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Summary of Contents for Linear Acoustic LQ-1000
- Page 1 LQ-1000 Loudness Quality Monitor With Full-Color Loudness Speedometer™ Plus ITU-R BS.1770-1 and EBU R128 Support and Optional Dolby® Digital/Plus/E Decoding User Guide...
- Page 3 LQ-1000 Loudness Quality Monitor With Full-Color Loudness Speedometer™ Plus ITU-R BS.1770-1 and EBU R128 Support and Optional Dolby® Digital/Plus/E Decoding User Guide Release Date: February, 2011 Software Version: 1.00.05 and later Linear Acoustic Inc. Phone: 717-735-3611 FAX: 717-735-3612 Web: www.LinearAcoustic.com...
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Page 4: Warranty Information
Linear Acoustic or its agents have been advised, orally or in writing, of the possibility of such damages. This product contains Audyne technologies and is manufactured under license. -
Page 5: Table Of Contents
Linear Acoustic LQ-1000 User Guide Table of Contents List of Figures ............................vii Chapter 1: Introduction ........................5 Principles of Operation..................5 Reference Levels and Line Up Features..............6 Powering Up and Shutting Down................6 Reset and Upgrades ....................7 Warranty and Feedback ..................7 Chapter 2: Connections and Quick Setup ...............9... - Page 6 Linear Acoustic LQ-1000 User Guide Chapter 4: Detailed Operation ....................25 Main Menu Navigation ..................25 4.1.1 System Info Menu ................25 4.1.2 System Options..................26 4.1.3 Test Tones.....................29 4.1.4 GPI Setup....................30 4.1.5 Record Audio to USB................30 4.1.6 Time and Date Settings ...............30 Fullscreen Menu Navigation ................31 4.2.1...
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Page 7: List Of Figures
LQ-1000 Used for ingest of discrete audio channels ..............20 LQ-1000 Used for ingest of SDI embedded audio channels ............21 LQ-1000 used for decode of Dolby E audio and loudness measurement during ingest ..22 LQ-1000 used for live production ....................23 Locked Main Screen (left); Unlocked Main Screen (right) ............25 System Info menu ..........................26... - Page 8 Linear Acoustic LQ-1000 User Guide viii...
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Page 9: Chapter 1: Introduction
Optional built-in dual Dolby Digital/Dolby Digital Plus/Dolby E decoding Principles of Operation Figure 1-1 shows the internal audio path of the LQ-1000. It should be noted that this dia- gram is a general representation of signal flow. Please consult the appropriate section of... -
Page 10: Reference Levels And Line Up Features
Figure 1-1 Audio Block Diagram Reference Levels and Line Up Features The LQ-1000 is designed to support a standard reference level of -20dBFS via its digital inputs. The LQ-1000 Plus contains a host of built in signal generation capabilities that are useful for both level calibration of downstream equipment, and for channel identification. -
Page 11: Reset And Upgrades
Introduction Acoustic logo backlight will go off and the unit is now powered off. If there is a need to bypass the unit (LQ-1000 Plus), the best way is via Master Bypass in the System Settings menu. Reset and Upgrades To reset the unit, simply follow the power off procedure above, then power back on. - Page 12 Linear Acoustic LQ-1000 User Guide Introduction...
