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 processing
Both solutions can be used effectively to address...
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 GV Orbit, iControl, or iControl Solo PC GUI
- 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.
MEDIA GALLERY
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 |
