In designing urban spaces perceptually more acceptable and comfortable, the available techniques of auralization and visual rendering are useful tools as they enable to create virtual environments which can be experienced and evaluated by people in laboratory. This application can provide useful hints to select the most effective solution, and hopefully less expensive as well, to either building new urban spaces or improving existing ones, taking into account the human perception and the soundscape too. The application of the above techniques in two squares in Naples is described. Five scenarios different in lay-out and sonic environment have been considered for each square and submitted to a group of subjects in laboratory for their visual and audio appraisal. A questionnaire has been designed to collect the subjective ratings on the audio and visual environments in order to evaluate their influence on the overall rating. The subjective responses have been related to some acoustic descriptors of the sonic environment as well.
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