DaySequerra - Loudness Metering/Measurement
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iLM8 5.1 Surround Loudness Meter.
iLM8 5.1 Surround Loudness Meter
Differences in audio levels between TV programs, or between programs and commercials, are a constant annoyance to viewers. DaySequerra’s iLM8 permits broadcasters to maintain their desired loudness level across all audio programming and minimize viewer complaints.
Key Features of the iLM8
- Standalone operation – no external encoder is required
- Eight input channels of PCM AES and optional HD-SDI inputs with channel mapping for all 16 embedded audio channels
- Any eight channels of de-multiplexed SDI audio can be routed to the AES outputs
- Industry-standard ITU-R BS.1770/1 and DTS Technologies Neural Loudness Measure (NLM) algorithms; simultaneous measurement for 5.1 surround and auxiliary stereo inputs
- Easy-to-read numerical Measured and Target readouts on vacuum fluorescent display; bargraph LED audio level meters
- Front panel headphone monitor
- Rear panel includes an alarm port as well as an Ethernet interface for long-term logging, email alerts and field software updates capability
DaySequerra’s iLM8 Intelligent Loudness Monitor measures perceived loudness of eight channels of program audio using the industry-standard ITU-R BS.1770/1 and DTS Neural Loudness Measure (NLM) algorithms. DTS’ proprietary NLM algorithm was developed by DTS after extensive research into human hearing and perceived loudness.
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 loudness of the audio programming.
The DTS NLM 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 iLM8 measures the perceived loudness of eight channels of program audio and displays the results in an easy-to-read numerical format with a moving average over time, eliminating the variations with engineers interpreting traditional VU or PPM indicators (neither of which can measure perceived loudness). Four AES inputs and one HD-SDI input (optional) are provided for simultaneous measurement for 5.1 surround and auxiliary stereo inputs. With the HD/SDI option, eight channels of de-multiplexed SDI audio can be routed to the AES outputs; channel mapping is provided for all 16 SDI audio channels.
To improve system reliability and up-time, the DaySequerra iLM8 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. The iLM8’s built-in high-performance headphone amplifier allows monitoring of any two user-selected outputs even in noisy background environments. An Ethernet interface provides long-term logging and field software updates capability.
Applications for the DaySequerra iLM8 include network and program ingest centers, satellite facilities; cable head-end facilities, turnaround uplinks, broadcast quality control, and post-production facilities.
Whether pre-screening content at an ingest point or keeping tabs on the output of a broadcast air-chain, the DaySequerra iLM8 is your key to reduce viewers complaints and improve audience satisfaction.
Technical Specification For iLM8 |
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| Inputs | 8 AES PCM channels (5.1 plus AUX 2.0) via four BNC connectors HD-SDI (SMPTE 292M/299M) on one BNC connector |
| Outputs | 8 AES PCM channels (5.1 plus AUX 2.0) via four BNC connectors HD-SDI passive loop-through |
| Loudness Algorithms | ITU-R BS.1770/1 Industry Standard Loudness Measurement DTS Neural Loudness Measure |
| Headphone Monitor | > 150mW max into 32Ω load, 3.5mm front panel TRS connector |
| AES Sample Rate | 48kHZ, 24-bit |
| Latency | < 4 msec |
| Dynamic Range | 140dB DR, any input to any output [1] |
| Ethernet | 10/100-BASE-T for remote logging and field software updates |
| Alarm Outputs | Opto-isolated DB-9 female connector |
| 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: 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 |
| Options | 01: HD/SDI I/O |
| Notes | [1] Audio measurement made using a 0dBfs 1kHz sine wave sampled at 48kHz, 20-20kHz A-weighted |
