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TC SUPPORT INTERACTIVE TABLE OF CONTENTS The TC Support Interactive website www.tcsupport.tc is designed as an online support TABLE OF CONTENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 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 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Since 1998, TC has performed listening tests and evaluation of loudness models; and INTRODUCTION therefore holds an extensive, Universal Database of loudness, based on ten thousands LM5 and LM5D Radar Loudness Meter of assessments. The database covers all sorts of broadcast material, music, commercials, feature film and experimental sounds, and is verified against other LM5 represents a quantum leap away from simply measuring audio level to measuring independent studies. perceived loudness. The
ページ4に含まれる内容の要旨
ever decreasing dynamic range. By now, the pop music industry is “right of” In Flight BASIC USE Entertainment in the illustration. LM5 makes use of a unique way of visualizing short-term loudness, loudness history, LM5 offers a standardized option: The visualization of loudness history and DRT in and long-term statistical descriptors (LM5D only). It may be used with mono, stereo combination with long-term descriptors from production onwards, is a transparent and and 5.1 material for any type of
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RADAR PAGE LOUDNESS HISTORY: RADAR The Loudness Radar shows a history of loudness over time. The loudness “landscape” Current Loudness: Outer Ring may be used to judge if loudness emphasis is put where you want it to be: If dialog The outer ring of the Radar page displays current loudness. The 0 LU point (i.e. Target segments are balanced against action parts, if the chorus of a song has a lift against Loudness) is at 12 o’clock, and marked by the border between green and yellow, while the verse
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Universal Descriptors (LM5D only) not to measure programs of a shorter duration than approximately 10 seconds, while the maximum duration may be 24 hours or longer. Additional to the short-term loudness (outer ring) and loudness history (radar), LM5D displays long-term statistical descriptors that describe an entire program, film or Before a new measurement, press the “X” (Reset) key. This resets the descriptors, the music track. Unlike concepts that measure only dialog, LM5D may measure any typ
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The peak meters of LM5 display true-peak as specified in ITU-R BS.1770. True-peak PPM PAGE meters give a better indication of headroom and risk of distortion in downstream Press the “PPM” key to bring up the PPM display, Fig 6. The PPM page is used to equipment such as sample rate converters, data reduction systems and consumer inspect balance between channels, headroom, overload of channels etc. electronics than digital sample meters used e.g. in CD mastering. Fig 6, PPM True-peak meter feature
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Time Reference can take two values: “Actual Computer Time” or “Program Time”. The PREFERENCES PAGE first is synchronized to the realtime clock of the computer, the latter to when a new measure was started, i.e. when the “run” key was pressed. Note: The meter history resets when you switch between Time Reference settings. Radar Speed controls how long time each radar revolution takes. Select from 1 minute to 24 hours. You may “zoom” between the settings, as long as the history isn’t reset. Pressi
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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. You may store new presets with a ProTools session based on your own preferences. You may switch between presets on the fly without resetting the Radar, thereby easily changing scale, zoom etc. Broadcast HD 0 LU Equals: -22 LFS Low Level Below: -18 LU (Equals –40 LFS in this case). Radar Resolution: 6 dB per division True-peak Indicator: -6 dB
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Unlike electrical level, loudness is subjective, and listeners weigh its most important ITU-R BS.1770 PRIMER factors - SPL, Frequency contents and Duration - differently. In search of an ITU-R BS.1770 standardizes the measurement of long-term loudness and of true-peak “objective” loudness measure, a certain Between Listener Variability (BLV) and Within level. LM5 displays both parameters, and additionally offers a consistent way of Listener Variability (WLV) must be accepted, meaning that even l
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METER CALIBRATION Because of the frequency and channel weighting, and of the way channels sum, only specific tones and input channels should be used for calibration. The most transparent results are obtained using a 1 kHz sine tone for calibration. Other frequencies or types of signal may be used (square wave, noise etc.), but don’t expect similar results. The beauty of the system lies in its RMS foundation, so this is a feature, not an error. The same feature enables the loudness measure to ide
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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 PA systems, and to avoid annoying level jumps during commercial breaks in television. In Australia, something similar may happen. Many years of research into loudness of not only dialog, but also of loudness relating to any type of audio programming, has brought TC to the forefront of co
