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Overview: Before and After Loudness Processing

The Butterfly Meter™ displays your content pre and post loudness normalization - and it's an integrated part of the aNorm algorithm.

The innovative graph instantly gives you an overview of how and why the incoming audio is adjusted.

In other words, the sheer look of the meter is just as astonishing as it is intuitive and informative.

  • See How and Why Your Audio is Processed

    Instant Pre and Post Processing Overview at a Glance.

  • Four Measures. One View. Times Two.

    Pre/Post Sliding Loudness, Program Loudness, LRA & Short-Term Loudness.

  • A Match Made in Heaven

    The Butterfly Meter and The Radar Meter Complement Each Other Perfectly.

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Meter Combination Example 3

  1. Program Loudness

    The blue triangle on the left side indicates the Program Loudness level at any given time.

  2. Pre-Processing Loudness

    Loudness histogram of the input signal before processing, subject to the sliding window selected.

  3. Input

    The left side of the graph represents your input signal before any loudness processing is applied.

  4. Loudness Range

    The square brackets indicate the Loudness Range (LRA). The left bracket indicates the LRA of the signal before processing; the right bracket indicates the LRA after processing.

  5. Output

    The right side of the graph shows a loudness histogram post normalization and post processing.

  6. Program Loudness Target

    The blue triangle on the right side shows the Program Loudness of the processed signal. It should 'float' closely around the highlighted 'target line' (in this case -24).

  7. Post Processing Loudness

    Loudness histogram of the input signal after processing, subject to the sliding window selected.

  8. Time Since Last Reset

    Shows the time since your last measurement reset.

  9. Short-Term Loudness

    The bargraph meters display short-term loudness before and after processing. Just right for checking e.g. dialog level.

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A Match Made in Heaven

The Butterfly Meter is not meant as a substitute or a replacement for our legendary Radar Meter. In fact, the two complement each other perfectly as they are created for two very different tasks: the Radar Meter shows loudness history with critical details in a single view and the Butterfly Meter is your processing meter, focusing on loudness pre and post processing.

In the chart below, you can get an overview of the key differences between the Radar Meter and the Butterfly Meter.

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by Rob James

In action the process is surprisingly transparent. I tried it with a variety of material, some quite challenging and I would have been happy to transmit everything I heard. The new Butterfly meter gives an intuitive overview of the audio pre and post loudness normalisation. aNorm running on a DB6 is a well executed answer to a problem that is or will be faced by most broadcasters.

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The Butterfly Meter: Part of aNorm

The Butterfly Meter is an integrated part of the aNorm algorithm, which is not just A new norm - it's THE new norm for loudness processing.

Learn More About aNorm

Keeping You Up To Date

We have been listened to by those actively setting broadcast standards - we've even donated our technology to many of the same international bodies that impact your broadcast work.

Legislation on loudness in television is constantly evolving. However, regardless of your location and no matter which TC Electronic Loudness units you use, we will always help you remain compliant with the latest revision of the broadcast standard that impacts your work.

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ITU BS.1770

Defined by The International Telecommunication Union , the ITU BS.1770 recommendation is global and one of the most important broadcast standards as many other standards are based on it.

Our broadcast products supports all revisions of BS.1770, including the latest BS.1770-3.

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EBU R128

The P/LOUD group, which is part of The European Broadcasting Union (EBU), has defined the R128 standard that applies to many European countries.

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ATSC A/85 is specified by The Advanced Television Systems Committee (ATSC) and applies to US broadcasters. A/85 is rooted in BS.1770 Loudness and True-peak level and uses LKFS as loudness unit.

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Defined by the Association of Radio and Television Businesses (ARIB), TR-B32 is a Japanese broadcast standard that builds on ITU BS.1770-2.

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Operational practice by FreeTV, Australia, OP-59 is rooted in BS.1770 Loudness and True-peak level and recommends a speech based as well as a universal approach to audio normalization.

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Loudness Website

Keeping track of the multitude of issues around loudness can be a challenge. That's why we've created a one-stop dedicated loudness website where you'll find critical information on the most important issues.

The site is an answer to the highly relevant question: "What Is Loudness, and Why Is It Important?"

Visit Loudness Website

Broadcast & Production Sales Team

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