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Bit Expansion in Digital Loudspeakers with Oversampling and Noise Shaping

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The resolution of true digital loudspeakers is currently limited by their physical construction. Transducer arrays require 2 to the Nth power minus 1 speaklets and multiple voice coil topologies require N coils (N = the number of bits). Oversampling and noise shaping has been used to maintain resolution with fewer bits. Results are presented where the oversampled signal falls both within and outside of the bandwidth of the radiator. A linear model is being developed to understand the observations. The radiator displacement shows little difference between the original and oversampled cases. It is concluded that the limited bandwidth of existing acoustical radiators is advantageous in acting as the re-integration filter. In circumstances where this is not possible the auditory system may perform this task.

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