Acoustic representation for voice expertise has evolved beyond flat spectral analysis. Today, sound engineers and forensic experts use 3D models to virtually recreate the original scene of a recording. These models allow simulating sound propagation in enclosed spaces, auditoriums, and studios, identifying anomalies such as artificial reverberations or phase shifts that reveal manipulations in the audio track.
Simulation of sound propagation in virtual environments 🎧
Software such as EASE (Enhanced Acoustic Simulator for Engineers) and ODEON allows building digital twins of concert halls, courtrooms, or recording booths. The expert inputs the characteristics of the microphone used and the dimensions of the space, and the acoustic engine calculates how sound reflects off walls, ceilings, and furniture. In real voice authentication cases, this technique has revealed discrepancies between the expected acoustics of a room and those captured in the audio, exposing setups or edits. For example, a recording that supposedly took place in a soundproofed studio but shows echo patterns typical of an empty room can be dismissed as evidence.
The challenge of verisimilitude in sound scenography 🎭
For live show scenographers, this technology offers a dual benefit. On one hand, it allows designing venues whose acoustics reinforce the actor's voice without the need for post-production. On the other hand, it demands ethical reflection: if a 3D model can simulate any sound environment, to what extent is it acceptable to modify the acoustics of a recording without altering its veracity? The answer lies in the transparency of the process, documenting each step of the simulation so that voice expertise remains a tool for justice, not fiction.
How 3D acoustics is integrated into forensic voice expertise to accurately recreate the sound path and speaker position in a crime scene
(PS: lighting simulation always looks better than reality... like Tinder photos)