Active control of excessive sound emission on a mobile device.
During a phone conversation, loud vocal emission from the far-end to the near-end space can disturb nearby people. In this paper, the possibility of actively controlling such unwanted sound emission using a control source placed on the mobile device is investigated. Two different approaches are tested: Global control, minimizing the potential energy measured along a volumetric space surface, and local control, minimizing the squared sound pressure at a discrete point on the phone. From the test results, both approaches can reduce the unwanted sound emission by more than 6 dB in the frequency range up to 2 kHz.
Digital Signal Processing Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea jdotsw@dsp.yonsei.ac.kr, dhyoun@yonsei.ac.kr.
Se-Woon
SW
Jeon
Digital Signal Processing Laboratory, Department of Electrical and Electronic Engineering, Yonsei University, Seoul, South Korea jdotsw@dsp.yonsei.ac.kr, dhyoun@yonsei.ac.kr.
Dae Hee
DH
Youn
Computer and Telecommunications Engineering Division, Yonsei University, Wonju, South Korea young00@yonsei.ac.kr.
Young-cheol
YC
Park
Digital Media and Communications, Research and Development Center, Samsung Electronics Company, Suwon, South Korea gw325.lee@samsung.com.
Gun-Woo
GW
Lee
D000162:Acoustics / Q000295:instrumentation; D040421:Cell Phone; D017097:Electric Impedance; D006801:Humans; D009622:Noise; D013016:Sound; D013018:Sound Spectrography