A Novel Universal-Serial-Bus-Powered Digitally Driven Loudspeaker System with Low Power Dissipation and High Fidelity
We propose a novel digitally driven speaker system (DDSP) in which a newly devised mismatch shaper method, multi-level noise shaping dynamic element matching (ML-NSDEM), is utilized so as to realize high fidelity, high sound power level (SPL), and low power dissipation. The ML-NSDEM unit can easily increase the number of sound pressure levels by using an H-bridge circuit even when the number of sub-speakers is fixed. It reduces the noise caused by quantization and speaker mismatches; it also decreases the switching loss. The output SPL equipped with six voice coils is 94dB/m when a 3.3V USB power supply is used exclusively. The power efficiency is 90%@0dBFS and 75%@ -20 dBFS.
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