Axia Analog Node Manual de usuario descargar pdf (Pagina 19)

3: Advanced Programming • 11

Version 2.0, February, 2007

streams, which can be used for all common sources,

like CD players.

Tip: Slow streams conserve network bandwidth

and are a better choice for delivering audio to

computers for recording and playback.

• Surround – Enables “5.1+Stereo” surround mode.

This choice is only available on ports 1 and 5. Select

ing surround mode creates a bundle of 4 ports: 1-4

or 5-8.

Gain (dB)

This allows you to change the input gain in the digi

tal domain. Care must be taken to ensure peak levels do

not exceed 0 dBfs to prevent clipping. Up to 18 dB of

Gain may be selected in steps of 1 dB.

The analog inputs clip point remains at +24 dBu

so this level must not be exceeded. The rare

device with a clip point in excess of +24 dBu will

require an external pad.

Analog nodes – The Gain setting may be use to adjust

for differing peak output levels between different “+4

nominal” equipment, or it can be used to accommodate

analog sources that are below +4 nominal levels.

The default setting of 0dB accommodates input lev-

•

els at nominal levels of +4 dBu

with a clip point of 24 dBu

(e.g. 20 dB headroom). When

feeding the node’s inputs from

a “+4 nominal” device that

clips at some lower level (for

example +18 dBu, e.g. 14 dB

headroom), you can increase

the gain (by 6 dB in our exam

ple). to match this device’s clip

point to the node’s 0 dBfs point.

This adjustment can also be

used in cases where a low-lev

el signal source must be used.

Again you should use the rated

clip point of the source device

to determine the closest set

ting. Simply add gain to bring

this rated clip point up to +24 dBu.

AES nodes – in the case of AES nodes, this adjust-

ment can be used to adjust system headroom. This should

be done with care and deliberation.

While we don’t recommend setting levels “by eye,”

if you choose to do so, you can view the Source levels

and adjust the Gain setting from the Meters page, see

below.

AES Mode

This option is only available on the Sources page for

the AES node. There are two possible options for the

setting:

Asynchronous – this is the usual setting and enables

sample rate conversion. Any valid AES source can

be used in this mode without concerns about drop-

outs due to mismatched clocks.

Synchronous – this setting can be used if the device

transmitting the AES signal is synchronised to the

Livewire network. For example, if the device syn-

chronised its outputs to its input, and the input were

fed we from an Axia AES node. Or, if the device had

at Sync input fed from a Axia AES node. Enabling

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