. Multiple sourcescan be selected by priority to determinethe next choice to use in the event of theactive source failing.The Sync page shows the availablesources on the left and the selectedsources on the right. The last of the'selectable' sources is actually fixed asInternal to ensure that console will run onits own clock when no external sync ispresent.On boot up or reset, the console attemptsto lock to the first sync source in theselection list. If it cannot lock to the firstchoice, it will move down the list in orderuntil a choice can be locked to.FIGURE 1 - SYNC INPUTSVIDEO 1AES3 VIDEO 2 WORDCLOCK