The number one complaint of television viewers is inconsistent audio loudness – “why are the commercials so loud.” These differences in audio levels between TV programs, or between programs and commercials, are a constant annoyance to viewers. DaySequerra’s second-generation loudness control, the NLC5.1ST, gives broadcasters a 1RU solution to maintain their desired loudness level across all audio programming and minimize viewer complaints.
DaySequerra NLC5.1ST measures and maintains desired audio loudness levels
simultaneously for 5.1 surround and stereo programs in a single rack space unit.
The NLC5.1ST 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 DaySequerra
NLC5.1ST then uses the proprietary DTS Neural Loudness Control, an advanced
loudness leveling algorithm, to apply 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. A
set of user-definable alarms can alert an operator of input loss, signal
clipping and high or low signal levels referenced to the desired loudness level.
An Ethernet interface provides long-term logging, email alerts and field
software updates capability.
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 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. The DaySequerra NLC5.1ST 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).
Four AES inputs are provided for simultaneous measurement for 5.1 surround and auxiliary stereo inputs. A set of user-definable alarms can alert an operator of input loss, signal clipping and high or low signal levels referenced to the desired loudness level. An Ethernet interface provides long-term logging, email alerts and field software updates capability.
When DaySequerra’s NLC5.1ST is used ahead of an AC3 (Dolby Digital) transmission, the target loudness level will also match the Dialnorm metadata information, thus providing consistent, enjoyable audio for all viewers.
Key Features of the NLC5.1ST
- Simultaneous measurement and loudness control for 5.1 surround and auxiliary stereo inputs to maintain desired loudness level across all audio programming
- Industry-standard ITU-R BS.1770/1 and DTS Neural Loudness Measure (NLM) measurement algorithms
- DTS Neural Loudness Control with proprietary look-ahead technology provides seamless, imperceptible gain transitions
- Easy-to-read numerical LKFS and Target readouts on vacuum fluorescent display; bargraph LED audio level meters
- Decodes and displays program metadata
- Ethernet interface for long-term logging, email alerts and field software updates
- Options include
LTRT output and redundant power supply
Applications for the DaySequerra NLC5.1ST include network and program ingest centers, satellite facilities; cable head-end facilities, turnaround uplinks, quality control, and post-production facilities.
Whether pre-screening content at an ingest point or controlling the loudness of a broadcast air-chain, the DaySequerra NLC5.1ST is your key to reduce viewers complaints and improve audience satisfaction.