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Automatic Loudness Control (ALC)

Advanced Loudness Control Solutions Which Prevent Excessive Audio Jumps

Excessive loudness variation is probably the most common viewer complaint, and it's now something you can eliminate entirely. Our automatic loudness control solutions for our Densité interfaces are designed to address all typical loudness problems, including audio jumps between programs and commercials, without adversely impacting the program content.

Uniquely, Grass Valley offers two distinct automatic loudness control solutions which bring together the very best loudness technologies:

  • ALC with Linear Acoustic AEROMAX processing
  • ALC with Grass Valley wideband audio...

FEATURES

  • Automatic loudness control option for Densité interfaces smooths out irritating loudness level differences between program segments and between different channels
  • High-quality processing prevents adverse effects to program content
  • Three different processing variants allow selection to best match a facility's content and workflow
  • Multiband or wideband processing
  • Up to 16 audio channels processing capacity
  • Multiprogram support using mono, stereo, 5.1 or 7.1 audio
  • "Set and forget" mode with setting of output target loudness per program
  • Actively managed processing modes, with playout automation driving a bypass mode or different profiles
  • Loudness monitoring according to ITU-R BS.1770
  • Upmixing can be combined with ALC for optimal integration (Linear Acoustic and ALC variants)
  • Manual remote control by iControl, iControl Solo PC GUI or RCP-200 remote panel
  • Now supporting loudness measurement and true-peak limiter according to ITU-R BS.1770-3

SPECIFICATIONS

Quick ALC Comparison Table
  ALC with Linear Acoustic Processing ALC with Grass Valley Proprietary Processing
Max number of programs 2 8
Max number of channels 8 16
Number of channels/pgm 1, 2 or 6 1, 2, 3, 4, 6 or 8
Audio formats PCM in / PCM out
up to 24 bits at 48 kHz
PCM in / PCM out
up to 24 bits at 48 kHz
Technology AeroMAX, multiband Wideband
Pulling range ±36 dB -31 to 18 dB
Limiter range -6 to 0 dBFS -20 to dBFS true-peak
Embedded Upmixing option Yes No
Loudness Measurement methods ITU-R BS.1770 ITU-R BS.1770-3
Profile switching (including ALC bypass)
via automation/GPI
Yes Yes
Form factor Submodule Software option

See datasheet for technical specifications.

ORDERING INFORMATION

MOD-LA-ALC-2 2-channel ALC licensed by Linear Acoustic
MOD-LA-ALC-6 6-channel ALC licensed by Linear Acoustic
MOD-LA-ALC-8 8-channel ALC licensed by Linear Acoustic
MOD-LA-ALC-2-DUP 2-channel ALC and up mix licensed by Linear Acoustic
MOD-LA-ALC-6-DUP 6-channel ALC and up mix licensed by Linear Acoustic
MOD-LA-ALC-8-DUP 8-channel ALC and up mix licensed by Linear Acoustic

ALC options for XVP-3901 up/down/crossconverter host module*
XVP-3901-OPT-ALC-2 2-channel on-board ALC option by Grass Valley
XVP-3901-OPT-ALC-6 6-channel on-board ALC option by Grass Valley
XVP-3901-OPT-ALC-8 8-channel on-board ALC option by Grass Valley
XVP-3901-OPT-ALC-16 16-channel on-board ALC option by Grass Valley

ALC options for EAP-3901 embedded audio processor*
EAP-3901-OPT-ALC-2 2-channel on-board ALC option by Grass Valley
EAP-3901-OPT-ALC-6 6-channel on-board ALC option by Grass Valley
EAP-3901-OPT-ALC-8 8-channel on-board ALC option by Grass Valley
EAP-3901-OPT-ALC-16 16-channel on-board ALC option by Grass Valley

ALC options for HCO-3901 change-over
HCO-3901-OPT-ALC-2 2-channel on-board ALC option by Grass Valley
HCO-3901-OPT-ALC-6 6-channel on-board ALC option by Grass Valley
HCO-3901-OPT-ALC-8 8-channel on-board ALC option by Grass Valley
HCO-3901-OPT-ALC-16 16-channel on-board ALC option by Grass Valley
* If upmixing is required, it can be done on separate submodule.

MOD-LA-DUP-701 Upmixing using Linear Acoustic Technology upMAX

DOCUMENTS & DOWNLOADS

DATASHEETS

Automatic Loudness Control (ALC)

Excessive loudness variation is probably the most common viewer complaint, and it’s now something you can eliminate entirely. Our automatic loudness control solutions for our Densité interfaces are designed to address all typical loudness problems, including audio jumps between programs and commercials, without adversely impacting the program content.

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DOCUMENTATION LIBRARY

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