A bit-grouped digital transducer array loudspeaker with different numbers of nominally identical transducers for each bit has been developed. The direct digital-to-acoustic conversion process produces a sound field whose quality is shown to be spatially dependent and highly influenced by real effects including non-uniform transducer frequency responses, transducer mismatching, baffle size and room acoustics. Spatial sound pressure maps show that reducing the array size leads to improved reconstruction due to reduced phase distortion. For a given sampling rate and signal frequency, total harmonic distortion decreases as the listening distance is increased. A new criterion for the sweet-spot location in digital arrays is proposed based on the difference between the distortion introduced by path-length differences and the inherent quantisation distortion.
Authors:
Mendoza-López, Jorge; Busbridge, Simon C.; Fryer, Peter A.
Affiliations:
B&W Group Ltd.; University of Brighton(See document for exact affiliation information.)
AES Convention:
120 (May 2006)
Paper Number:
6835
Publication Date:
May 1, 2006
Subject:
Loudspeakers and Sound Reinforcement
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.