Which acoustic design innovation was specifically developed in response to customer feedback about noise levels in open-plan offices and is now a standard consideration in commercial architecture?

In modern architecture, customer feedback has driven significant innovations in acoustic design, especially in public and commercial spaces. Architects must now consider not just the visual aesthetics, but how buildings sound to their occupants. This trivia question explores an interesting development in acoustic design technology that has transformed how architects approach sound management in their projects.

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Sound masking systems that emit ambient background noise to reduce distractions
Noise-cancelling ceiling panels that actively neutralize sound waves
Acoustic metamaterials that can bend sound waves around spaces
Resonant frequency modulators that convert speech to inaudible vibrations