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Linear Acoustic LQ-1000 User Guide

vii

List of Figures

1-1

Audio Block Diagram .........................................................................................................................6

2-1

Rear Panel ...........................................................................................................................................10

3-1

Block diagram of ITU-R BS.1770 multichannel loudness algorithm ........................................14

3-2

Responses of the pre-filter ................................................................................................................15

3-3

Fullscreen ITU mode display for channels 1-6 .............................................................................17

3-4

EBU Mode screen for channels 1-6 ................................................................................................18

3-5

Comfort Zone (from Riedmiller, et. al.) .........................................................................................19

3-6

LQ-1000 Used for ingest of discrete audio channels ...................................................................20

3-7

LQ-1000 Used for ingest of SDI embedded audio channels ......................................................21

3-8

LQ-1000 used for decode of Dolby E audio and loudness measurement during ingest .......22

3-9

LQ-1000 used for live production ..................................................................................................23

4-1

Locked Main Screen (left); Unlocked Main Screen (right) ..........................................................25

4-2

System Info menu ..............................................................................................................................26

4-3

System Options menu (left) and Preferences menu (right). ........................................................29

4-4

Top of Fullscreen Mode screen........................................................................................................31

Содержание LQ-1000

Страница 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...

Страница 2: ......

Страница 3: ...ss 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 7...

Страница 4: ...HIPPING MATERIALS LIMITATION OF PERIOD OF ACTION ON CONTRACT No action regardless of form arising out of the transactions under this agreement may be brought by buyer its successors agents and or assi...

Страница 5: ...1 Unpacking and Inspection 9 2 2 Installation 9 2 3 Rear Panel 10 2 3 1 Connection Ports 10 2 4 Quick Setup Notes 11 2 5 Password Programming 12 Chapter 3 Applications and Use 13 3 1 Measuring Loudne...

Страница 6: ...gs 30 4 2 Fullscreen Menu Navigation 31 4 2 1 Fullscreen Mode Adjustments 31 4 2 2 ITU Meter Options 32 4 2 3 EBU Meter Settings 33 4 2 4 RTA Options 33 Chapter 5 Troubleshooting 37 5 1 Problems and P...

Страница 7: ...hannels 1 6 18 3 5 Comfort Zone from Riedmiller et al 19 3 6 LQ 1000 Used for ingest of discrete audio channels 20 3 7 LQ 1000 Used for ingest of SDI embedded audio channels 21 3 8 LQ 1000 used for de...

Страница 8: ...Linear Acoustic LQ 1000 User Guide viii...

Страница 9: ...nd Loudness Range LRA Quad meter engines for simultaneous measurement of 5 1 2 ITU and EBU NEW Session and 7 5 day Weekly logging with results in graphable CSV format Oscilloscope and third sixth octa...

Страница 10: ...lluminate first and the unit will then begin booting Shutting down is exactly the same press the Left Up and Right buttons The screen will show the shutdown sequence then will then go blank A few seco...

Страница 11: ...ed with the unit WARNING Do not connect any devices other than the supplied USB thumb drive to the USB connector on the rear panel without specific instructions from the factory 1 5 Warranty and Feedb...

Страница 12: ...Linear Acoustic LQ 1000 User Guide Introduction 8...

Страница 13: ...power cords style matches country of order 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 Acoust...

Страница 14: ...onfiguration as the inputs on 1 6 The output of the extra stereo 2 program is avail able on 7 8 or a compatible LtRt downmix of the main program can be selected Metadata I O RS 485 connection accepts...

Страница 15: ...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 Select appropriate reference from the Syste...

Страница 16: ...and a copy of the menu tree There are many different ways to use this flexible unit and the menu system will quickly become familiar with just a bit of use 2 5 Password Programming After setup users...

Страница 17: ...U R128 metering with relative gating and Loudness Range LRA Quad meter engines for simultaneous measurement of 5 1 2 ITU and EBU NEW Session and 7 5 day Weekly logging with results in graphable CSV fo...

Страница 18: ...e a better and more universal answer to the question of how to objectively measure loudness The result was published as ITU R BS 1770 and essentially specifies a system that filters weights then power...

Страница 19: ...useless because the resulting measurement varies too much and eyeball interpretation is once again required Longer integration times settle the measurement down and produce a value that correlates be...

