If you were to place tiny microphones inside your ears and make a recording, it would include the effect of your personal HRTF. As part of our hearing system, our brains are able to decode all those changes to decipher where the sound likely originated in the space around us. Those physical interactions impact the timing, levels, and phase relationships of the different frequency content of the sounds we hear.
The term HRTF refers to the effect our shoulders, head, and outer ears have on sound waves coming from different sources before they encounter our eardrums. To make 3D audio work, the virtual soundfield signals generated by the PS5 for your headphones or speakers are multiplied with a detailed Head Related Transfer Function (HRTF). Sony 3D audio will work over your existing TV speakers, a stereo, 5.1 or 7.1 system, or preferably, headphones, which convey the effect of 3D audio most dramatically. Since all the processing is built-in, no special external hardware is necessary. In practice this means you get a better sense of immersion through atmospheric sounds the audio also can provide more accurate clues about what’s happening both on and off-screen, around the player.
This provides increased “presence and locality,” in Sony’s words. The developers position game sounds in 3D space around the player to reflect where those sounds should be, relative to the player and the screen in front.
Unfortunately, Sony’s 3D audio system is not compatible with either Dolby Atmos or DTS:X, even though the PS5 will output Atmos encoded digital audio when playing a Blu-ray disc. This is becoming a crowded field, given that Microsoft’s Windows Sonic spatial sound system also supports Xbox One and Xbox Series X/S. Rather than adopt or build on an existing standard such as Dolby Atmos or DTS:X, Sony created its own competing system from the ground up. You won’t be needing those up-firing speakers to experience Sony 3D audio.
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