While experimental prototypes of digital loudspeaker arrays usually use a PCM format, preliminary results show that sigma–delta technology is also a viable alternative. In the test configuration, an FPGA is connected to 32 autonomous true-digital amplifiers driving a corresponding number of miniature moving-coil loudspeakers organized in an array. The sigma–delta approach produces comparable results but with lower harmonic distortion, especially off axis and at mid-frequencies.

Authors: Tatlas, Nicolas-Alexander; Kontomichos, Fotios; Mourjopoulos, John
Affiliation: Audio and Acoustic Technology Group, Wire Communications Laboratory, Electrical Engineering and Computer Engineering Department, University of Patras, Patras, Greece
JAES Volume 57 Issue 1/2 pp. 38-45; January 2009
Publication Date: March 6, 2009

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