Wheatstone Corporation WheatNet-IP BLADE3, Техническое руководство, Страница: 205 / 366

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A U R A 1 I P P R O G U I
WheatNet-IP BLADE 3 / Jan 2016
The operation of the Gate Thresh control is straightforward. When audio in a processing
band falls below the value set by the Gate Thresh control, the AGC will freeze its gain.
The compressor may be allowed to decrease gain if needed, but no additional gain increase
will occur by the AGC once audio has fallen below this value.
The Gate Thresh is calibrated in dBFS (decibels Full Scale) a common calibration in
digital audio equipment. Because the internal audio reference level is -20dBFS (to allow
headroom) a normal Gate Threshold setting will be as much as 24dB to 30dB below this
value. Therefore it is quite normal to see Gate Threshold settings that are in the range of
-44dB to -60dB. The gate function may be defeated by adjusting the Gate Thresh control
towards -80dB which will then disable it and cause the Gate Thresh display to indicate OFF.
The Gate Delay setting tells the AGC how long to wait after the audio falls below the
Gate Thresh before it freezes the gain. The control range is 50ms to 500ms. Setting the
Gate Delay control to times greater than about 100ms loosens up its action which helps
gating action when the level of audio passages is just riding the Gate Thresh level.
The Gated Mode control decides if the AGC should freeze the gain when audio falls
below the Gate Thresh (Gate), or if it should allow the gain to very slowly recover towards
0dB gain reduction (Ooze). As explained in the introduction, allowing the gain to freeze
prevents noise suck-up in the absence of audio. The Ooze function, on the other hand,
can be very helpful on formats such as Classical or Jazz, where it might be inappropriate
for the AGC gain to get stuck when audio was present, but below the Gate Threshold
setting. Using the Ooze mode to allow the gain to slowly recover sounds very natural, and
therefore this is the setting that is recommended for the more gentle formats.
Number of Bands
The Aura1ip’s AGC, Compressor and Limiter sections may be operated in broadband,
2 band or 3 band modes. Whichever operating mode is selected, the
appropriate number of columns of processing controls will appear in
the Pro GUI. When switching from 3 Band, to 2 Band, to Broadband
mode, columns of controls will be defeated and hidden, revealing only
the controls available for the number of bands chosen.
Comparison of AGC controls visible in 3 band mode (left),
2 band mode (center), and broadband mode (right)
Crossovers
The purpose of a crossover (Xover) is to separate the audio spectrum into different
frequency bands prior to processing. The reason this is done is to eliminate or reduce
the effects of gain control happening in one part of the spectrum from affecting another.