Real world active noise cancellation using a multichannel DSP56001 system

Author

Stewart, R.W. ; Swan, I. ; Schmid, D.

Author_Institution

Dept. of Electron. & Electr. Eng., Strathclyde Univ., Glasgow, UK

fYear

1993

fDate

11/16/1993 12:00:00 AM

Firstpage

42583

Lastpage

42590

Abstract

Reports on the design and the real time performance of a portable active noise cancellation (ANC) system based around a PC hosted 20 MHz Motorola DSP56001 processor with a 4 channel analogue I/O board connected to the real world via standard consumer audio components. The system uses multi-channel filtered-X and filtered-U adaptive LMS algorithms, and includes facilities for on-line system identification. The linear response of this ANC system has been tested over the frequency range 65-500 Hz to easily produce cancellation of 20-40 dB for single tones and sums of a few tones. The authors present the performance of the ANC system when used to cancel a number of real world noises

Keywords

acoustic noise; computerised instrumentation; digital signal processing chips; environmental science computing; microcomputer applications; noise abatement; 4 channel analogue I/O board; 65 to 500 Hz; ANC system; PC hosted 20 MHz Motorola DSP56001 processor; active noise cancellation; filtered U adaptive algorithm; least mean squares; linear response; multichannel filtered X-adaptive algorithm; on-line system identification; real time performance; tones;

fLanguage

English

Publisher

iet

Conference_Titel

Audio DSP - Circuits and Systems (Digest No. 1993/219), IEE Coilloquium on

Conference_Location

London

Type

conf

Filename

677447