TC Electronic LM2 User Manual
  1. Manuals
  2. Brands
  3. TC Electronic Manuals
  4. Measuring Instruments
  5. LM2
  6. User manual
TC Electronic LM2 User Manual

TC Electronic LM2 User Manual

Stereo loudness meter
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
USER'S MANUAL
English version
LM2
STEREO LOUDNESS METER

Advertisement

Table of Contents
loading

Related Manuals for TC Electronic LM2

Summary of Contents for TC Electronic LM2

  • Page 1 USER’S MANUAL English version STEREO LOUDNESS METER...

  • Page 3: Table Of Contents

    Tec h n ic a l S pe c i fic at i o n s ......4 5 TC Electronic, Sindalsvej 34, DK-8240 Risskov – tcdk@tcelectronic.com English Version Manual revision 1.11...

  • Page 4: Introduction

    LM2 is part of a universal and globally standardized loudness control concept, whereby audio may easily and consistently be measured and controlled at various stages of production and distribution. LM2 works coherently together with other TC equipment, or with equipment of other brands adhering to the same loudness standards.
  • Page 5 Analog. Digital I/Os are fully synchronous while analog I/Os are scaled in the analog domain for max utilization of converter dynamic range. Analog inputs can even be trimmed at 0.01 dB precision. LM2 may connect via USB to PC or Mac for...
  • Page 6 24/7 Logging As a standard feature LM2 comes with hindsight: the radar can show the past 24 hours, but LM2 actually includes so much memory of its own that you can take a detailed look one week back in time, even if it has had no connection to a computer.
  • Page 7 LM2 can also co-exist with PPM meters, VU meters or Dolby’s LM100 meter. LM2 greatly increases the usability of LM100 in production and transmission because it provides useful running status, and gives a standardized indication of much...

  • Page 8: Quick Guide

    Production and Live Meter LM2 lets you “mix by numbers” by only looking at the 2. Press the Recall key and use the dial to find an numbers on its LCD display. For a detailed radar view, “Ingest”...
  • Page 9 Stats page by pushing the Home key. Master Control Limiting On top of 24/7 logging, LM2 can be used as a precision true-peak limiter. Dump log files to a PC or a Mac or bring up the Radar view using the Icon application. Note...

  • Page 10: Operating Lm2

    A PCMCIA card can be used for backing up settings and 48 kHz lock is indicated with a green LED for system updates. LM2 handles PCMCIA cards from 44.1 kHz lock is indicated with a yellow LED, - as this is 512 kb to 2 MB.
  • Page 11 Target level. Once a program has been measured, press the Set Gain key to have LM2 automatically apply the 7 - HOME key static gain required to make the program arrive precisely at Target level.

  • Page 12: R Ear P A N E

    Power Switch Output & AES3id 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 logging data from the LM2 unit to a Mac or PC.

  • Page 13: T He Dis Pl A Y - Home P A G

    The HOME page is the default operation page and the Regardless of which descriptors are shown on the page LM2 defaults to from several of the sub-menus, Home page, they are all updated and available on when left untouched for 30 seconds.

  • Page 14: I/O Page.

    Set Gain may be disabled on the I/O page. Only Factory “Ingest” presets have the function enabled. Start of a new measurement When LM2’s meter is reset by pressing Home and Pause, Example instead of numbers it shows “-” markings in the display.

  • Page 15: E D It P A G

    EDIT pages, press EDIT or HOME - or press e.g. UTILITY or I/O keys to navigate directly to those menus. LM2 automatically returns to the Home page after 30 sec if no key has been touched. Parameters and settings...
  • Page 16 HDTV and digital radio: Stay below LRA of 20 LU. SDTV: Stay below LRA of 12 LU. Loudness measurements in LM2 are all rooted in ITU-R Mobile TV and car radio: Stay below LRA of 8 LU. BS.1770-2. However, subtle differences exist between different regions of the world.
  • Page 17 It affects a number of functions and displays in width of the sliding window may be defined. For typical LM2, and must be set according to the standard you broadcast production, a starting point between 6 and 15 need to comply with.
  • Page 18 EdIT PAgE 3. Target defines the “12 o’clock” value of the Radar influences Program Loudness, and not Sliding Loudness meter when LM2 is connected to a Mac or a PC running or Loudness Max. the Icon application. BS.1770-2 This setting reflects the latest revision of ITU-R BS.1770.
  • Page 19 Limiter Threshold Range: -18 dB to off Profiles: Dynamic, AC3 Codec, Universal, Loud, Voice. LM2’s limiter employs a look-ahead delay of 0.6 ms and The adaptive Profiles allow you to tell The Limiter what complies with ITU-R BS.1770-2 true-peak specifications.

  • Page 20: I / O P A G

    I/O page 2, place cursor at the parameter in the bottom of the display and press the CURSOR DOWN key to exit the EDIT pages, press EDIT - or press UTILITY or EDIT keys to navigate directly to those menus. LM2 automatically returns to the Main page after 30 sec if no key has been touched. Page 2...

  • Page 21: Utility Page

    LM2. Used for this purpose, there Input Source: AES (48 kHz) should be only a couple of dB more headroom in LM2 Clock Select: Digital in. than in the active speaker. The headroom adjustment should be done with the Ana Fader parameter set to 0.0...

