The application of acoustical modeling principles is pervasive throughout many of Silicon Audio’s products. Acoustics is the study of sound waves, how they are generated, how they propagate, and how they are received.
The design and realization of high SNR microphones demands an in-depth understanding of how mechanical elements of the microphone interact with the surrounding air which carries the acoustic wave. To achieve 10x higher SNR performance in the same size microphone as competitors, every nuanced acoustical phenomenon matters. Silicon Audio’s directional microphones, for example, employ new and unconventional mechanical structures, compared to the age-old standard microphone architecture. Acoustical modeling and design techniques need to be re-thought for such structures, and this demands strong proficiency and understanding of fundamental acoustical principles. In other applications, rethinking acoustical design discovers entirely new phenomena. Look no further than the non-reciprocal acoustical circulator.
Silicon Audio applies computational models to intelligently design for low thermal-mechanical noise, and high overall SNR.
A transmission line model is used to study and understand air film dynamics and a rocking-style biomimetic directional microphone.
Developing the acoustic circulator for diverse applications and frequency ranges necessitates deep understanding of acoustics.
M. Farhat, P. Y. Chen, S. Guenneau, S. Enoch, and A. Alù, “Frequency-Selective Surface Acoustic Invisibility for Three-Dimensional Immersed Objects,” Physical Review B, Vol. 86, No. 17, 174303 (8 pages), November 12, 2012.
R. Fleury, and A. Alù, “Metamaterial Buffer for Broadband Non-Resonant Impedance Matching of Obliquely Incident Acoustic Waves,” Journal of the Acoustical Society of America, Vol. 136, No. 6, pp. 2935-2940, December 4, 2014.
D. Kim, M. L. Kuntzman, and N. A. Hall, "A Transmission Line Model of Back-Cavity Dynamics for In-Plane Pressure-Gradient Microphones," The Journal of the Acoustical Society of America, vol. 136(5), pp. 2544-2553, November 2014.
D. Kim, C. T. Garcia, B. Avenson, and N. A. Hall, "Design and Experimental Evaluation of a Low-Noise Backplate for a Grating-Based Optical Interferometric Sensor," Journal of Microelectromechanical Systems, vol. PP (99), pp. 1-1, March 2014.