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Session No.

Teaching Digital Filter Design Techniques Used in High-Fidelity Audio Applications

Venkatraman Atti, Andreas Spanias, Constantinos Panayiotou, Yu Song

E-mail: [atti, spanias, costasp, yu.song] @asu.edu Department of Electrical Engineering, MIDL Lab Arizona State University, Tempe, AZ 85287-5706, USA

Abstract

This paper presents web-based computer laboratory experiments and related assessment results for

digital filter design modules that have recently been integrated into the ASU’s J-DSP tool. Filter design

experiments (included in EEE407 DSP class) based on windowing, frequency-sampling, the Kaiser-

design, Min-Max design, and IIR analog filter approximations have been discussed in the context of

perceptual and lossless audio coding. We complement these filter design techniques and the laboratory

experiments with some high-fidelity audio applications involving, reverberation, echo generator,

bass/treble control, and shelving/peaking digital filters. On-line evaluation forms to assess student

learning experiences have been carefully designed in the form of an XML database.

I. Introduction

T he launch of high-end storage formats like the DVD-Audio and the Super Audio CD (SACD) in

the consumer market, and the advancements in the multimedia processors and the storage capacity

eventually spurred the need for high-fidelity audio coding schemes. Lossy (perceptual) and lossless audio

coding techniques form the two key areas of audio coding research today. In lossy audio coding (LAC)

schemes, the encoder discards the information that is not perceptually important, while this is not so in the

case of lossless audio coding (L2AC) methods, where the audio data is merely ‘packed’ to obtain a bit-for-

“Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright © 2004, American Society for Engineering Education”

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Panayiotou, C., & Song, Y., & Atti, V., & Spanias, A. (2004, June), Teaching Digital Filter Design Techniques Used In High Fidelity Audio Paper presented at 2004 Annual Conference, Salt Lake City, Utah. 10.18260/1-2--13610