Headphone virtualization is a sound-emitting technology in which standard stereo headphones deliver a surround sound experience through chips or sound cards based on onboard digital signal processing (DSP). Activation carries out via the operating system or the firmware/driver of the sound card.

A listener can knowledge the sound of the virtual speakers through headphones with a realism that is difficult to distinguish from the actual speaker experience. PRIRs (Personalized Room Impulse Response) defines recordings for speaker sound sources with a limited number of headphone positions. They are using PRIRs to convert an audio signal for the speakers to a virtualized output for the headphones. By basing the transformation on the listener’s head, the system can adjust the change so that the virtual speakers do not appear to move when the listener moves their head.


With headphone virtualization, two-channel headphones can carry Dolby 5.1 or better sound presentation. It base on the principles of HRTF (Head-Related Transfer Functions) technology, which uses the structural design of a human head to transmit various sound signals.

Unlike conventional headphones, which transmit sound directly into the ears, headphone virtualization delivers sound outside or around the head’s listening experience. A user can easily distinguish sounds occurring from left to right, right to left or from center to bottom, and so on.

The only difference from the surround headphones you’ll find on many sound cards is the use of convolution. Instead, they can use functions that try to mimic the impulse responses of the middle ear with additional environmental influences. However, these virtualizations treat like speakers that place around the ears. The passing on of the impulses now leads to reactions of these surrounding methods, which can use with the APO Equalizer to make your Windows audio look like it could process with one of these headphone surround virtualizations.

Virtual Surround Sound and Sound Cues

Most people experience sitting in a quiet room, such as a classroom, during a test and seeing the silence broken by an unexpected noise, like coins falling out of someone else’s pocket. ‘. Usually, people immediately turn to the sound source. Turning to the sound seems almost instinctive – your brain will determine the location of the sound instantly. It is often the case, even if you can only hear with one ear.

People can locate sound foundations based on the brain’s analysis of sound qualities. One excellence has to do with the alteration between the sound your right ear hears and the sound your left ear hears. Another reason concerns the interactions between sound waves and the head and body. Together, these are the acoustic signals with which the brain recognizes where a sound is coming from.

The differences in time and level give your brain an idea of ​​whether a sound is coming from the left or the right. However, these differences contain less information about whether the sound is coming from above or below. It is because changing the level of a sound affects the path it takes to reach the ear, but not the difference between what you hear in your left and right ears.

It’s hard to tell if a tone is coming in front of you or behind you because you rely only on time and level differences. In fact, in some cases, these sounds can create identical ILDs and ITDs. Even if the sound comes from a different location, the differences in what your ears hear will be the same. ILDs and ZTDs are cone-shaped areas that extend outward from your ear and are known as cones of confusion.

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PIL and ITD require people to be able to hear with both ears. But even people who cannot be present in one ear can often determine the sound source. It is because the brain uses sound reflections from the surfaces of an ear to locate the onset of sound.

When a sound wave hits a person’s body, it reflects off their head and shoulders. It reflects off the curved surface of the person’s outer ear. Each of these likenesses causes subtle vagaries in the sound wave. Reflective waves restrict with each other, creation parts of the wave larger or smaller and changing the volume. These differences are known as Head-Relate Transfer Functions (HRTFs).

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