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Convention Paper

A Worst-Case Analysis for Analog-Quality (Alias-Free) Digital Dynamics Processing

Authors: Mapes-Riordan, Dan

AES Convention 105 · Paper 4766 · September 1998

Abstract

A fundamental problem of digital dynamics processing is that distortion products are produced that alias below 20 kHz. An analysis of sinewave clipping shows that a 5 MHz internal sampling rate is required to effectively attenuate aliasing components. A test signal consisting of a pair of closely spaced sinusoids that are slowly swept in frequency is suggested as a means of revealing aliasing distortion in typical digital audio systems. Many current digital audio products produce audible aliasing distortion when passing this test signal. It is suggested that there is a correlation between the amount of aliasing distortion produced in digital dynamics processors and their sonic qualities.

Details

Published in
AES Convention 105
AES Convention
105
Paper number
4766
Publication date
September 6, 1998
Session subject
Digital Signal Processing for Audio
Affiliation
Parmly Hearing Inst., Loyola University Chicago, Chicago, IL (See document for exact affiliation information.)
Type
Convention Paper