Gaming and virtual reality systems all provide the user with some level of audio feedback. In the event of an augmented reality, a sound effect could be easily emphasised when interacting with a digitally created item in the real world view. Although audio can help sell the video illusion, certain limitations exist. A typical stereo headphone setup may offer a few limited differentiation between the left and right at a fundamental level. Virtual sound systems can falsify 3D positions by changing Sound Effect properties to emulate distorted positions.
For instance, a tone played behind the head of the user could be muffled while one could be much clearer from the front. Although useful, however, the effect is unacceptable as differences in physiological elements such as the ears, head and body can affect something a person expects to hear in a certain position from a noise.
Apple is satisfied, by having what it calls the Head-related transmission function (HRTF), to improve the effect of virtual 3D sound positioning in a Tuesday patent entitled "Head related Transferring function Selections for Binary Sound Reproduction." These are indeed a couple of acoustic filters per ore that characterise the sound's transmission from one location into the surroundings.
Each HRTF varies according to several factors , in order to match space hearing expectations among people. Whilst creating a HRTF for an individual user using consumer electronics with any true degree of precision is relatively time consuming or unworkable, it's also possible to either use a generic "averages" HRTF or choose a HRTF that is closest to your needs.
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The HRTF is then used to reproduce the audio recording as a bilateral sound, which, on the other hand, is played by headphones as part of a digital signal processing simulation algorithm. The patent focuses on the selection of the nearest HRTF, by shortening the database to just a few. The process of cutting can include the removal of alternatives which are far from the user's basic features like height, gender, breed and age.
The patent advises that the database is reduced to a smaller number and that the most correct HRTF is used. The system could reduce its selection to the most generic in the list, to select the most suitable HRTF for use after the initial settings are done. In order to help further the system, the audio device for the user could be used for a binaural measurement. If only one user use this device, the measurement should be carried out only once, but other information on which HRTF is best available is potentially available.
It is also suggested that the mass use of various HRTFs can be monitored in order to improve the selection by grouping users. The system would, for example, be wrong to those certain filters if it meant someone who matches these settings in the future, knowing that users between 20 and 25 years of age prefer HRTFs with certain features.