Barracuda Networks SP4 Bedienungsanleitung PDF herunterladen (Seite 56)

STEREO GENERATOR –LEVEL AND WORKING MODES

ENG

Axel Technology srl

www.axeltechnology.com

MODE

TYPE

DESCRIPTION / NOTES

Linear Mode

Manual

Barracuda’ behaviour is totally similar to that of an analog,

traditional stereo encoder. There is

no MPX clipper

intervention

. Max output deviation is 100 kHz. Input

headroom around 10 dB.

Linear

Full Range

Manual

Barracuda’ behaviour is totally similar to that of an analog,

traditional stereo encoder. There is no MPX clipper

intervention. There is no deviation limit

. Input headroom is

around 20 dB. All signal components (including filter

overshoots) will contribute for the final deviation on-air.

Main signal deviation (and therefore signal ‘loudness’) will

be therefore significantly lower than by using a well-tuned

Clipper.

MPX Clipper

Manual

MPX Clipper stage is enabled. Audio input levels are fully

adjustable. The portion of clipped audio signal is user-

definable. being Clipper stage enabled, the generated signal

will have a strong ‘presence’ effect, as it exploits the entire

deviation range available. This operating mode is

always

recommended.

24.4 HOW TO ADJUST THE INPUT GAIN ON MANUAL WORK MODES

This section should be performed for both the analog and digital audio inputs. The Barracuda will store level settings for

each separately allowing to switch between analog and AES/EBU inputs without resetting the input level.

Note that there are different controls for calibrating digital versus analog audio inputs.

BEFORE CALIBRATION, MAKE SURE YOU HAVE PREEMPHASIS SET TO THE APPROPRIATE TIME

FOR YOUR APPLICATION AS THIS WILL AFFECT THE OUTPUT LEVEL.

At this moment, Warning LED on the front panel might flash due to Audio Input overload and/or MPX signal exceeding

deviation limit.

Proper overall Clipper stage tuning coincides with Warning LED turning off

. Therefore Audio input

calibration might be not able to accomplish this condition.

Access the INPUT-MONITOR PAGE on the front panel Menu (or take a look to the left upper blackboard on the Pc

control software and web browser screens).

It can have 3 different graphic forms, depending whether the Clipper is active or not and which Linear mode in engaged

(Full Range or Linear):

24.4.1 LINEAR MODE

With a 0 dB MPX level, Nominal Input Level reference indicates the

input audio level (peak level) which corresponds to 75 kHz deviation.

Sensibility and Gain controls should be adjusted so that the input

program peak level coincides with the 100% modulation ‘ceiling’.

Note: Setup should be performed for both the analog and digital audio

inputs. The Barracuda will store your level settings for each input

separately allowing you to switch between analog and AES/EBU inputs without resetting the input level. Note that there

are different controls for calibrating digital versus analog audio inputs

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