DEVELOPMENT OF AN ACTIVE NOISE CONTROLLER IN THE DSP STARTER KIT

This paper shows the implementation of a low cost active noise

control (ANC) on the DSP Starter Kit TMS320C26 [1]. The ANC system

uses a filtered-x LMS adaptive algorithm [2] with on/off-line

path cancellation estimates [3,4,5]. The system consists of an

error microphone plus a signal amplifier, two powered speakers

(primary and secondary source) and the controller (the DSP Starter Kit).

The total performance is limited by the DSK features but it is possible

to reach 30 dB of acoustic attenuation in narrowband acoustic noises.

The fixed-point DSP controller has been programmed with an assembler

and a debugger supplied by Texas Instruments, and the final application

is built on the Windows operating system environment where the user

can easily modify the parameters of the active noise controller

(filters taps, convergence factors, leaky factors) with a friendly

control panel.

This document was an entry in the 1997 DSP Solutions Challenge, an annual contest organized by TI to encourage students from around the world to find innovative ways to use DSPs. For more information on the TI DSP Solutions Challenge, see TI's World Wide Web site at www.ti.com.

*DISCLAIMER: This document was part of the DSP Solution Challenge

1995 European Team Papers. It may have been written by someone whose

native language is not English. TI assumes no liability for the

quality of writing and/or the accuracy of the information contained herein.

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