Δεν κατάλαβες, εννοούσα αν εμείς με κάποιου είδους εξίσωση μπορούμε να υπολογίσουμε που θα χτυπάει η ακτίνα του ηχείου με βάση την κλίση του. Βαριά μαθηματικά δλδ με φυσική μαζί..
Χωρίς να λαμβάνουμε υπ' όψη τα μαθηματικά που χρειάζονται για το Head Related Transfer Function και το Inter Aural Crosstalk Cancellation;
Ένα πολύ ωραίο άρθρο επάνω στο θέμα είναι αυτό εδώ, βάζω το σημείο σχετικά με αυτό που ρωτάς:
Dolby Atmos Elevation speakers employ a HRTF in their analog crossovers in attempt to trick the brain into perceiving height. But is this really necessary or can it degrade their sound quality?
www.audioholics.com
How is the Reflected Sound Perceived as Elevated Height?
It’s important to better understand how reflective speaker technology works independent of whether it has a HRTF implementation in the crossover or not.
Atmos Elevation Speaker Reflection Diagram
As you can see in the illustration above for a speaker firing up towards the ceiling with the axis 20 degrees off of vertical and an 8 foot ceiling, the axis of the reflected sound will be 35" in front of the speaker at seated ear height (35"). The path length for the reflected sound will be 116". The reflected sound will arrive 6ms after the direct sound, and due to distance will be attenuated 10dB (ref 1m). This is within the domain of the Precedence effect (Toole, Sound Reproduction: Loudspeakers and Rooms, Figure 6.16) which in normal situations would mean that we localize to the direct sound from the loudspeaker and the reflection is not perceived as a separate spatial event.
Dolby Atmos Diagram - Courtesy of Pioneer
However with the spectrum of directed and reflected sound being so vastly different, the Precedence effect breaks down and both the originating loudspeaker and the point of reflection may be heard as coexisting sound sources having different spectral balances. In the case of an Atmos reflective speaker, this helps the reflected sound at higher frequencies to be localized as a separate event. The fact that transients play an important role in localization in complex sound fields further explains why the bounce effect can work as well as it does.
Sounds with insufficient high frequencies will be localized at the origin speaker.
However, as the listener moves further away from the speaker, he/she will move progressively off-axis to the reflected sound and on-axis to the direct sound, thus reducing its ability to be localized as a discrete elevated sound source. At a listening distance of 10 feet (3m) and an ear height of 35" the listener will be 27 degrees off axis for the reflected sound. The reflected sound will arrive 3.3ms later than the direct sound and will be attenuated 3dB by the distance ratio. As the listener moves closer to the reflective speaker, the Precedence effect dictates the direct sound being dominant making it more localized at the source of origin rather than an elevated event.