Audio Normalization Techniques: Peak vs. Loudness

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Audio Normalization Techniques: Peak vs. Loudness

As an audio optimization expert, I’m often asked about the best techniques for normalizing audio levels. In this article, I will explore two popular approaches: peak normalization and loudness normalization. These techniques, peak vs. loudness normalization, have their own unique advantages and considerations. Let’s dive in and uncover the secrets of achieving balanced and consistent audio!

Peak Normalization: Unleashing the Power of Dynamics

When it comes to peak normalization, it’s all about preserving the dynamics of your audio. Imagine a breathtaking symphony where the crescendos and diminuendos transport you to a different realm. With peak normalization, you ensure that the highest peaks of your audio reach their full potential without clipping or distortion. It’s like giving your audio the freedom to express itself with intensity and impact.

Loudness Normalization: The Harmony of Consistency

Now, let’s turn our attention to the world of loudness normalization. Have you ever experienced the frustration of constantly adjusting the volume while switching between songs or TV shows? Loudness normalization comes to the rescue! By analyzing the perceived loudness of your audio, it ensures a consistent listening experience across different tracks. Say goodbye to sudden volume jumps and immerse yourself in a harmonious soundscape.

Dynamic Range: The Dance of Soft and Loud

In the realm of audio normalization, we encounter the concept of dynamic range. Dynamic range represents the difference between the softest and loudest parts of an audio signal. Peak normalization respects the natural dynamic range, allowing the delicate whispers and thunderous roars to coexist in perfect balance. On the other hand, loudness normalization aims to reduce the dynamic range, providing a more even playing field for all elements of your audio.

Audio Clipping: Taming the Wild Peaks

Audio clipping is a notorious villain that can ruin your audio experience. Picture this: a sudden burst of sound that distorts and crackles, disrupting your enjoyment. Peak normalization acts as the hero in this story, taming those wild peaks and ensuring that your audio stays within safe limits. With peak normalization, your audio remains clean and free from the dreaded clipping monster.

LUFS: The Measure of Perceived Loudness

In the realm of loudness normalization, we encounter the term LUFS, which stands for Loudness Units Full Scale. LUFS provides a standardized measure of the perceived loudness of your audio. Loudness normalization algorithms analyze the integrated LUFS value and adjust the overall volume to match a specific target level. It’s like having a universal translator that ensures consistent loudness across different tracks and platforms.

Listening Environment: From Living Rooms to Concert Halls

Let’s talk about the listening environment and its impact on audio normalization. Every space has its unique characteristics, from the cozy intimacy of a living room to the grandeur of a concert hall. Loudness normalization takes into account these variations, delivering a consistent listening experience regardless of the environment. So whether you’re enjoying your favorite tunes at home or attending a live performance, the magic of normalization will make every moment memorable.

Personal Preference: Customizing Your Audio Journey

We all have our individual tastes and preferences when it comes to audio. Some crave the raw power of peak normalization, while others seek the comfort of consistent loudness through loudness normalization. The beauty of audio normalization techniques is that they allow you to customize your audio journey according to your personal taste. It’s like having a tailor-made suit that perfectly fits your unique style.

Metadata and Replay Gain: Enhancing the User Experience

Metadata and Replay Gain are powerful allies in the realm of audio normalization. Metadata provides valuable information about your audio, guiding normalization algorithms to make the right adjustments. Replay Gain takes it a step further by applying metadata tags to your audio files, ensuring consistent playback volume across different tracks. Together, they create a seamless and enhanced user experience, elevating your audio enjoyment to new heights.

Compression: Controlling the Sonic Landscape

Dynamic audio content, such as movies or live performances, often presents challenges for normalization. This is where compression enters the scene. Compression techniques allow you to shape the sonic landscape, reducing the dynamic range while maintaining audio quality. It’s like having a skilled conductor who ensures that every instrument is heard clearly, regardless of its volume.

Audio Editing and Mastering: Polishing the Gems

Lastly, let’s not forget the crucial role of audio editing and mastering in the pursuit of sonic perfection. Audio professionals meticulously fine-tune various parameters during the editing and mastering process. Audio normalization techniques become valuable tools in their arsenal, ensuring that the final product shines with balanced and consistent audio. It’s like adding the final touch of brilliance to your audio gems.

In conclusion, the choice between peak normalization and loudness normalization depends on your desired audio outcome. Whether you embrace the dynamic range or seek consistent loudness, these techniques empower you to create an audio experience that resonates with your vision. So go forth, unleash the power of normalization, and let your audio journey be a harmonious symphony of sound!

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Let’s talk about “musical dynamics” and “musical loudness” Part 2

The two brief examples above are to tell you that frequency content, sound pressure, and sound duration will affect people’s perception of sound volume.

That is why it is said that “loudness tends to human subjective perception”.

