Sound performance in accessible auditoriums for blind people

Abstract

This article discusses the role of acoustic parameters in creating sensorily inclusive auditoriums, focusing on the spatial experience of visually impaired individuals. In a field historically centered on vision, the research proposes sound as an architectural language and a tool for inclusion. For blind individuals, hearing is more than a means of communication—it is a tool for orientation, volumetric reading of space, and social interaction. The study combines simulations using the EASE Acoustics software and binaural auralization to evaluate both the technical aspects and the subjective listening experience within the environment. Parameters such as reverberation time (RT60), clarity index (C50), speech transmission index (STI), as well as Interaural Level Difference (ILD) and Interaural Time Difference (ITD) are considered, analyzing scenarios before and after acoustic interventions using carpets, absorbent panels, and reflectors. The results demonstrated reductions of over 60% in RT60 (500Hz), increases of up to 173% in C50, and significant improvement in STI, enhancing speech intelligibility, sound directionality, and the perception of spatial depth. These improvements broaden auditory perception and speech clarity for blind individuals in built environments. The research proposes specific acoustic performance guidelines focused on sensory accessibility, advocating for listening as a design criterion rather than merely a technical attribute. It reinforces the importance of acoustics as a structuring element of spatial experience for all, especially for those who listen to see. Thus, the research contributes to expanding the understanding of architectural accessibility, positioning acoustics as a critical dimension of contemporary inclusive design.