Combing sigma-delta modulation with digital drivers in a loudspeaker array adds an extra dimension of flexibility because a smaller number of transducers can each be driven with a unique digital signal. The drive signal is effectively a vector. This architecture has the advantage of high integration, smaller size, lower cost, and improved electroacoustic efficiency. Based on simulations and experiments, it is clear the various performance metrics, such as sound pressure level, signal-to-noise, and harmonic distortion, are a function of the spatial angle relative to the midline. Because of the differences in acoustic path length, the quantization noise in the channels may no longer cancel at some angles.
Cai, Yefeng; Mu, Yongsheng; Wu, Ming; Ma, Dengyong; Yang, Jun
Affiliation: State Key Laboratory of Acoustics and the Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China
JAES Volume 61 Issue 3 pp. 99-112; March 2013
Publication Date: April 9, 2013
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