Since the volume is the subjective perception of people, how to quantify it?

To quantify “loudness”, the first thing you need to look at is the relationship between the frequency and the loudness of the human ear. There are two pictures below, you can read them carefully for reference:

Looking at the two images above, you will clearly see that the human ear and the human brain are not an organ that flattens the receiving frequency. It will not develop here. For the basis of loudness quantization, see the second image, there is a unit called “fon”. The phon unit is an attempt to quantize loudness. We take a 1kHz signal as an example, and it can be perceived at a volume of 40dB at 1kHz, so it is 40phon. Based on this, another unit is called a sone, 1 sone = 40phon. Both are units that attempt to quantify volume.

The international organization will be the ITU and the EBU…etc. The characteristics of the human ear, the psychoacoustics of the human brain, etc., all factors that affect loudness perception are considered together, and these factors are calculated through complicated mathematical calculations Define and standardize the reasonable loudness range for ” sound reproduction” only after statistically significant results have been obtained. Those interested can search: “ITU-R 1770 and ITU-R 1771”.

Should the rules be followed?

Of course continue! In fact, there is such a problem in Taiwan. Not to mention music, only the fourth channel and MOD, the sound level of each channel is different! The scariest thing is switching from the movie station to the shopping channel and often still being scared by the sudden volume of the shopping channel. Even radio shows have this kind of situation.

Here, you can go to Google again: “Volume War Loudness War”. All this is commonplace. This article is mainly to introduce the definition and specification of loudness.

Effects of loudness specifications

Although ITU, EBU, ISO, ANSI and other organizations have introduced loudness specifications, major music and video streaming platforms still have their own standards. However, the standards of the main platforms will continue to be around the specifications, and there will be no big or outside. When it comes to the audiovisual industry, it will generally affect these things:

Music streaming platforms: Records must meet loudness specifications at time of release

Video streaming platforms: Loudness specifications must be met when movies are released

Let’s talk about “musical dynamics” and “musical sonority”

Where does the music we listen to come from?

Before we talk about it, it is necessary to quickly talk about the disc creation process. In principle, it can be divided into three parts: the initial stage, the intermediate stage and the later stage.

First stage: compose, arrange

Middle term: recording, mixing

Post: post mastering, distribution, marketing

Whether a piece of music is good or not can be determined at the initial stage of the arrangement. Then there is the recording. The recording process can be finding real musicians to record the sound of real instruments, or completing the melody required by the arrangement through software instruments. Then find a singer or singers to sing… and so on. This process is called recording.

The “balance” of a song is not only achieving the balance of the melody in the arrangement, on the other hand, it is leaning on the mix to make the recorded elements a harmony in listening and frequency, it is also usually necessary to coordinate It depends on where the track goes, or what the producer wants. After all, the purpose of a song or album is to become a commercial release, and the post-production and embellishment processes that need to be done are necessary.

Usually the post-mastering process will be done last. After the entire album’s timbre direction, volume adjustment and minor flaws etc. are fixed, the final mastering will be uploaded according to the loudness specifications required by each streaming platform. .

Quantify the volume and intensity of what we hear

Sometimes people equate loudness with loudness. Actually the two are different. They are different and at the same time influence each other.

Loudness can be quantified, in simple terms, it is our most used “decibel dB”. Volume, on the other hand, tends to be subjectively perceived by people. how to say? Different 75-decibel musical signals are sent out at a time, and everyone has different feelings about its loudness and volume.

Because loudness is related to three things: frequency content, duration, and sound pressure.

We played a 1000 Hz test signal for three minutes at a sound pressure of 80 decibels. Your perception of the volume of this signal will be very different from playing it for 10 seconds or 30 seconds.

Let us take two singers as an example, one of them has a more evident timbre in the mid-high frequency band, and the other has a more evident mid-low frequency band, they sing the same song, and they sing with the same key and similar sound pressure, generally in the mid-high frequency band. The sound of the sound will feel stronger.

Loudness normalization

When you have a lot of mp3 files, you often look for loudness normalization.

What usually happens is that we have mp3s (although Mp4Gain can do Loudness normalization of many other audio and video formats!!) that have been created with different settings, for example different bit rates… which causes them to have a loudness different and that is annoying to the ear.

Many times we have been collecting mp3s from different sources, finding one here and another there and over time we have managed to have a good collection that is worth thinking about, but we have a problem: the loudness differs between different music or video files.

And this has generated that we desperately need to find a solution.

Mp4Gain is the result of many years of experience and is definitely the best normalizer out there, I have no doubt.

Even for very advanced users, it offers different settings to adjust exactly what you are looking for. Pewreo if you are a common user, you will not need anything, just load the song or video (you can normalize one or hundreds at the same time) and click a button, it’s that simple.