An Active Headset Based on Hybrid Active Noise Control Technology

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Mathias Winberg, Sven Johansson, Ingvar Claesson
Title: An Active Headset Based on Hybrid Active Noise Control Technology
Conference name: Inter-Noise 2001
Year: 2001
Pagination: 557-562
City: Hague, Netherlands
Organization: Blekinge Institute of Technology
Department: Department of Telecommunications and Signal Processing (Institutionen för telekommunikation och signalbehandling)
Department of Telecommunications and Signal Processing S-372 25 Ronneby
+46 455 38 50 00
Authors e-mail:
Language: English
Abstract: In helicopters, the low frequency noise generated by the rotors and engines often masks and jeopardizes safe communication. In addition, pilots are likely to su?er from damage to their hearing due to the high sound levels in the headset produced to overcome the noise caused by increased speaker levels. A feasible approach is to reduce the low frequency noise by using active techniques combined with a method for reducing the noise in the intercom microphone signal, with lower speaker levels as a result. Helicopter noise consists of tonal components embedded in broadband noise. In order to achieve
an e?cient attenuation of the primary noise inside the headset, a combination of a digital feedforward controller and an analog feedback controller is employed. Spectral Subtraction is used to suppress the background noise in speech signals. This paper evaluates a combination of the two techniques and their application to real data.
Subject: Signal Processing\Active Noise and Vibration Control
Signal Processing\Speech Enhancement
Keywords: active noise control, feedforward controller, feedback control, headset, spectral subtraction, speech enhancement, headset