What Is Spatial Audio? An Introduction to Spatial Sound and Its Applications

This article explores what spatial audio is, how it works, and why it is set to change the way we experience sound.

In this article, we explore what spatial audio is, how it works, and why it's going to change the future of our listening experience.

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Imagine sitting in total darkness and watching an exciting movie. Suddenly you hear the sound of a helicopter flying not only from the right or left, but directly above your head; Then you hear someone's footsteps approaching you from behind. This immersive and riveting experience is the magic of Spatial Audio technology.

In the past decades, the audio industry has come a long way. From mono (single-channel) sound that compressed everything into one point, to stereo (two-channel) sound that added depth to the music, and then surround systems that surrounded the audience using multiple speakers. But Spatial Audio has gone a step further and broken the physical boundaries of speakers. In this article, we explore what spatial audio is, how it works, and why it's going to change the future of our listening experience.

To better understand spatial audio, you need to understand the concept of "object-based audio". In traditional systems such as stereo or even Sarand 5.1, the sound engineer determines which sound will be played from which speaker (left, right, center or rear). This means that the audio is mixed based on the preset channels.

But in Spatial Audio technology (of which Dolby Atmos is one of the pioneers), the sound is no longer tied to a specific speaker. A sound engineer can define each sound element (for example, the sound of a bird singing or a gunshot) as an "independent object in a three-dimensional space". The player system, according to the hardware you have, calculates in real time how this sound should reach your ears so that you feel that the bird is exactly at a height of two meters and an angle of 45 degrees.

In simpler terms, Spatial Audio creates a spherical, 360-degree space around your head where sounds can freely move or move anywhere.

What makes Spatial Audio a revolutionary phenomenon in modern headphones and hands-free is a feature called dynamic tracking of head movements.

Suppose you are watching a concert on your phone or tablet and the singer is standing in front of you. In normal stereo mode, if you turn your head to the left, the singer's voice will still play in both ears with the same balance as before; It means that the concert stage rotates with your head.

But with dynamic head tracking enabled in Spatial Audio:

By tricking the brain through complex HRTF (Head Related Transfer Functions) algorithms, this technology makes you think the sound is coming from the surrounding environment, not from the millimeter speakers inside your ears.

To make the differences clear, let's compare these three generations with a visual example:

You may ask, what is the use of this complex technology in everyday life? The penetration of spatial sound is much wider than you might imagine:

Platforms such as Apple Music, Tidal and Amazon Music are recreating their music archives in spatial audio format. When you listen to a piece of music mixed with Spatial Audio, it feels like the drums are behind you, the guitar is to the right, and the singer's voice is right in the center and in front of your face. This level of audio resolution reveals details of the song that would never be heard in stereo mode.

Action, science fiction and horror movies benefit the most from this technology. Streaming networks like Netflix and Disney+ support surround sound. Without the need to buy expensive home theater systems and long cables, with just a pair of compatible headphones, you can bypass the roar of airplane engines overhead and bring the theater into your bedroom.

In first-person shooter games (like Call of Duty or PUBG), knowing the exact direction of sound is the difference between winning and losing. Spatial sound allows gamers to recognize the exact distance and direction of enemy movement just from the sound of footsteps or magazine change. This means a perfect 3D sound radar.

3D image without 3D sound is incomplete. In virtual reality (VR) headsets, Spatial Audio plays a vital role in user immersion. When you participate in a virtual Metaverse meeting, each person's voice is heard from exactly where their avatar is sitting.

To enter the world of 3D audio, you need two main prerequisites: compatible content and supporting hardware.

In terms of content, your video or music should be mixed according to standards such as Dolby Atmos or Sony 360 Reality Audio. But on the hardware side, Apple has been one of the biggest catalysts in promoting this technology to the general public. Using modern AirPods offers one of the most standard dynamic head-tracking experiences due to the seamless coordination of hardware and software.

For users who want to access this technology at a reasonable cost, knowing the price of the original Airpod 4 and getting it is a very smart choice; Because the new generations of these gadgets are equipped with powerful audio processing chips that perform complex Spatial Audio calculations without any delay. On the other hand, more professionals and technology lovers who, in addition to spatial sound, are looking for the highest level of noise canceling and bass quality, usually wait impatiently for the arrival of flagship generations and consider the purchase of AirPods Pro 3 (if newer versions are available) as a long-term investment to experience a personal audio cinema.

Of course, this feature is not exclusive to one brand. Sony flagship headphones, Samsung Galaxy Buds (with 360 Audio) and many professional gaming headsets also support similar technologies based on object-oriented sound.

Every new technology has its own challenges. Because spatial sound requires heavy real-time processing and a stable Bluetooth connection, it may cause latency or quality loss in high frequencies in some cheap and miscellaneous headphones. Also, if the music was made in the studio for stereo mode and the software tries to artificially spatialize it (Spatialize Stereo), the end result may sound a little hollow, echoy, or unnatural. Spatial sound is only at its best when the audio track is mixed and mastered to this standard from the beginning.

Spatial Audio technology is more than just a gimmick or a simple equalizer; This technology is a fundamental paradigm shift in the way our brain interacts with sound waves. By converting sound from fixed channels to moving objects in a three-dimensional space, the border between the digital world and reality is becoming less and less.

Whether you're looking to discover hidden layers in your favorite artist's music, immerse yourself in Hollywood movies, or seek a strategic edge in video games, spatial audio is the definitive answer to your need. If you haven't experienced this technology yet, we suggest that you step into this amazing and limitless world with a compatible headphone and a Dolby Atmos piece of music at the first opportunity; Because once you hear real spatial sound, it will be very difficult to go back to traditional stereo sound.

I have been writing professionally in the field of technology since 2016, and my main focus is on hardware, digital market and consumer products analysis. During these years, I have tried to move beyond the mere introduction of products, and with an analytical approach, I have examined market trends, brand strategy, and the real value of each product for the Iranian user. My interest in technology is not only limited to technical specifications; For me, every product is a story of engineering decisions, business competition and user experience. From covering news and developments in the industry to compiling buying guides and analyzing daily market prices, I try to provide accurate, up-to-date and practical information so that the audience can make a more informed decision. I believe that technology journalism is not just news transmission; Rather, it is the translation of the complex world of technology into a clear, understandable and reliable language for the audience.