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| Controllo Attivo del Rumore FxLMS× | Beamforming× | |
|---|---|---|
| Campo | Acustica | Acustica |
| Famiglia | Process / pipeline | Process / pipeline |
| Anno di origine≠ | 1975 | 1988 |
| Ideatore≠ | Bernard Widrow, Samuel Stearns | Van Veen, Barry Buckley |
| Tipo≠ | Adaptive noise cancellation algorithm | Directional audio array processing |
| Fonte seminale≠ | Widrow, B., & Stearns, S. D. (1975). Adaptive signal processing for active vibration and noise control. IEEE Transactions on Acoustics, Speech, and Signal Processing, 23(5), 440–453. DOI ↗ | Van Veen, B. D., & Buckley, K. M. (1988). Beamforming: A versatile approach to spatial filtering. IEEE ASSP Magazine, 5(2), 4–24. DOI ↗ |
| Alias | FxLMS, filtered-x LMS, active noise cancellation, ANC | beamformer, spatial filtering, microphone array, phased array |
| Correlati | 5 | 5 |
| Sintesi≠ | The Filtered-x Least Mean Squares (FxLMS) algorithm is an adaptive filter used in active noise control (ANC) systems to reduce unwanted sound by generating anti-noise. Pioneered by Widrow and Stearns in 1975 and refined by Eriksson and colleagues, FxLMS is the most widely deployed algorithm in commercial noise-canceling headphones, hearing aids, automotive cabins, and industrial noise barriers. It works by continuously learning the acoustical path and dynamically adjusting a canceling signal in real time. | Beamforming is a spatial signal processing technique that uses microphone arrays to selectively enhance sound from a desired direction while suppressing sounds from other directions. Formalized by Van Veen and Buckley in 1988, beamforming is fundamental to hands-free speech communication, hearing aids, sonar, radar, and spatial audio recording. It enables 'listening' with directional sensitivity despite using omnidirectional microphones, by exploiting time delays and phase differences between array elements. |
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