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TC Electronic LM2, User Manual

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Summary of Contents for LM2

Page 1: ...LM2 STEREO LOUDNESS METER USER S MANUAL English version...

Page 2: ......

Page 3: ...n 4 Quick guide 8 Operating LM2 10 Rear panel 12 The Display HOME page 13 The Display HOME page 14 Edit Page 15 I O Page 20 Utility page 22 Stats page 23 Preset handling 24 TC Icon LM2 25 Logging 36 S...

Page 4: ...easure and must be based on solid statistics Together with the academic community TC Electronic has therefore performed numerous listening tests and evaluation of loudness models Today the company hol...

Page 5: ...l meter for use in post and live production broadcast ingest linking and transmission Either check the numbers you need to comply with on LM2 s front panel or bring up the Stats display for even more...

Page 6: ...avoid output overload when positive gain normalization is required For fans of speech normalization allow LM2 to measure some regular dialog and normalize to that Otherwise let its relative gate funct...

Page 7: ...the same loudness measure for Production Delivery Specs Ingest Linking Master Control Processing Logging thereby ensuring better audio quality not only in DTV audio but across all broadcast platforms...

Page 8: ...info about the program may be found on the Stats page by pushing the Home key Measurements may be paused and reset using the keys next to the LCD display TC Electronic LM2 Walk This Way Getting start...

Page 9: ...ecall resets the meter history and the log 3 LM2 s default input is AES EBU Change input if needed using the I O key arrow keys and the dial 4 To lock LM2 s front panel from log reset and adjustments...

Page 10: ...t is currently selected in the I O menu 48 kHz and 44 1 A steady LED indicates the current sample rate If a digital input is the audio source and Clock Select is set to internal 44 1 or 48 kHz the LED...

Page 11: ...y presets with Ingest in their title have SET GAIN functions enabled 8 SET GAIN Additional to metering LM2 may perform static gain offsets in order for a program to comply with a certain Target level...

Page 12: ...V Power Switch USB COM IN OUT Through Optical SPDIF ADAT Note The USB connection may be used for parameter control and radar display via the Icon application This is also the interface used to dump lo...

Page 13: ...pends on your application For Post Production and Quality Control Program Loudness and Loudness Range are prime candidates For Live Production it is more informative to display Loudness Range alongsid...

Page 14: ...f the operator s choosing Reset Meter Press both the HOME and PAUSE buttons to reset metering The display briefly indicates reset Pause For easy reading at a specific time the metering can be paused b...

Page 15: ...if no key has been touched Parameters and settings Descriptor 1 Loudn Range Prog Loudn Sliding Loudn Loudn Max Off Descriptor 2 Sliding Loudness From 3 sec to 8 min Loudness Max 0 4 sec to 10 sec Lim...

Page 16: ...ess range they need but not more than they need Loudness Range may also be measured on a broadcast server to predict if a program is suitable for broadcast without further processing LRA is even a fin...

Page 17: ...to the descriptor title Loudness Max Loudness Max displays the maximum loudness registered since the meter was last reset Loudness Max is an especially useful parameter when checking and normalizing s...

Page 18: ...ter sets measurement gating Note that the parameter only influences Program Loudness and not Sliding Loudness or Loudness Max BS 1770 2 This setting reflects the latest revision of ITU R BS 1770 Relat...

Page 19: ...to have them at hand when called for by a specific application The Dynamic Profile offers gentle processing with minimum static and dynamic distortion It s a first choice for audiophile limiting for...

Page 20: ...Main page after 30 sec if no key has been touched The I O page is used for selecting I O formats clock conditions scaling of AD and DA converts disabling of the Set Gain function etc Note I O page pa...

Page 21: ...is to enable calibrated monitoring The setup of calibrated monitoring should be performed in this sequence 1 Scale the analog output using the Ana Out FS parameter 2 Feed a pink noise reference signal...

Page 22: ...adjust for trim in steps of 0 01 dB Auto Info Turn this function on to make LM2 automatically generate preset comments when stored The information is shown at the bottom of the front panel display dur...

Page 23: ...23 Stats page The Stats page provides an overview of key parameters Press the HOME key at any time to enter the Stats pages and see Program Loudness Loudness Max Loudness Range and True Peak Max...

