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| Loudness Summit, Osaka |
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Hideo Irimajiri introducing the ARIB loudness standard TR-B32, based upon 1770-02 using VisLM-H, Osaka, Japan
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| Loudness Seminar, Japan |
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NUGEN Audio metering used to demonstrate the benefits of Real-time Loudness Analysis in Japan
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| VisLM Loudness
Meter
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Broadcast
| Film | Mastering | Multi-Media |
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| VisLM-H |
VisLM
with history view (H) and data logging option |
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| VisLM-C |
VisLM
compact (C) |
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| LMB | Loudness Managemnet Batch processor | |
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Loudness
Standards, recommendations
and legislation - overview
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With the signing of the CALM act (Commercial Advertisement Loudness
Mitigation), it became law in the USA to ensure that the loudness of
advertisments is in keeping with general program content. It is a legal
requirement for broadcasters to measure loudness. Many other countries
have similar legislation already in place or in process.
Understanding the implications and requirements for the audio producer
and broadcaster can at first seem rather confusing, with many
individual institutions making new recommendations until it is
understood that almost all of these recomendations are based upon the
same standard ITU-R BS. 1770/1.
ITU-R
BS. 1770/1 is a recommendation that defines a method for
the calculation of 'loudness', and is the basis for most
regional localisations of loudness measurement including those in
America (ATSC), Europe (EBU), Japan (ARIB) and many others (Brazil,
Australia etc.).
VisLM uses the ITU-R BS. 1770/1 standard.
ITU-R
BS. 1770-2 Revised to include the
relative gating methodology of EBU R128.
ITU-R BS. 1770-3
represents
the current version of the ITU standard. This revision updates the
definition of the True-peak measurement. NUGEN Audio loudness products
meet this specification.
ATSC
A/85 (Advanced Television Systems Committee) is the North
American recommendation referred to in the CALM act. and uses the ITU-R
BS. 1770 basis of measurement.
EBU
R128 (European broadcasting union) is
the European
recommendation, which takes the ITU R BS. 1770/1 measurement and adds
in a complex gating system to discount low level audio under certain
situations. VisLM is also capable of operating in 'EBU mode'. A
standard ITU-R BS. 1770/1 meter may not necessarily have this option.
EBU R128 was updated in September 2011, adopting the G10 gate of ITU-R
BS. 1770-2.
OP-59 (Australia) Based on ITU R BS 1770-3, using a target loudness of -24 LKFS.
Other specific national localisations generally require one of the
above methods of measurement as a basis for loudness measurement and
control.
Loudness Solutions | VisLM
product page |
LMB
Product page
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Delivery requirements
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Delivery requirements of various organisations and companies vary
greatly, although all require measurement of loudness to
ITU/ATSC/EBU standards.
LKFS
and LUFS. LKFS is the unit of measurement when using ITU-R
BS. 1770/1 in it's original form. LUFS is the unit of measurement when
using the EBU R128 measurement.
Many delivery documents simply require the basic criteria as laid out
in the chosen recommendation directly (eg. -24LKFS integrated loudness
or -23 LUFS integrated loudness). In addition to this, some specify
methods of choosing typical 'anchor' audio sections for
measurement, maximum short-term loudness levels, preferred loudness
ranges (LRA) etc. or require slightly more conservative integrated
loudness values.
Loudness Solutions |
VisLM
product page |
LMB
Product page
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| Calibration and test tones
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Whilst VisLM needs no specific calibration or set-up when used with-in
a DAW , in situations where external audio paths are used to transfer
audio to the host machine, it can be useful to check that the signal
path is transmitting the data without accidental filtering or
attenuation.
Both the ITU and EBU provide test
tone specifications for checking meter compliance, calibration
and
set-up and these are listed below.
Loudness Solutions | VisLM
product page |
LMB
Product page
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| ITU-R BS.
1770/1 Test Tone |
If a 0 dB FS 1 kHz
sine wave is input to the left, centre, or right channel input,
the indicated loudness will equal –3.01 LKFS |
| EBU Tech Doc 3341 (EBU R128 meter) |
| Test
Case |
Test
signal |
Expected
response and accepted tolerances |
| 1 |
Stereo sine wave, 1000 Hz,
-23.0 dBFS (per-channel peak level); signal applied in phase to both
channels simultaneous; 20 s duration |
M, S, I = -23.0 ±0.1 LUFS M, S,
I = 0.0 ±0.1 LU |
| 2 |
As #1 at -33.0 dBFS |
M, S, I = -33.0 ±0.1 LUFS M, S,
I = -10.0 ±0.1 LU |
| 3 |
As #1, preceded by 20 s of -40
dBFS stereo sine wave, and followed by 20 s of -40 dBFS stereo sine wave |
I = -23.0 ±0.1 LUFS I = 0.0
±0.1 LU |
| 4 |
As #3, preceded by 20 s of -75
dBFS stereo sine wave, and followed by 20 s of -75 dBFS stereo sine wave |
I = -23.0 ±0.1 LUFS I = 0.0
±0.1 LU |
| 5 |
As #3, but with the levels of
the 3 tones at -26 dBFS, -20 dBFS and -26 dBFS, respectively |
I = -23.0 ±0.1 LUFS I = 0.0
±0.1 LU |
| 6 |
5.0 channel sine wave, 1000 Hz,
20 s duration, with per-channel peak levels as follows:
-28.0 dBFS in L and R -24.0 dBFS in C -30.0 dBFS in Ls and Rs |
I = -23.0 ±0.1 LUFS I = 0.0
±0.1 LU |
|
|
| VisLM Loudness
Meter
|
Broadcast
| Film | Mastering | Multi-Media |
|
|
|
|
| VisLM-H |
VisLM
with history view (H) and data logging option |
|
| VisLM-C |
VisLM
compact (C) |
|
| LMB | Loudness Management Batch processor | |
|
| |
|
| Save on VisLM |
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Huge savings of up to 30% with our attractive product bundles. more...
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| System Requirements |
Monofilter is available in RTAS, VST and AU formats for PC and Mac
(universal
binary)
Mac OSX 10.4.x, G4 1.4 GHz or Intel® Core™ Duo 1.66 GHz, 512 MB RAM
Windows XP or Windows Vista, Pentium 1.4 GHz, 512 MB RAM
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| NuGen Studio |
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A complete solution for the
control and enhancement of your spatial image and our comprehensive
audio analysis software. more...
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