The technique of oversampling and noise shaping has the potential to improve the resolution of digital loudspeaker systems, at the expense of increasing the signal bandwidth. Previous work has shown that the acoustic radiator in a digital loudspeaker system can act as a reconstruction filter if the oversampled signal bandwidth exceeds the transducer bandwidth. If the oversampled signal is within the transducer bandwidth, the use of reconstruction filters has to be considered in the system. This paper presents an investigation of reconstruction with both pre-acoustic and post-acoustic filtering. Mathematical modelling suggests that the reconstruction in a direct digital-to-analogue loudspeaker should take place before the summation of the digital bitstreams to avoid intermodulation distortion. This is counter-intuitive because the electronic driving signals are no longer digital in the digital loudspeaker system.

Authors: Busbridge, Simon C.; Fryer, Peter A.; Garrett, Chris; Zhang, Haihua
Affiliations: B&W Group Ltd.; University of Brighton(See document for exact affiliation information.)
AES Convention: 120 (May 2006) Paper Number: 6842
Publication Date: May 1, 2006 Import into BibTeX
Subject: Loudspeakers and Sound Reinforcement
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=13646

Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $33 for non-members and is free for AES members and E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 120Papers)   /120/6842.pdf

Start a discussion about this paper!