A Digitally Direct Driven Dynamic-Type Loudspeaker
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.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is temporarily free for AES members.