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Page 13: Chapter 2: Connections And Quick Setup
USB Thumb Drive for software updates • this manual, and a small piece of SWAG • Warranty information: Please fill out and return the warranty card to Linear Acoustic to ensure your software and documentation are kept up to date. Installation LQ-1000 installation requires: •... -
Page 14: Rear Panel
The rear panel of the LQ-1000 contains its electrical I/O. 2.3.1 Connection Ports All of the LQ-1000’s connections are on the rear panel and are described in detail below. See Chapter 6: Specifications for specific pinouts. Figure 2-1 Rear Panel •... -
Page 15: Quick Setup Notes
Permanent damage can occur! Quick Setup Notes The Linear Acoustic LQ-1000 is configured at the factory and is ready to go on the air after making the proper input and output connections and determining if upmixing is desired. -
Page 16: Password Programming
Password Programming After setup, users may wish to password-protect the LQ-1000. This will prevent unauthor- ized or accidental changes to the settings, however please do not forget the password! -
Page 17: Chapter 3: Applications And Use
Linear Acoustic LQ-1000 User Guide Chapter 3: Applications and Use The Linear Acoustic LQ-1000 Loudness Quality Meter was designed to provide all of the necessary metering tools to allow for proper loudness measurement and human-assisted control. To recap and expand on the features listed in Chapter 1: •... -
Page 18: Measuring Loudness
Linear Acoustic LQ-1000 User Guide Applications and Use Measuring Loudness Loudness measurement is decidedly different than simply measuring audio levels. This is because loudness involves human perception and the measurement will therefore not be objective, like voltage or current, but will instead be subjective. While the mechanics of how humans hear are fundamentally the same for each person, what they perceive can vary significantly. -
Page 19: Ebu Recommendation R128
Linear Acoustic LQ-1000 User Guide Applications and Use Figure 3-2 Responses of the pre-filter to account for acoustic effects of the head (left), and the RLB high-pass filter (right) combine to produce the so-called K-weighting filter. The final output of this system is Loudness, K-weighted, with respect to Full Scale, or dBLKFS. - Page 20 Linear Acoustic LQ-1000 User Guide Applications and Use Note that while some of the readings can be useful for continuous live metering, our early experience has shown that the best use of EBU mode is on a segment-by-segment basis where the meter is Started, Stopped, then reset for the next measurement.
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Page 21: Measurement With The Lq-1000
Applications and Use Measurement with the LQ-1000 After connecting signals to the LQ-1000 and ensuring that the clock is set appropriately (the “double-L” symbol should not be flashing red), measurements can begin. The most useful display is “Fullscreen Mode” where all measured details are displayed in one place. -
Page 22: Display Colors
Linear Acoustic LQ-1000 User Guide Applications and Use Figure 3-4 EBU Mode screen for channels 1-6 The input thumbnail meters are the same for EBU and ITU modes. The major difference is the large Integrated Measurement meter which shows loudness *relative* to -23LUFS (LKFS) and the scale is in Loudness Units (LU). -
Page 23: Scaling With The Lq-1000
Likewise, the colors of the LQ-1000 vary from green through yellow to red (too loud) more quickly than they fall from green to blue (too quiet). -
Page 24: Application Examples
Headphones Server – Discrete Audio Figure 3-6 LQ-1000 Used for ingest of discrete audio channels As shown above, discrete audio can be played back from tape, monitored for proper qual- ity and loudness level, and manual adjustment of the content can be performed as it is cap-... -
Page 25: Discrete Baseband Sdi
Similar to Figure 3-5, SDI audio can be played back from tape, monitored for proper qual- ity and loudness level, and manual adjustment of the content can be performed as it is cap- tured by the server or another tape machine. The LQ-1000 also simultaneously outputs the audio via AES for other applications. -
Page 26: Dolby E Decode To Baseband
Headphones Server – Discrete Audio Figure 3-8 LQ-1000 used for decode of Dolby E audio and loudness measurement during ingest The LQ-1000 can optionally contain a Dolby E/Dolby Digital decoder enabling it to re- place several pieces of equipment normally used during ingest. Audio can be decoded, checked for proper loudness, adjusted if necessary, then output as discrete or embedded. -
Page 27: Live Production
Shown in Figure 3-8 is a greatly simplified live application. The LQ-1000 is used to mea- sure the loudness of the live mix and feeds audio to a backhaul encoder (Linear Acoustic e-squared shown, but could be Dolby E). - Page 28 Linear Acoustic LQ-1000 User Guide Applications and Use...
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Page 29: Chapter 4: Detailed Operation
Linear Acoustic LQ-1000 User Guide Chapter 4: Detailed Operation This chapter discusses in detail the structure of the Linear Acoustic LQ-1000, how to use the front panel LCD interface to access the menus, accessing and saving factory and user processing presets, GPI and Metadata setup, and information about test tone generation features of the unit. -
Page 30: System Options
System Options The System Options menu provides the following functions: • Master Bypass – Relay bypass of Metadata and SDI inputs to outputs; with LQ-1000 Plus, also bypasses Digital Inputs to Digital Outputs • Metadata Bypass – Relay bypass of metadata input to metadata output •... - Page 31 Allows selection of any AES or SDI input. • Test Tones – See below • Clock Source – Select between the following (must be 48kHz): • External Reference (ONLY SUPPORTED BY LQ-1000 Plus) • AES Input 1 • • Internal 48kHz •...
