Transcript
SPEAKER: Professor Marcus Vale, Chair of Urban Acoustics. Westmere School of Architecture. When people describe a city as noisy, they often mean traffic, machinery or voices. Yet sound is also shaped by architecture. A narrow street lined with stone, brick and glass can produce reverberation, so that even ordinary footsteps seem sharp and prolonged. In my research, I argue that urban sound is not merely something produced by people; it is something designed, sometimes deliberately and sometimes by accident. Early planners noticed the issue in modest ways. They experimented with paving, tree lines and traffic islands, but rarely asked how a whole district might sound over the course of a day. In addition, acoustic planning has become more democratic. Rather than depending only on instruments, some councils now invite residents to take part in listening walks. Participants pause at corners, markets and courtyards, noting whether a place feels lively, oppressive, intimate or exposed. What I find fascinating is that their comments often contradict the decibel readings. A square with moderate traffic may feel pleasant if it contains birdsong and conversation, while a quieter underpass may feel threatening because every sound is isolated. However, the physical city still matters enormously. A long wall can reflect sound across a playground, while a stepped facade may scatter it. In some cases, a building produces an acoustic shadow, a pocket of relative calm behind an otherwise noisy edge. Moving on, these effects are increasingly represented in soundscape maps. Unlike older noise maps, which were almost entirely technical, soundscape maps combine measurements with descriptions of human experience. They show not only where sound is loud, but where it is meaningful, irritating or socially useful. Furthermore, designers need practical judgement. They cannot model every conversation, delivery van or gust of wind. Many therefore use a rule of thumb when assessing whether an outdoor cafe, school entrance or hospital garden will feel comfortable. For example, they may ask whether speech can be understood without effort, or whether a person can hear their own footsteps. In other words, acoustic comfort is partly about control. People tolerate sound better when they understand its source and can move away from it. What's more, regulation plays a quieter role than design journals usually admit. Permits can determine whether music continues after midnight, whether deliveries occur before dawn, or whether seating spreads across a pavement. These decisions can change a street more than expensive materials do. An area I find particularly interesting is the politics of quietness. Wealthier neighbourhoods often defend it successfully, while busier districts are expected to absorb disturbance as the price of economic activity. Finally, we should resist the idea that silence is the goal. Cities need voices, bells, play and trade. The aim is not the elimination of sound, but a fairer distribution of acoustic comfort. Good urban design asks who benefits from noise, who suffers from it, and who has the authority to complain. The larger lesson is that sound is a shared responsibility. Architects, residents, businesses and councils all help decide whether a city merely functions, or whether it can also be listened to with pleasure.