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Loudness monitoring of programme levels is needed in radio and television broadcasting, as well as in audio post production.Traditional methods of measuring signal levels, such as the peak programme meter and VU meter, do not give the subjectively valid measure of loudness that many would argue is needed to optimise the listening experience when changing channels or swapping disks.
In a loudness meter implementing EBU Mode: Reference level = −23 LUFS = 0 LU A programme with an integrated loudness of −26 LUFS measures −3 LU in EBU Mode (i.e. is 3 LU quieter than the target level). LRA Loudness Range [8] A statistically determined value that describes the loudness variation (dynamics) of a programme.
Loudness units relative to full scale (LUFS) is a synonym for LKFS that was introduced in EBU R 128. [ 10 ] The EBU has suggested that the ITU should change the unit to LUFS, as LKFS does not comply with scientific naming conventions and is not in line with the standard set out in ISO 80000-8.
Michael L. Dorrough (born January 1942), American inventor and audio engineer regarded as the “father of multi-band processing.” He is the founder of Dorrough Electronics and inventor of the Discriminate Audio Processor (DAP) in 1973, and the Dorrough Loudness Monitor.
Loudness levels measured according to the Leq(RLB) specified in ITU-R BS.1770 are reported in LKFS units. The ITU-R BS.1770 measurement system was improved for made multi-channel applications (monaural to 5.1 surround sound). To make the loudness metric cross-genre friendly, a relative measurement gate was added. This work was carried out in ...
Newer types of meter do, and there is now a push within the broadcasting industry to move away from the traditional level meters in this article to two new types: loudness meters based on EBU Tech. 3341 and oversampling true PPMs. The former would be used to standardise broadcast loudness to −23 LUFS and the latter to prevent digital clipping ...
However, the reading from a sound level meter does not correlate well to human-perceived loudness, which is better measured by a loudness meter. Specific loudness is a compressive nonlinearity and varies at certain levels and at certain frequencies. These metrics can also be calculated in a number of different ways. [4] [example needed]
This convention is the basis for the ITU's LUFS loudness unit, [23] and is also used in Sound Forge [10] and Euphonix meters, [24] and Analog Devices digital microphone specs [25] (though referred to as "dBFS").
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