  • Page 22: Ut Ilit Y Pa G

    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 during preset recall, and below the preset title if you recall using the Icon application. The auto function inserts the word “Meter”...

  • Page 23: St At S Pa G

    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: Pr Es E T H An D L In

    Factory presets, User presets and PCMCIA presets may Presets can be stored in any of the 99 user locations and be recalled from LM2’s front panel, or using the Icon presets can be named individually. Navigate using the application. The User preset bank may be copied to a UP/DOWN keys and the encoder.
  • Page 25 PAgE HEAd All functions of LM2 work perfectly without a Mac or PC, but it may project more details on a computer display. Connect a Mac, a PC or TC Icon MKII via USB to gain access to the unique radar loudness meter. If a connection is established this way at least once per week, you may dump a detailed log covering full 24/7 operation.
  • Page 26 Store page and a keyboard display will open. • • Press the large LM2 key referring to the LM2 unit you wish to access. • TC Icon now retrieves data from the LM2. •...

  • Page 27: Tc Icon

    TC ICON Store To store a preset: • Select Store • Rename Preset by pressing Preset Name • Select location • Then press STORE PRESET 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 Store page Delete Library Pages...
  • Page 28 User bank either to your hard disk or to a PCMCIA card. From Bank In this area you select which LM2 preset bank you wish to copy from. From File If you have already stored banks on your computer this is where these files will appear.
  • Page 29 LM2 & TC ICON Main page The parameters on the Main page are described previously in the manual.
  • Page 30 LM2 & TC ICON Setup page Momentary Range “X” key, or changing the Time Reference, resets the meter and descriptor history. Sets the range of the outer ring in the Radar meter. Select between EBU +9 dB or EBU +18 dB.
  • Page 31 LM2 & TC ICON or changing the Time Reference, resets the meter and descriptor history. Low Level Below Determines where the shift between green and blue happens in the outer ring. It indicates to the engineer that level is now at risk of being below the noise floor.
  • Page 32 TC ICON & LM2 Stats Page 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 meters and the log file.
  • Page 33 LM2 & TC ICON Radar Page Target Loudness is displayed at 12 o’clock of the outer ring, and at the bold, concentric circle of the radar. The Universal Descriptors, Consistency and Center of Gravity, are the yellow numbers in the lower part of the display. Press RESET to reset Radar and Descriptors.
  • Page 34 Please notice that the meter will be reset and the history/log-file is deleted in the following situations. Power on off - turning of the LM2, Either from the front or the back, will reset the meter. Reset - resetting the meter from the front by holding HOME and...
  • Page 35 USINg MULTIPLE LM2’S Up to 8 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 convenient tracking of each...

  • Page 36: L Oggi N

    Device ID Several LM2 units can be controlled via a single Icon Editor. Consider the Device ID as a label for the LM2. Per default the Device ID is the LM2 units serial number. The Device ID is clearly indicated in the logging file and typical use could be using this ID to refer to the processed signal - e.g.
  • Page 37 FULL reboot of the PC try a FULL power OFF/ON, using the physical on/ off switch on the back of LM2. Wait 10 seconds from OFF to ON. Note that you loose the Loudness Log File stored in the unit during this operation.
  • Page 38 LOggINg 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 see. Example:...

  • Page 39: S Et U P E X A M P Le S - P Ro D U C Ti O

    SETUP ExAMPLES - PROdUCTION Fig 1 Stand-alone Production meter for “mixing by numbers”. Use a preset from the Meter bank. Fig 2 Production meter extended with Radar. Use a preset from the Meter bank.
  • Page 40 SETUP ExAMPLES - PROdUCTION 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 preset from the Meter bank.

  • Page 41: S Et U P E X A M P Le S - In G E S

    SETUP ExAMPLES - INgEST 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 Ingest Cal. Mon. bank.

  • Page 42: S Et U P E X A M P Le S - Ma S Te R Co N T Ro

    SETUP ExAMPLES - MASTER CONTROL Fig 7 Meter with logging of platform output at Master Control. Open the Icon application for a detailed Radar view covering the past 24 hours. Connect a computer once per week to dump logging file. Use a preset from the Meter bank.

  • Page 43: S Et U P E X A M P Le S - Lo G G I N

    SETUP ExAMPLES - LOggINg Fig 9 Gather logs from strategical consumer locations post transmission and post distribution.

  • Page 44: S Ign A L F Lo W D Ia G Ra

    SIgNAL fLOw dIAgRAM...

  • Page 45: Tec H N Ic A L S Pe C I Fic At I O N

    TECHNICAL SPECIfICATIONS Digital Inputs and Outputs XLR (AES/EBU) Connectors: RCA Phono (S/PDIF) Complies with: EN 55103-1 and EN 55103-2 Optical (Tos-link, ADAT) FCC part 15, Class B Formats: AES/EBU (24 bit), Safety CISPR 22, Class B S/PDIF (24 bit), EIAJ CP-340, IEC 958, Certified to: IEC/EN/UL/CSA 60065, CSA FILE# 108093 EIAJ Optical (Tos-link),...

Table of Contents