Barracuda Networks SP4 Manual de usuario descargar pdf (Pagina 58)

STEREO GENERATOR –LEVEL AND WORKING MODES

ENG

Axel Technology srl

www.axeltechnology.com

24.4.2 LINEAR – FULL RANGE

If a better headroom / input dynamic range (than the Linear Mode) is

required, LINEAR-FULL RANGE input mode is provided. No clipping

and no deviation limit is applied to signal processing in this case.

Input headroom ranges up to 20 dB and an overall MPX level control is

not provided

. Nominal input level reference is nearer to the left margin

than in the Linear Mode – MANUAL .

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.

1) The Sensitivity Level (Analog or Digital) parameter sets the gain for both channels. After adjustment, peak indication

hitting the Nominal Input reference point on the display or a little higher (see picture here below) is proper. This

corresponds to around 20 dB system headroom.

2) If further gain or attenuation is required, the individual left/ right Gains can be adjusted using the Input Left and

Input Right parameters

With

Post Gain control set to 0 dB

After digital or analog input calibrating, You may set the analog level of the composite signal on the BNC connector.

Please adjust the Post Gain control until you reach the desired modulation level.

, the reference point displayed in the picture indicates the audio peak level associated

to a 75 kHz deviation.

24.4.3 CLIPPER MODE

Metering scale is divided into three zones.

Linear Zone

This identifies the portion of audio signal that is

affected only by Low-Pass / Preemphasis filters. No

alteration due to the clipping is introduced. Signal is

only affected by input filters and pre-emphasis.

Clipper Zone

This identifies the portion of audio signal being

clipped.

Over Zone

This identifies a ‘distortion’

zone, which is related to

a ‘out-of-band’ energy. Signal ranging in this zone

should be avoided.

With a signal ranging in the Linear zone, You will need to increase sensitivity or Gain in order to get a signal hitting the

Clipper Zone. In the following pages two preferred ways are described: with 100% Modulation Tone and with Processed

Audio Signal.

CLIPPER MODE - CALIBRATION THROUGH REFERENCE TONE

1) Apply a Reference Tone (such as the Ref Tone generated by Falcon 15, Falcon 35 and Falcon 50 by Axel

Technology, TigerShark or Falcon Five series) at its maximum level to the Barracuda analog or AES/EBU inputs.

This will ensure right headroom when using pre-emphasis.

The Peak Tone identifies the maximum peak value of the audio and MPX signals reached by the equipment

2) Select the INPUT Module Setup menu and adjust the Sensitivity Level (Analog or Digital) control. After adjustment,

peak indication hitting the left margin of Clipper zone is proper (see picture here below). This corresponds to a

around 20 dB system headroom.

3) If further gain or attenuation is required, the individual left/ right Gains can be adjusted using the Input Left and Input

Right parameters.

Following this calibration procedure, audio material will be kept unaltered and only spurious signal will be clipped.

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Barracuda Networks SP4 Manual de usuario Pagina 58

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