DaySequerra - Loudness Control
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NLC4ST Stereo Loudness Control.
NLC4ST Stereo Loudness Control
The DaySequerra NLC4ST provides the ability to independently process four stereo channels of audio simultaneously and apply loudness correction, all while occupying only one rack unit of space. NLC4ST is well suited for use in large facilities were space, power and heating constraints require a higher-density solution.
NLC4ST Stereo Loudness Control measures and controls perceived loudness of the program audio using the industry-standard ITU-R BS.1770/1 as well as DTS Neural Loudness Measure (NLM) and DTS Neural Loudness Control (NLC) algorithms. The proprietary NLC and NLM algorithms were developed by DTS after extensive research into human hearing and perceived loudness.
The proprietary DTS-Neural Loudness Measure algorithm uses a perceptual model of human hearing to more accurately detect spectral and density differences, inter-channel relationships and temporal overlaps in any audio content, resulting in a more accurate perceived loudness measurement over time. NLC4ST displays the perceived loudness measurement results in an easy-to-read numerical format with a moving average over time, eliminating the current practice of interpreting traditional VU or PPM indicators; neither of which can measure perceived loudness.
Audio loudness and how it is perceived by humans is widely misunderstood. Loudness is a perceptual property of an audio signal when it is reproduced acoustically. It is a complex non-linear function of amplitude, frequency and bandwidth. Current audio level meters measure the level of audio signals expressed as the amplitude of the signal - either the RMS (root mean square) voltage of an electrical signal or the sound pressure of an acoustical signal. Neither of these measurements, although widely accepted, provides accurate indications of how viewers will perceive the audio loudness.
The proprietary DTS Neural Loudness Control is an advanced loudness leveling algorithm that applies the appropriate gain or attenuation to maintain the broadcaster-defined loudness level. The resulting audio has a naturally open, dynamic quality without the annoying side-effects of traditional energy-based volume management solutions used by other manufacturers. The result is audio with a natural, open quality and a consistent audio experience for all viewers with the loudness controlled without squashing the quality of the audio.
NLC actually mimics human perception of audio and provides tight control of loudness. NLC detects spectral and density differences, inter-channel relationships and temporal overlaps within the audio signal. After detection, NLC adjusts the audio to achieve a user-defined loudness level. Control the loudness, don't squash it!
Four AES inputs provides for simultaneous measurement of all stereo inputs. To improve system reliability and up-time, the DaySequerra NLC4ST uses a robust DSP-based processing platform rather than the PC-based approach used by most other manufacturers to completely avoid broadcast disruptions caused by operating system lockups. An Ethernet interface provides long-term logging and field software updates capability.
Applications for the DaySequerra NLC4ST include network and program ingest centers, satellite facilities; cable head-end facilities, turnaround uplinks, broadcast quality control, and post-production facilities.
Key Features of the NLC4ST
- Guarantees a consistent viewer experience despite variations in consumer's equipment
- Adheres to the ITU BS.1770 loudness recommendation, and--more importantly--agrees with your viewer's perception of loudness
- Manages loudness without a "squashed" or compressed sound
- Corrects loudness while preserving the original equal loudness curve
- Using look-ahead technology, makes large gain corrections imperceptible
Technical Specification For NLC4ST |
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| Inputs | 4 AES-3 Inputs for four channels of stereo |
| Outputs | 4 AES-3 Outputs for four channels of stereo |
| Digital Inputs & Outputs | AES/EBU, 75Ω, unbalanced BNC |
| Sample Rate | 32kHz-96kHz |
| Latency | 64ms @48kHz sampling rate |
| Alarms | DB-9 female connector, 0-5VDC TTL |
| Ethernet | 10/100-BASE-T for field software updates, logging and remote control |
| Dimensions and Weight | 1 RU, 19" [482mm] W x 8" [203mm] L x 1.75" [44mm] H; 7 lb [3.2kg] |
| Environmental | Convection cooled; Operating: 0 to 60 degrees C |
| Regulatory | North America: Designed to comply with FCC Class A, Part 15
Europe: LV Directive 73/23/EEC and EMC Directive 89/336/EEC; CE Mark [EN 55022 Class A, EN55024]; RoHS and WEEE compliant |
| Power Supply | Auto-sensing 100-240V, 50-60Hz |
| Notes | [1] Audio measurement made using a 0dBfs 1kHz sine wave sampled at 48kHz, 20-20kHz A-weighted |