- Page 32 USB device connected to the rear panel USB connector. When this de- vice is installed in an LQ-1000 unit and the system is power cycled, a startup message will prompt the user to allow restoring all settings of presets from USB.
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Page 33: Test Tones
4.1.3 Test Tones Test Tones – Multiple setup tones are available to calibrate the LQ-1000 and other down- stream equipment. The Level control is self-explanatory, and is set at the standard –20 dBFS reference level and adjusts the overall level of the test signals. On/Off turns the se- lected test signal on or off while Cycle determines which channels will reproduce the se- lected test signal. -
Page 34: Gpi Setup
4.1.4 GPI Setup The LQ-1000 supports four GPI inputs which can be controlled by contact closures via the rear-panel GPI/O connector or from the front panel F1-F4 keys which operate in par- allel with external inputs. Once the GPI functions are set and GPI is enabled, additional changes are not allowed until GPI is disabled. -
Page 35: Fullscreen Menu Navigation
Detailed Operation Fullscreen Menu Navigation The Fullscreen metering menu is likely where the LQ-1000 will be set during typical use. Since the majority of the screen is devoted to providing a clear indication of a number of parameters simultaneously, there is not much room left for menus. Then again, most... -
Page 36: Itu Meter Options
Linear Acoustic LQ-1000 User Guide Detailed Operation 4.2.2 ITU Meter Options: • Target Loudness - Sets static display of target and target marks over bargraph me- ters. Default is 24. • Input Gain - allows +/-24dB of gain to be applied to audio inputs •... -
Page 37: Ebu Meter Settings
Linear Acoustic LQ-1000 User Guide Detailed Operation • Reset Peak Hold - Resets the value shown in the numeric Peak indicator. • Screenshot to USB - Copies the current screen to a timestamped PNG file and stores it to an installed USB thumb drive. - Page 38 Linear Acoustic LQ-1000 User Guide Detailed Operation • Target Level - Adjusts a horizontal target line, used for display only • Averages - Sets the averaging for the RTA. Lower averaging results in a faster dis- play which is nice to look at but harder to use when calibrating low frequencies.
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Page 41: Chapter 5: Troubleshooting
Linear Acoustic LQ-1000 User Guide Chapter 5: Troubleshooting The Linear Acoustic LQ-1000 is a very stable and reliable unit, and most problems can be traced back to mis-wiring causing incorrect signals to be applied to the unit, or more than likely mis-configuration. -
Page 42: The "La" Symbol Is Flashing Red
5.1.2 The “LA” symbol is flashing red The small Linear Acoustic logo in the upper right corner of the display is used to indicate that the reference input is either missing or wildly incorrect. Check to make sure that an AES signal is connected to Main Input 1 or that there is an SDI signal present, then make sure the clock is set appropriately (see Chapter 4). -
Page 43: Chapter 6: Specifications
Linear Acoustic LQ-1000 User Guide Chapter 6: Specifications Table 6-1 Electrical Specifications Sampling Rate 32-96 kHz, 48kHz nominal (0.1%) Word Length 24-bits Measurement Algorithm ITU-R BS.1770-2 with EBU R128 support Four unbalanced female BNC connectors, comply with AES- Digital Audio In 3ID-2001/SMPTE 276M. - Page 44 Linear Acoustic LQ-1000 User Guide Specifications Table 6-2 Mechanical Specifications Dimensions 3.5 19 17 in (8.9 48.3 43.2 cm) Net Weight 10 lb (4.5 kg) approx. Shipping Weight 14 lb (6.4 kg) approx. Power Requirements 90-240 VAC, auto-sensing, 50–60 Hz...
- Page 45 Linear Acoustic LQ-1000 User Guide Specifications Metadata Input Port 9-pin female D-connector with full-duplex RS-485 protocol running at 115 kbps. Pinout is compatible with SMPTE 207M. Pin-for-pin compatible with Dolby metadata sources (i.e. straight-through cable should be used. Table 6-4 Metadata I/O Port Pinout...
- Page 46 Linear Acoustic LQ-1000 User Guide Specifications Table 6-5 GPI/O Parallel Control Port Pinout Function Function + 5 V (150 mA) + 5 V (150 mA) GPI A (Hold Low=On) Ground GPI B (Hold Low=On) Ground GPI C (Hold Low=On) Ground...
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