Low Bitrate Digital Radio Loudness Processor LBR4 User Manual
Welcome Thanks for purchasing the DaySequerra LBR4. The Eclipse Loudness Measure algorithm and newly developed perceptual loudness control maintain broadcasters desired loudness while significantly reducing artifacts from lossy codecs and low-bit rate transmission. The four independent stereo processing chains make it perfect for multicasting.
Table of Contents Important Safety Information Service Information Technical Specifications Introduction Measuring Loudness Installation Front Panel Rear Panel Meter Display 4 4 5 6 7 11 12 13 14 Home Screen Menu Tree Programming Menu Presets Channel Configuration System Menu Faults Firmware Update Warranty Information 15 16 17 17 18 19 23 24 26 LBR4 Key Features • Four independent stereo processing chains – perfect for multicasting • Compatible with digi
Important Safety Information • • • • • • • • • Indoor use only. Not for use in wet or damp environments. Maximum Relative Humidity: <80% Class I Equipment (grounded type) Electrical rating: 100-120/220-240V~50-60Hz 25W max AC Mains supply voltage fluctuations are not to exceed +10% of the nominal voltage Operations temperature range -40°C to 70°C Maximum altitude: 3000m (9843ft) Equipment suitable for continuous operation Weight: 3.6kg (8lbs) equipment only; 6.1kg (13.
Technical Specifications Latency: <6ms Eclipse Algorithm Processing, plus <6ms for Hardware Interface 25W Maximum Rack Mount; 1 RU (1.75” x 19” x 8”) 32kHz and 96kHz Eclipse Loudness Measure Power Consumption: Dimensions: Sample Rate: Loudness Algorithms: Dynamic Range: GPIO: Regulatory: 140dB, DR any input to any output Opto-isolated DB-9 Female, 0-5V TTL North America: Designed to Comply with FCC Class A part 15 requirements.
Introduction DaySequerra’s LBR4 Intelligent Low Bit Rate Digital Loudness Processor measures and corrects perceived loudness of four stereo channels of program audio using the industry-standard ITU-R BS.1770/1 and Eclipse Loudness Measure algorithms. This proprietary algorithm was developed by after extensive research into human hearing and perceived loudness.
Measuring Loudness Human perception of the sensation of an audio signal is properly called “loudness”. As early as 1933, research by Fletcher and Munson showed that human hearing sensitivity is largely based upon the frequency of the sound, as well as the sound pressure level (SPL). As humans do not hear sound using standard measures of intensity, measuring loudness based upon SPL or the root mean square (RMS) voltage of the electrical signal will not agree with human perception.
Weighting Curves To achieve a more accurate loudness measurement, the method should include critical bands in the measurement. Critical bands describe auditory filters within the human cochlea. (J. Allen, 2010). To illustrate this, a subject is presented with a single tone of a certain energy level, and more tones are added with equal energy in the critical bands – the total signal energy is kept constant regardless of the number of tones.
Bronwyn Jones and Emil Torick created a revised CBS loudness meter in the early 1980s that consisted of eight filters, each covering three critical bands. This approach did prove to deliver better subjective modeling than traditional SPL or RMS measurements (Jones & Torick, 1982). In 2004, Nielsen and Skovenborg published an AES paper that expanded upon the ideas of critical band loudness measures.
Each Leq(x) revision results in a different level of correlation between the objective measure and the human listener’s assessment of loudness. The lowest mean error score was achieved by the Neural Loudness Measure Work Cited 1. Fletcher, H. & Munson, W. A. (1933). Loudness, its Definition, Measurement, and Calculation. 2. Allen, J (2010 May 20). Nonlinear Cochlear Signal Processing. 3. Johnston, J. (2006). Loudness Tutorial. 4. Jones, B. L. & Torick, E. L. (1982).
Installation Immediately upon receiving your LBR4, please make a careful inspection for any shipping damage. If damage is found or suspected, please notify the carrier at once and then contact your dealer. LBR4 is shipped in one carton, which contains: the LBR4 unit, an AC power cable, and the Quick Start Guide. We strongly encourage you to save the shipping carton and shipping materials supplied with your LBR4.
Front Panel Controls and Indicators 1. | 2. | 3. | 4. | -5. -6. -7. 1. Bargraph Meters • INPUT / OUTPUT LEVELS - Eight 10-segment multi-colored LED meters display the audio level for each channel of the inbound and outbound audio stream. 2.
Rear Panel AUDIO INPUT AND OUTPUT INTERFACE • Balanced Digital AES via DB-25 TASCAM format cable INPUTS • • 4 AES-3 PCM inputs for independent 2.0 stereo 1 AES-3 PCM input for EAS/CAP OUTPUTS • 4 AES-3 PCM outputs for independent 2.0 stereo GPIO – A Female DB-9 connection that allows Auto-Daypart to automatically change operating profiles. Opto-isolated inputs is triggered by a voltage of 5VDC Pin Signal 1 2 3 4 Output Relay 1 N.O.
