This paper presents a summary of research dedicated to the development of Active Noise Control (ANC) systems. The primary objective is to enable natural ventilation while effectively suppressing environmental noise intrusion—an increasingly critical issue in urban residential environments. A central contribution is the development of an acoustic curtain. This system integrates loudspeaker–microphone pairs around the window opening. Multiplecontrol strategies were investigated, including feedforward and feedback implementations of the FxLMS algorithm. Additionally, intensity-based control methods were evaluated to improve robustness and adaptive performance under realistic boundary conditions, such as airflow fluctuations, wind turbulence, and time-varying noise sources. Simulation studies and full-scale experiments validate the system behavior and assess the effectiveness of various control approaches under practical constraints. To address limitations related to physical integration a soundbar-like ANC module was developed. Another phase of the research involved the application of the ANC technologies to the HafenCity Window, an innovative façade-integrated window concept combining passive ventilation and acoustic comfort. This paper synthesizes the main technical findings, outlines key implementation challenges, provides an overview of ANC designs for the integration into building envelopes, and points toward future research directions in intelligent and adaptive acoustic control for buildings.
Sachau et al. (Wed,) studied this question.