Audio algorithm engineer
Silicon Integrated, Co., Ltd.
Wuhan, Hubei, China (People's Republic)
Currently, I work as an audio algorithm engineer in Silicon Integrated, Co., Ltd. From July 2017 to August 2018, I worked as an acoustic engineer focused on the micro-speaker structure design and the performance analysis employing acoustic simulation. In June 2017, I received an MSc degree in acoustics from South China University of Science and Technology.
My talk is on protection limits for micro-speakers. The increasing demand for high-definition audio in mobile platforms is creating the necessity of adequate operation limits for smart amplifiers to maximize the power delivered to micro-speakers safely. The maximum voice-coil temperature (Tmax) is an essential parameter for protection algorithms that prevent damage. Standard tests used by micro-speaker suppliers to specify Tmax provide a conservative estimate that depends on the voice-coil materials. Other tests consider the rated noise power, a specification obtained by rigorous lifetime tests. We investigate the thermal limits when micro-speakers operate at their specified rated power. We contrast these power-based thermal limits with values of Tmax specified in datasheets. The evidence found is used to recommend procedures to measure power-based thermal limits that avoid over-protection.
For details, please read our open-access paper available in the AES library in the following link: http://www.aes.org/e-lib/browse.cfm?elib=20832
C. Peng, Y. Shi, B. Yan, L. Wu, Z. Chen, C. D. Salvador and D. Liu, “Power-based thermal limits for micro-speaker protection algorithms,” in 148th Audio Eng. Soc. Convention, Vienna, Austria, June 2020.
Tuesday, June 2, 2020