Essays about: "Active Noise Control"

Showing result 1 - 5 of 40 essays containing the words Active Noise Control.

  1. 1. HRTF-Based Sound Field Interpolation in the Presence of a Human Head

    University essay from Lunds universitet/Matematisk statistik

    Author : Anton Björkman; [2023]
    Keywords : Sound field interpolation; HRTF; head-related transfer function; kernel ridge regression; in-ear sound estimate; Helmholtz equation; Mathematics and Statistics;

    Abstract : There are different ways of evaluating the sound pressure in a sound field. Doing so is an essential part of several applications, such as active sound control and voice analysis. READ MORE

  3. 2. Heterogeneous catalytic reactions studied with transient gas supply and event-averaged ambient pressure x-ray photoelectron spectroscopy

    University essay from Lunds universitet/Fysiska institutionen; Lunds universitet/NanoLund: Centre for Nanoscience

    Author : Qianhui Liu; [2022]
    Keywords : Ambient pressure x-ray photoelectron spectroscopy; Event-averaging; Pd 100 surface structure oscillation; Physics and Astronomy;

    Abstract : CO oxidation over Pd(100) is studied with ambient pressure x-ray photoelectron spectroscopy (APXPS). Cyclic gas composition pulsing of the CO:O2 ratio, combined with a new method using software based event-averaging by image recognition over many pulses, is used to improve the signal-to-noise ratio substantially. READ MORE

  4. 3. A Numerical Approach for Wind Tunnel Noise Control

    University essay from KTH/Marcus Wallenberg Laboratoriet MWL

    Author : Hampus Dall; Robert Palm; [2021]
    Keywords : Technical Acoustics; ANC; Active Noise Control; Superposition; Wind Tunnel; Wingsuit; Indoor Wingsuit; Higher Order Modal Acoustic Field Beyond Plane Wave Region; Numerical Acoustic Simulations; Teknisk Akustik; Aktiv Brusreducering; Superposition; Vindtunnel; Flygning med ekorrdräkt inomhus; Högre ordningens akustisk modanalys bortom planvågsteori; Numeriska akustiska simuleringar;

    Abstract : A wind tunnel from the 1950s located in Bromma, Stockholm, once used for military research is today used for commercial activities. Today the tunnel is used for indoor wingsuit flight and the facility has an interest in reducing the overall noise generated by the tunnel. Acoustic measurements indicate noise problems in the 50 Hz range. READ MORE

  5. 4. Online Secondary Path Modelling for Spatial Active Noise Control with Arbitrarily Spaced Arrays

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Jesper Brunnström; [2021]
    Keywords : Active noise control; Secondary path modelling; Spatial; Adaptive filter; Multichannel; Least mean squares; Aktiv brusreducering; Sekundärvägsmodellering; Spatial; Adaptiv Filtrering; Multikanal; Minsta kvadratmetoden;

    Abstract : In this work we explore online secondary path modelling (SPM) in the context of spatial active noise control (ANC). Specifically, we are interested in the reduction of broadband noise over a three-dimensional region, without restrictions on microphone and loudspeaker array placement. READ MORE

  6. 5. Energy efficiency in a renovated modern office with activity-based work style

    University essay from Högskolan i Gävle/Energisystem och byggnadsteknik

    Author : Jesper Olausson; [2019]
    Keywords : DCV; energy efficiency; Closed-loop duct; thermal insulation supply ducts; Air conditioning; underfloor heating; energy audit; behovsstyrd ventilation; energieffektivitet; ringmatad ventilation; isolering av tilluftskanaler; komfortkyla; golvvärme; miljöbyggnad; energikartläggning;

    Abstract : During renovation Ljusåret 2 was converted to a modern office with an activity based work style (ABW) with a Demand Controlled Volume (DCV) ventilation system connected to a closed-loop duct. Cooling is provided through air handling units and active water based beams, the underfloor heating system was kept. READ MORE