• Title/Summary/Keyword: 가상마이크로폰

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Designing a Microphone Array System for Noise Measurements on High-Speed Trains (고속철도 차량의 소음 측정을 위한 마이크로폰 어레이 설계 연구)

  • Noh, Hee-Min;Choi, Sung-Hoon;Hong, Suk-Yoon;Kim, Seog-Won
    • Journal of the Korean Society for Railway
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    • v.14 no.6
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    • pp.477-483
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    • 2011
  • In this paper, noise source localization of the Korean high speed train was conducted by using delay and sum beam-forming method of a microphone array. At first, the microphone array having irregular configuration was designed and the resolution of which was analyzed from parameters such as 3-dB bandwidth and maximum side-lobe level. After the demonstration, the microphone array was applied on the high speed train and noise localization of the high speed train driving at 300 km/h was performed successfully.

A Study on the Validity of the Prediction of Binaural Parameters by 5 Channel Microphone System (5채널 마이크로폰 시스템을 활용한 공간감 지표 예측의 타당성에 관한 연구)

  • Jang Jae-Hee;Oh Yang-Ki;Jeong Dae-Up;Jeong Hyok
    • The Journal of the Acoustical Society of Korea
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    • v.24 no.2
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    • pp.103-110
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    • 2005
  • Providing adequate amount of spatial impression for spaciousness) has been known to be one of the most important design considerations for the good acoustics of rooms for music. and the measurement, of room acoustics using parameters. such as LEF and IACC, forms an essential part of such evaluation. However. it is unavoidable to use different transducers (figure of eight microphones. head and torso) for the measurement of each parameter and it tends to make the measurement procedure complicated. The Present work tried to provide a simpler way to measure these binaural room acoustic parameters including monaural ones with a single measurement system using both spatial information collected through a 5-channel microphone and a trained neural network. A computer simulation program, CATT-Acoustic V7.2. which allowed us to obtain exactly the same spatial information as a 5-channel microphone was used. since it requires quite a large amount of data for practical training of a neural network. Since each reflection has different energy. delay and direction, energy should be integrated properly. the concept of ray tracing method was applied inversely in this work. Also applying weightings according to the delay times was considered in this work. Finally, predicted results were compared with the measured data md their correlations were analyzed and discussed.

Active Sound Control Approach Using Virtual Microphones for Formation of Quiet Zones at a Chair (좌석의 정음공간 형성을 위한 가상마이크로폰 기반 능동음향제어 기법 연구)

  • Ryu, Seokhoon;Kim, Jeakwan;Lee, Young-Sup
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.9
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    • pp.628-636
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    • 2015
  • In this study, theoretical and experimental analyses were performed for creating and moving the zone of quiet(ZoQ) to the ear location of a sitter by using active sound control technique. As the ZoQ is actively created at the location of the error microphone basically with an active sound control system using an algorithm such as the filtered-x least mean square(FxLMS), the virtual microphone control(VMC) method was considered to move the location of the ZoQ to around the sitter`s ear. A chair system with microphones and loudspeakers on both sides was manufactured for the experiment and thus an active headrest against the swept narrowband noise as the primary noise was implemented with a real-time controller in which the VMC algorithm was embedded. After the control experiment with and without the VMC method, the location variation of the ZoQ by analyzing the error signals measured by the error and the virtual microphones. Therefore, it is observed that the FxLMS with the VMC technique can provide the re-location of the ZoQ from the error microphone location to the virtual microphone location. Also it is found that the amount of the attenuation difference between the two locations was small.

Gaze Matching Based on Multi-microphone for Remote Tele-conference (멀티 마이크로폰 기반 원격지 간 화상회의 시선 일치 기법)

  • Lee, Daeseong;Jo, Dongsik
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.10a
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    • pp.429-431
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    • 2021
  • Recently, as an alternative to replace face-to-face meetings, video conferencing systems between remote locations has increased. However, video conferencing systems have limitations in terms of mismatch of the eyes of remote users. Therefore, it is necessary to apply a technology that can increase the level of immersion in video conferences by matching the gaze information of participants between different remote locations. In this paper, we propose a novel technique to realize video conferencing with the same gaze by estimating the speaker's location based on a multi-microphone. Using our method, it can be applied to various fields such as robot interaction and virtual human interface as well as video conferencing between remote locations.

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Experimental contribution analysis of external aeroacoustic noise sources to interior noise of automobile (자동차 외부 공기음향 소음원들의 실험적 실내 기여도 분석 기술 개발)

  • Lee, Myung Han;Ih, Kang Duck;Hwang, Seongil;Kim, Yong-Joe
    • The Journal of the Acoustical Society of Korea
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    • v.37 no.5
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    • pp.300-308
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    • 2018
  • The contribution analysis of various external aeroacoustic noise sources to interior noise is important, enabling to design an automobile with a low interior noise level. With a new technique, the CD (Cholesky Decomposition), it is proposed to decompose an overall interior noise spectrum into multiple spectra, each representing the contribution of a specific noise source to the interior noise. In order to validate this method, three kinds of experiments were conducted. Furthermore, it is proposed to improve the CD-based contribution analysis method to be integrated with existing exterior microphone arrays in the wind tunnel. This method was validated with an experiment with two speakers.