If the speaker can be driven digitally, it becomes possible to perform all processes from the input to the output digitally without analog components such as a power amplifier, and a small, light, and high-quality speaker system can be achieved. In this paper, we propose a basic idea of Digital-Speaker and a digital-driven dynamic-type loudspeaker that provided with multiple-voice coils employing multi-bit delta-sigma modulation. The piezo-electric-speaker, which was utilized in previous paper, is replaced with the voice coil. The prototype implemented with a FPGA, CMOS drivers, and dynamic-type loudspeaker. THD and SPL are about 0.42% and 104dB, and the output power is 1W even when power supply is 1V.
Authors:
Kuroki, Kazushige; Saito, Ryota; Shinkawa, Naoto; Tsuchiya, Tomohiro; Yasuda, Akira
Affiliation:
Hosei University
AES Convention:
124 (May 2008)
Paper Number:
7344
Publication Date:
May 1, 2008
Subject:
Microphones and Loudspeakers
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