Tieline Bridge-IT, User Manual

Page: 22 / 227

22 Bridge-IT Manual v4.0
© Tieline Research Pty. Ltd. 2019
Intelligent Gain Control (IGC)
When the broadcast action really starts to heat up, the codec's inbuilt DSP limiter automatically
takes care of any instantaneous audio peaks that occur in demanding broadcast situations. IGC
(Intelligent Gain Control) is enabled by default and is activated at +20 dBu (G5 audio scale) and
+14dBu (G3 audio scale) to prevent audio clipping. IGC automatically adjusts high audio input
levels downwards until they are acceptable. If IGC auto level recovery (IGC Level) is not enabled,
the input level will remain at the adjusted point until the input gain is manually adjusted again by
the user. If IGC is active in the codec it is indicated in the PPM meter section. To adjust this
setting:
1. Press the SETTINGS button.
2. Navigate to Audio and press .
3.
Navigate to
IGC
and press
to toggle between Enabled and Disabled .
IGC Auto Level Recovery
IGC Level works with IGC to detect when incoming audio levels have reduced sufficiently.
There are two settings; Auto and Fixed .
If the IGC Level setting is Auto then the codec will return input levels to the gain setting prior
to IGC being activated. The codec takes just 250 milliseconds to detect audio levels have
returned to normal (after IGC Level has been initiated) and will then return the levels to the
previous setting within half a second. This response is linear.
If the setting is Fixed then audio levels will remain lower and not return to the original setting.
To adjust this setting:
1. Press the SETTINGS button.
2. Navigate to Audio and press .
3. Navigate to IGC Level and press to toggle between Auto and Fixed .
Ganging Audio Channels
Ganging allows you to adjust the audio level of both inputs simultaneously.
1. Press the button and the right arrow button to open the Input Audio Level
adjustment screen.
2. Use the up and down arrow buttons to navigate to and select Gang 1 + 2 Enabled or
Disabled.
3. Press the button to select Enabled .
4. Use the up and down arrow buttons to highlight and select the audio channels.
5. Use the left and right arrow buttons to adjust the levels for both inputs up or down
simultaneously.
6. Press the RETURN button to exit the screen.
When channels 1 and 2 are ganged together:
·
Both channels highlight together when selected.
·
You can adjust the audio of both channels simultaneously.
· The gain setting for both channels is automatically set to match the gain level of the lowest
of the two channels when ganging is configured.
·
If one channel is turned on when ganging is configured then the other one will be turned on
automatically.