DaySequerra - Loudness Metering/Measurement
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Front View |
Rear View |
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iLM4ST Stereo Loudness Meter.
iLM4ST Stereo Loudness Meter
The DaySequerra iLM4ST Intelligent Stereo Loudness Monitor was designed to make it easier for radio and television broadcasters and cable networks to deliver an audio experience that won’t have viewers scanning stations or reaching for the mute button.
Current audio level meters measure the amplitude of the audio 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 iLM4ST simultaneously measures the perceived loudness of four stereo channels of audio using industry standard ITU-R BS.1770/1. Key features include:
- Industry-standard ITU-R BS.1770/1 algorithm
- Four AES3 stereo inputs; unbalanced on 75Ω BNC or optional balanced I/O on DB-25 TASCAM breakout cable
- Easy-to-read numerical Measured and Target readouts on vacuum fluorescent display; bar-graph LED audio level meters
- Front panel headphone monitor
- Rear panel includes GPIO port as well as an Ethernet interface for long-term logging, email alerts and field software updates capability
DTS Neural Loudness Measure (NLM) 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 more accurate perceived loudness measurement over time.
Technical Specification For iLM4ST |
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| Inputs | 4 AES PCM inputs for four stereo channels |
| Outputs | 4 AES PCM outputs for four stereo channels |
| Digital Inputs & Outputs |
75Ω, unbalanced BNC
Balanced digital AES via DB-25 TASCAM format with cable with option Pass-though AES outputs |
| 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 |
| Sample Rate | 32kHz to 96kHz |
| Latency | <22 msec |
| Dynamic Range | 104dB, DR any input to any output; 135dB, any input to any output [1] |
| Ethernet | 10/100-BASE-T for remote logging and field software updates |
| 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
EMI suppressed male IEC320 connector |
| Notes | [1] Audio measurement made using a 0dBfs 1kHz sine wave sampled at 48kHz, 20-20kHz A-weighted |
