LAWO mc256 MKII, Техническое руководство

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mc²56 MKII Technical Manual V5.10.2/1 86
Chapter 2: Installation
System Settings
Wordclock Options
This topic defines the system's sample rate and sync reference.
Sample Rate
The Max Sample Rate field is for display purposes only, and shows the highest sample rate available. Note that
the option to run at higher (96kHz or 88.2kHz) or lower (48kHz or 44.1kHz) sample rates is made within the
AdminHD configuration and cannot be modified from the console.
Higher sample rates use twice as much DSP resource as lower sample rates; this is reflected in the DSP
Configurations display. Higher sample rates also affect the crosspoint capacity of the routing matrix (8k² at
48kHz, or 4k² at 96kHz).
The Sample Rate option will change the operating frequency of the console. If the system is configured to run at
lower sample rates (by AdminHD), then you can select either 48kHz or 44.1kHz operation. If the system is
configured to run at higher sample rates, then you can select 96kHz , 88.2kHz , 48kHz or 44.1kHz operation.
Warning
It is NOT recommended to change the sample rate unless you wish to use an external Wordclock reference
signal. If this is the case, then the frequency of the sync source MUST match the Sample Rate option.
You should mute your loudspeakers when changing the Sample Rate option.
If your system includes RAVENNA Net devices, such as Lawo's A__line , then the sample rate of these
devices must be changed manually using the RAVENNA Web GUI.
Sync Source
The Nova73 offers a fully redundant clock source structure with the ability to lock to sync from an incoming MADI
or RAVENNA signal, one of the two external sync inputs or its own internal sync generator.
The Active Source field is for display purposes only, and shows the active synchronization source.
Information about each external sync source is shown in the lower part of the display; if a signal is not present or
invalid, then you will see
N/A :
·
Multichannel – sync from an incoming MADI or RAVENNA port. The port must be defined using
AdminHD . For RAVENNA, this is either the "listening" port which will receive PTP clock from the network,
or the "transmitting" port if the Nova73 is operating as a PTP Master.
·
Sync Port 1 – connected to the Nova73 rear panel (Wordclock, Video Black Burst or AES3-id).
·
Sync Port 2 – connected to the Nova73 rear panel (Wordclock, Video Black Burst or AES3-id).