Страница 20: ...Display of Loudness Range LRA Measures the variation of loudness on a macroscopic time scale Difference between low 10th and high 95th percentile loudness distribution Display of low 10th High 95th an...

Страница 21: ...ons press the Left Back button then press the Up button to return to the top which shows Display XXX The menu tree is helpful here Then make sure that the desired meter is being displayed Display 5 1...

Страница 22: ...th a 400msec integration the middle is Short term with a 3 second integration and the bottom is Integrated with an infinite integration and the relative gate applied This meter is simply a graphical i...

Страница 23: ...scale content quickly and easily Up to 24dB of cut or boost can be applied to the audio prior to metering and output This can be done manually by watching the meter and adjusting the gain once conten...

Страница 24: ...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...

Страница 25: ...k 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 simultaneou...

Страница 26: ...e 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 The auto sensing capabilities of th...

Страница 27: ...tion since these two parts are separate functions 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 backhau...

Страница 28: ...Linear Acoustic LQ 1000 User Guide Applications and Use 24...

Страница 29: ...k out towards the Main menu The menus and submenus are structured to access more complex func tionality as you go deeper into the hierarchy See page 31 for a menu tree The left side of Figure 4 1 show...

Страница 30: ...samples Primary SR Average Sample Rate nominally 48 kHz LfRf Upmix Indicates whether upmixing is currently on or off not used in LQ Metadata Indicates current status of incoming metadata Options Disp...

Страница 31: ...Dolby E decoder SIMM mod ule 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...

Страница 32: ...ses OLED display Reinitialize Fast reset of the system software and audio drivers Save Settings Immediately Changes to the system are automatically saved over a period of many minutes in order to mini...

Страница 33: ...s the se lected test signal on or off while Cycle determines which channels will reproduce the se lected test signal It can be adjusted to cycle through all channels all channels of just the main prog...

Страница 34: ...ve Note that this is currently intended for factory diagnosis of audio issues and requires a special player for proper re production With instructions from the factory 6 or 8 channels of input and or...

Страница 35: ...r status which allows selection and adjustment of parameters Available adjustment modes are Fullscreen Mode Meter Options and RTA Options Figure 4 4 Top of Fullscreen Mode screen showing current mode...

Страница 36: ...e Sets how long the peak meter will hold the last peak value De fault is 3 seconds Scroll Interval Sets how fast the histogram will scroll from left to right Note that it acts like a zoom control and...

Страница 37: ...eter and the target value as an offset to Input Gain i e the same number shown by the top right numerical readout Note that this can be done automatically by pressing the F3 front panel key when GPI i...

Страница 38: ...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 A typical value in the 20...

Страница 39: ...Line 9 VANC MD Async SDI Embed Opt SDI Outputs Opt Out 1 2 AES In 1 2 Out 15 16 SDI In 9 10 Clock Source SIMM Source AES1 Volume Speakers Headphones Change Password LCD Shutoff System Options Update S...

Страница 40: ...Linear Acoustic LQ 1000 User Guide Detailed Operation 36 This Page Nearly Blank...

Страница 41: ...the power switch off A less dramatic way to accomplish the same result is to access the System Options menu and enable Master Bypass If you are unsure of what is happening in a particular system simpl...

Страница 42: ...channel pairs Most often viewers watching in stereo will be the first to notice such problems Off sets as small as a couple of milliseconds may quickly become audible under the right con ditions 5 1...

Страница 43: ...ications Metadata Input Output RS 485 9 pin female D connector on rear panel GPIO Port TTL level 25 pin female D connector Ethernet RJ 45 female jack connector 10 1000 BASE T supports log ging and str...

Страница 44: ...8 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 Power Consumption 40 W maximum Operating Temperature 0o C to 50o C fa...

Страница 45: ...rnet Port Standard RJ 45 female connector that supports 10 to 1000BASE T GPI O Parallel Control Port TTL level controls active Low GPI A and B are held low to activate their assigned func tion while G...

Страница 46: ...mA 14 5 V 150 mA 2 GPI A Hold Low On 15 Ground 3 GPI B Hold Low On 16 Ground 4 GPI C Hold Low On 17 Ground 5 GPI D Hold Low On 18 Ground 6 RESERVED 19 Ground 7 RESERVED 20 Ground 8 RESERVED 21 Ground...

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