Input 1: Toggles CH-1 processing mode sequentially between DAYPART AM and DAYPART PM. (DayPart GPI must be enabled) Input 2: Toggles CH-2 processing mode sequentially between DAYPART AM and DAYPART PM (DayPart GPI must be enabled) Input 3: Toggles CH-3 processing mode sequentially between DAYPART AM and DAYPART PM. (DayPart GPI must be enabled) Input 4: Toggles CH-4 processing mode sequentially between DAYPART AM and DAYPART PM.
Home Screen Figure 2. Home Screen on LBR4. The LBR4 Homescreen display should look similar to the one pictured in Figure 2. Each field is dynamic and will show the current status or configured settings. Pressing the HOME key again while in the Homescreen will enter the home screen selection mode, which allows for quick access to key functions by turning the ROTARY KNOB and pressing ENTER. 1. Displays the current channel. Channels 1 – 4 are selectable from this field. 2.
Menu Tree Figure 3. Visual Map of LBR4 Menu System.
Programming Menu If AC line power is lost or momentarily interrupted, LBR4 will revert to its previous state. To enter the programming menu, press the ENTER Key while at the HOMESCREEN. The ENTER key will then enter the selected sub menu or enter the value selection mode for the selected option. A press of the BACK key will navigate to the previous menu level or revert the current value to its last stored state. From the HOMESCREEN pressing HOME will highlight additional icons.
Channel Configuration Figure 6. Channel Configuration Menu Display CH-x Bit-Rate – 24 kbps, 32 kbps, 36, kbps, 48 kbps, 64 kbps and 96 kbps are selectable from this menu CH-x Processing – LBR4 is defaulted to process audio. Putting the LBR4 into Bypass mode will bypass the LBR4’s algorithm and copy the input signal to the output.
System Menu Figure 7. System Menu Screen Display Navigating to the SYSTEM SETTINGS MENU from the Main Menu will allow additional values to be adjusted in order to fine tune the operation of your LBR4. Clock Source Defines which channel to sync the clock to. (Channels 1, 2, 3, 4, or Internal) Sample Rate Displays the current sample rate for each channel (READ ONLY). If Internal is selected as a clock source 44.1 kHz and 48 kHz are available to select from.
EAS Override GPI and Auto Detect are selectable. GPI allows the user to trigger an EAS on CH-4 with a remote device. Selecting GPI Input 4 will copy the audio signal that is on CH-4 to all channels. Select again to stop the EAS and put all channels back into their normal state. If GPI is selected then EAS Detection and EAS Return Delay are not selectable by the user.
Diagnostics Figure 9. Diagnostics Menu Display Current Faults: Displays any error states that LBR4 may be in. DSP 1 Utilization: Shows the current load on LBR4’s main 6713 DSP. DSP 2 Utilization: Shows the current load on LBR4’s Secondary AudioExpress 6713 DSP. LED Test: Turns on all front-panel LED indicators to verify their functionality. Meter Brightness: Allows adjustment of LBR4’s Input and Output meters. (Default: 0) Display Brightness: Allows adjustment of LBR4’s display output.
Network Figure 10. Network Menu Display The DaySequerra Eclipse LBR4 has several configurable network settings. All of LBR4’s network settings are password protected. The password to change the network settings is ds123. Please take note when entering the password that the LBR4 password is case sensitive. The DaySequerra LBR4 is configured to take a DHCP address by default. Device Name: Allows you to change LBR4’s name as reported to DNS.
About Menu Model Number: Displays the model number of the unit. Serial Number: Displays the serial number of this unit. Hardware Rev: Displays the hardware revision level of this unit. Firmware Rev: Displays the firmware revision level that is running on this unit. Eclipse Algorithm: Displays the specific Eclipse algorithm running. Eclipse Algorithm Rev: Version of the Eclipse algorithm running on this unit.
Firmware Update Provided that you have completed warranty registration for your LBR4 on our website, we will notify you as new firmware updates become available. The notification will contain the announcement of new firmware, issues corrected, and instructions on how to retrieve the update files. Update packages will be available as a single .ZIP file for download. Compatible archive programs include Winzip (www.winzip.com) or WinRAR (www.rarlabs.com) and may be downloaded from their respective websites.
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DaySequerra – One Year Limited Warranty DaySequerra warrants this product to be free from defects in materials and workmanship to its original owner for one (1) year from the date of purchase. DaySequerra will repair or replace such product or part thereof that upon inspection by DaySequerra, is found to be defective in materials or workmanship subject to conditions contained herein. DaySequerra products are sold worldwide, through a network of authorized DaySequerra dealers and distributors.
LBR4 User Manual
