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.

Authors: Kuniyoshi, Daigo; Ohtani, Hajime; Okamura, Junichi; Suzuki, Ryouta; Tsuihiji, Kenzo; Yasuda, Akira
Affiliations: Hosei University, Koganei, Tokyo, Japan; Trigence Semiconductor, Chiyoda, Tokyo, Japan(See document for exact affiliation information.)
AES Convention: 129 (November 2010) Paper Number: 8236
Publication Date: November 4, 2010
Subject: Loudspeakers and Microphones

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