Master Clock: Difference between revisions
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<div class="rightbox">[[Media:Isochrone Trinity Master Clock Manual.pdf|'''User Manual''']]</div> | <div class="rightbox">[[Media:Isochrone Trinity Master Clock Manual.pdf|'''User Manual''']]</div> | ||
The master clock allows devices that require accurate timing to be synchronised. The clock signal is distributed through the [[Facility Panels]]. | |||
Clock synchronisation is critically important when pairing audio and video, or when using multiple audio or video devices together. If devices do not receive accurate clock signals they will ''[https://en.wikipedia.org/wiki/Clock_drift drift],'' causing artefacts and communication problems. | |||
==Rates== | |||
The clock rates have been chosen to provide the greatest degree of interoperability between devices according to standards set by the [http://www.aes.org/ AES]. | |||
* Audio clock rate: '''48kHz''' | |||
* Video clock rate: '''1080i50 (HD)''' | |||
The house clock rates must not be changed. If you require different clock rates, you must use standalone clocking generated by a local device as the master. | |||
It is recommended by the [http://www.aes.org/ AES] that 48kHz be used in preference to 44.1kHz for audio recording, which provides the highest quality for the latest audio format standards (eg. Blu-ray and Dolby Atmos) and the greatest degree of compatibility. | |||
==Clocking== | |||
Devices can be clocked locally or synchronised to a high definition master clock which ensures every device receives the same timing pulse. This can be used to ensure a transmission 'lock' can be maintained between digital devices and is especially critical when working with audio for video content. | |||
==Hardware== | ==Hardware== | ||
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New Adelphi uses an [http://en.antelopeaudio.com/products/isochrone-trinity/ Antelope Isochrone Trinity] master clock. This unit provides three audio clock outputs, three HD video clock outputs and four SD clock outputs. | New Adelphi uses an [http://en.antelopeaudio.com/products/isochrone-trinity/ Antelope Isochrone Trinity] master clock. This unit provides three audio clock outputs, three HD video clock outputs and four SD clock outputs. | ||
Revision as of 13:24, 15 May 2018
The master clock allows devices that require accurate timing to be synchronised. The clock signal is distributed through the Facility Panels.
Clock synchronisation is critically important when pairing audio and video, or when using multiple audio or video devices together. If devices do not receive accurate clock signals they will drift, causing artefacts and communication problems.
Rates
The clock rates have been chosen to provide the greatest degree of interoperability between devices according to standards set by the AES.
- Audio clock rate: 48kHz
- Video clock rate: 1080i50 (HD)
The house clock rates must not be changed. If you require different clock rates, you must use standalone clocking generated by a local device as the master.
It is recommended by the AES that 48kHz be used in preference to 44.1kHz for audio recording, which provides the highest quality for the latest audio format standards (eg. Blu-ray and Dolby Atmos) and the greatest degree of compatibility.
Clocking
Devices can be clocked locally or synchronised to a high definition master clock which ensures every device receives the same timing pulse. This can be used to ensure a transmission 'lock' can be maintained between digital devices and is especially critical when working with audio for video content.
Hardware
New Adelphi uses an Antelope Isochrone Trinity master clock. This unit provides three audio clock outputs, three HD video clock outputs and four SD clock outputs.