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TC Electronic Loudness Radar Meter LM5 manual

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Table of contents for the manual

  • Page 1

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  • Page 2

    E E N N G G L L I I S S H H LM5 & LM5D -TDM / 1 E E N N G G L L I I S S H H TC SUPPORT INTERACTIVE The TC Support Interactive website www .tcsupport.tc is designed as an online support and information center . At the site you can find answers to specific questions regarding TC software and hardware. All known issues are stored in a database sea[...]

  • Page 3

    E E N N G G L L I I S S H H 2/ LM5 & LM5D -TDM LM5 & LM5D -TDM / 3 E E N N G G L L I I S S H H INTRODUCTION LM5 and LM5D Radar Loudness Meter LM5 represents a quantum leap away from simply measuring audio level to measuring perceived loudness. The old level method is responsible for unacceptable level jumps in television, for music CDs gett[...]

  • Page 4

    LM5 & LM5D -TDM / 5 E E N N G G L L I I S S H H E E N N G G L L I I S S H H 4/ LM5 & LM5D -TDM When production engineers realize the boundaries they should generally stay within, less dynamics processing is automatically needed during distribution, and the requirement for maintaining time-consuming metadata at a broadcast station is minimiz[...]

  • Page 5

    E E N N G G L L I I S S H H 6/ LM5 & LM5D -TDM LM5 & LM5D -TDM / 7 E E N N G G L L I I S S H H RADAR P AGE Current Loudness: Outer Ring The outer ring of the Radar page displays current loudness. The 0 LU point (i.e. T arget Loudness) is at 12 o’clock, and marked by the border between green and yellow , while the Low Level point is marked[...]

  • Page 6

    LM5 & LM5D -TDM / 9 E E N N G G L L I I S S H H not to measure programs of a shorter duration than approximately 10 seconds, while the maximum duration may be 24 hours or longer . Before a new measurement, press the “X” (Reset) key . This resets the descriptors, the radar and the true-peak meters. Run the audio, and watch the radar and desc[...]

  • Page 7

    PPM P AGE Press the “PPM” key to bring up the PPM display , Fig 6. The PPM page is used to inspect balance between channels, headroom, overload of channels etc. Fig 6, PPM T rue-peak meter features. Bargraph PPM meters are shown next to the round Current Loudness display , which is identical to the Outer Ring of the Radar page. The T rue-peak m[...]

  • Page 8

    PREFERENCES P AGE Fig 8, LM5 Prefs page. Preferences may be stored as Presets, thereby having suitable settings for different conditions easily at hand. Loudness Scale can be set to either “Loudness Units, LU” or “Loudness Full Scale, LFS”. Because LM5 uses the BS.1770 loudness model, LFS is the same as LKFS. When “LFS” is selected, the[...]

  • Page 9

    E E N N G G L L I I S S H H 14 / LM5 & LM5D -TDM LM5 & LM5D -TDM / 15 E E N N G G L L I I S S H H PRESETS The following presets have been loaded as factory defaults. Factory presets all use the LFS scale, Program time and 4 minutes per Radar Revolution. Y ou may store new presets with a ProT ools session based on your own preferences. Y ou [...]

  • Page 10

    E E N N G G L L I I S S H H 16 / LM5 & LM5D -TDM LM5 & LM5D -TDM / 17 E E N N G G L L I I S S H H Unlike electrical level, loudness is subjective, and listeners weigh its most important factors - SPL, Frequency contents and Duration - differently . In search of an “objective” loudness measure, a certain Between Listener Variability (BL [...]

  • Page 11

    E E N N G G L L I I S S H H 18 / LM5 & LM5D -TDM LM5 & LM5D -TDM / 19 E E N N G G L L I I S S H H Fig 11, Frequency weighting used with selected Leq measures. Red curve: A weighting. Green curve: RLB weighting. Blue curve: R2LB weighting, AKA “K” weighting. The frequency weighting employed in the loudness part of BS.1770 is shown in fig[...]

  • Page 12

    E E N N G G L L I I S S H H 20 / LM5 & LM5D -TDM POST SCRIPT Control of loudness is the only audio issue that has made It to the political agenda. Political regulation is currently being put into effect in Europe to prevent hearing damage and disturbances from P A systems, and to avoid annoying level jumps during commercial breaks in television[...]