Page 24: ...nd presets can be named individually Navigate using the UP DOWN keys and the encoder Press STORE to enter store mode Select Location where to store Select Mode Overwrite Delete Set Change name Mode Se...

Page 25: ...plication called setup exe is found on the supplied CD and latest version is always available for download via www tcelectronic com software Click on the setup exe file and follow the instructions THE...

Page 26: ...ted units and to which locations these are assigned Press the large LM2 key referring to the LM2 unit you wish to access TC Icon now retrieves data from the LM2 When ready you will see the Radar page...

Page 27: ...eset you wish to delete Press DELETE Consider this a Clean up function The preset is not stored by entering the name and pressing ENTER To actually store a preset the STORE key must be pressed on the...

Page 28: ...y the selected bank to To File Select To File if you wish to back up the selected bank to your hard disk The TC Icon saves the bank files in a specific location The location varies slightly between th...

Page 29: ...29 LM2 TC Icon Main page The parameters on the Main page are described previously in the manual...

Page 30: ...om between the settings as long as the history isn t reset Pressing the X key or changing the Time Reference resets the meter and descriptor history Radar resolution Sets the difference in loudness be...

Page 31: ...ity The Alert indicator is located on the Radar page and indicates suspected lack of stereo integrity based on measuring the difference of left right outputs If an average difference of 3 dB or more b...

Page 32: ...e The Stats page gives an overview of essential parameters Compared to the STATS page on the LM2 front the TC Icon Stats page also holds the Sliding Loudness parameter Note The Reset button resets the...

Page 33: ...aterial Press the Radar key to bring up the Radar page This page will probably be used most of the time Note The Reset button resets the meters and the log file Target Loudness is displayed at 12 o cl...

Page 34: ...meter Reset resetting the meter from the front by holding HOME and PAUSE pressed simultaneously or resetting the meter from the TC Icon Editor Set Gain activating the Set Gain function either from the...

Page 35: ...LM2 s can be conveniently controlled and monitored by a single TC Icon Editor You can switch between and access each frame via the Select page Log files can be stored in the same or different folders...

Page 36: ...lder Mac Users XX Documents TC Icon Data LM2 Presets where XX is the users name Device ID Several LM2 units can be controlled via a single Icon Editor Consider the Device ID as a label for the LM2 Per...

Page 37: ...of LM2 Wait 10 seconds from OFF to ON Note that you loose the Loudness Log File stored in the unit during this operation See also the previous page Meter Reset describing other situations invoking los...

Page 38: ...g You may prefer using Excels Line Chart function to view and analyze the data Select the range Loudness Data you want to see in a Line Chart Now select Insert Line and the type of line you want to se...

Page 39: ...39 Setup Examples Production Fig 2 Production meter extended with Radar Use a preset from the Meter bank Fig 1 Stand alone Production meter for mixing by numbers Use a preset from the Meter bank...

Page 40: ...ion 40 Fig 3 Calibrated stereo listening added to metering Use a preset from the Meter Cal Mon bank Fig 4 Calibrated listening for multiple sets of speakers and headphones added to metering Use a pres...

Page 41: ...gest Fig 5 Meter and gain normalize for broadcast Ingest and QC Use a preset from the Ingest bank Fig 6 Meter gain normalize and calibrated monitoring for broadcast Ingest and QC Use a preset from the...

Page 42: ...past 24 hours Connect a computer once per week to dump logging file Use a preset from the Meter bank Fig 8 Meter logging and precision limiting for platform output at Master Control Open the Icon app...

Page 43: ...43 43 Setup Examples Logging Fig 9 Gather logs from strategical consumer locations post transmission and post distribution...

Page 44: ...44 Signal Flow Diagram...

Page 45: ...dB 0 0018 1 kHz 6 dBFS FS 16 dBu 10 Hz to 20 kHz 0 0 2 dB 48 kHz 80 dB 10 Hz to 20 kHz typical 100 dB 1 kHz XLR balanced pin 2 hot 100 ohm active transformer 22 dBu balanced 10 dBu to 22 dBu 24 bit 6...

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