| Author: | Ng, Chung-yee |
| Title: | Dissertation report of multiple channel active noise cancelling |
| Degree: | M.Sc. |
| Year: | 2000 |
| Subject: | Noise control Acoustic impedance Hong Kong Polytechnic University -- Dissertations |
| Department: | Multi-disciplinary Studies Department of Electronic and Information Engineering |
| Pages: | vi, 78 leaves : ill. ; 31 cm |
| Language: | English |
| Abstract: | The control problem of Active Noise Cancellation (ANC) was investigated. It is an acoustic reduction of noise by introducing a corresponding anti-phase sound wave. At a known area in space, destructive interference of the noise source by an anti-phase sound wave is made to occur, resulting in a quiet zone. This anti-phase sound is produced by means of adaptive filtering. Experiments were performed using a PC computer equipped with analog-to-digital converters and digital-to-analog converters. Computer simulations were also carried out by MATLAB, a software package for numeric computations. Finally, A feedforward 1x2x2 (one noise reference, two cancelling driving sources and two error sensors) ANC system demonstrates an improved noise reduction area. In which, the adaptive multiple channel filtered-X LMS algorithm is used for updating the feedforward controllers. In addition, secondary path modelling techniques were also studied. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b15177683.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 2.08 MB | Adobe PDF | View/Open |
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