Radar Loudness Meter with Universal Descriptors
Every day, millions of people adjust their level controls over and over. Why? Because of the most fundamental audio issue of all - the control of loudness. Rather than just measuring peak levels, LM5D combine frequency weighting with an energy-integrated measure of sound, or equivalent continuous sound level, abbreviated Leq. Broadcast has standardized on Leq(K) for measuring loudness, and for the balancing of programs.
Previous level control methods are responsible for unacceptable
level jumps in television, for music CDs getting increasingly
distorted, and for different audio formats and program genres
becoming incompatible: Pristine music tracks from the past don't
co-exist with new recordings, TV commercials don't fit drama,
classical music or film and broadcast doesn't match. The most
fundamental audio issue of all - control of loudness - every day
makes millions of people adjust the volume control over and over
Compliant with e.g. ITU-R BS.1770-2, EBU R128 and ATSC A/85, LM5D offers you a standardized and intuitively correct step forward. You can use these loudness radar meters for precise balancing and tight specification of any type of audio signal, and they cover both mono, stereo and 5.1 surround formats.
In a multi-platform world, it is also important that delivery
criteria can be easily specified and met even by people not
primarily concerned with audio. LM5D empowers the production
engineer/musician/journalist to visualize the loudness tolerance of
the consumer under different listening conditions. With
standardized loudness control in place in the studio, less level
correction is needed downstream, with better audio quality the
result. For platforms where range restriction is needed, audio
results are also improved because foreground and background
elements of a mix automatically retains their relative position.
LM5D consequently enables easy level management across distribution
and broadcast platforms without the need for extensive metadata
LM5D displays real-time Loudness (LU or LUFS) and True-peak level along with Loudness History (1 minute to 24 hours) in the Radar View. The angular, color-coded display makes it easy for you to balance audio visually, and to see when level falls below or exceeds the end-listener's Loudness Range Tolerance. The True-peak level display warns you when excessive level is at the risk of creating distortion in downstream equipment such as data reduction codecs or converters.
Further, LM5D adds two Universal Descriptors, by which the entire loudness 'landscape' of a program, film or music track can be precisely characterized. LM5D improves the quality of your audio and reduces level jumps on all distribution platforms from Mobile TV and iPod to HDTV using AAC or Dolby AC3, and work coherently together with TC equipment - as well as equipment of other brands adhering to the BS.1770-2 standard. More details may be found in the Tech Library.
Note: In the latest version of Dolby's LM100 meter, it has become BS.1770 compliant. It's descriptor, "Dialnorm", therefore also now complies with Center of Gravity in LM5D. Be sure to engage "All Sources", "All Channels" on LM100 to comply with BS.1770, and when comparing results between LM5D and LM100.
There are many aspects to loudness, and keeping track of all of them can be a challenge. Therefore, we have created a dedicated loudness website, where all of these aspects are outlined, explained and discussed.
The site is an answer to the highly relevant
"What Is Loudness, and Why Is It Important?"