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A study on digital sound reception systems for ships

선박용 디지털 음향수신장치 연구

  • Kim, Hyungjong (ASRI, Department of Electrical and Computer Engineering, Seoul National University) ;
  • Kim, Jeongchang (Department of Electronics and Communications Engineering, Korea Maritime and Ocean University)
  • Received : 2014.07.23
  • Accepted : 2014.10.31
  • Published : 2014.11.30

Abstract

In this paper, we propose a sound reception system against surrounding noise for ships based on digital signal processing technologies. In order to suppress unwanted surrounding noises, a digital band-pass filter is designed, which the pass-band of the filter is between 70Hz to 820Hz. Also, we develope a sound direction indicating algorithm with 4 microphones. After filtering the audio signals from 4 microphones, the developed sound direction indicating algorithm can indicate 8 directions. In addition, we implement prototype board for the sound reception using a digital signal processor chip and audio codecs, and verify the proposed algorithm.

본 논문에서는 디지털 신호처리 기술에 기반하여 주변잡음에 강건한 선박용 음향수신장치를 제안한다. 원하지 않는 주변 잡음을 억제하기 위하여 70Hz-820Hz의 통과대역을 갖는 디지털 대역통과 필터를 적용한다. 4개의 마이크로폰으로부터 입력된 음향 신호들이 디지털 대역통과 필터를 거친 후 8 방향의 방향 탐지가 가능한 방향 탐지 알고리즘을 제안한다. 또한, DSP 칩과 오디오 코덱을 이용한 프로토타입 시스템을 구현하여 본 알고리즘의 동작을 테스트한다.

Keywords

References

  1. SOLAS chapter V safety of navigation - Regulation 19 -Carriage requirements for shipborne navigational systems and equipment, https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/343175/solas_v_on_safety_of_navigation.pdf, Accessed July1, 2002.
  2. IMO resolution MSC.86(70) - Adoption of new and amended performance standards for navigational equipment, http://www.imo.org/blast/blastDataHelper.asp?data_id=15454&filename=86(70).pdf, Accessed Dec. 8, 1998.
  3. ISO 14859 - Ships and marine technology - Sound reception systems, https://www.iso.org/obp/ui/#iso:std:iso:14859:ed-1:v1:en, Accessed April 1, 2012.
  4. J. W. Choi and K. J. Kim, "A new sound reception system using a symmetrical microphone array and its numerical simulation," Journal of Ship & Ocean Technology, vol. 8, no. 3, pp. 18-25, 2004.

Cited by

  1. 기적신호의 스펙트럼 분석을 통한 음향수신장치의 방향탐지 알고리즘 설계 및 분석 vol.41, pp.1, 2017, https://doi.org/10.5916/jkosme.2017.41.1.83
  2. 선박의 음향수신장치를 위한 주파수 검출 및 위상 차이를 이용한 방향 탐지 알고리즘 vol.43, pp.7, 2014, https://doi.org/10.7840/kics.2018.43.7.1197
  3. Sound reception system by an acoustic meta-lens vol.5, pp.2, 2021, https://doi.org/10.1080/25725084.2021.1923933