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논문 상세정보

고품질 음성 취득을 위한 Small-Aper ture 적응 마이크로폰 어레이 시스템

Small-Aperture Adaptive Microphone Array System for High Quality Speech Acquisition

초록

본 논문에서는 개인용 컴퓨터를 기반으로 한 실시간 마이크로폰 어레이 시스템을 제안한다. 제안한 시스템은 Generalized Sidelobe Canceller (GSC) 를 기반으로 하며, 새로운 적응 모드 제어기 (adaptation mode controller) 를 이용함을 특징으로 한다. 제안한 마이크로폰 어레이 시스템의 성능 평가를 위해, 일반 가정의 거실을 모델링한 실험 환경을 구축하여 실험을 수행하였다. 실험을 통해 제안된 시스템이 안정적으로 GSC의 적응 모드를 제어하고, 목적 신호의 왜곡을 최소화하면서도 간섭 신호 제거 성능이 뛰어남을 확인하였다.

Abstract

In this paper, a PC-based real-time microphone array system with small aperture is presented. The microphone array system is based on the generalized sidelobe canceler (GSC) but it employs a new adaptation mode controller (AMC). The performance of the proposed system was evaluated in the Multimedia Room modeled on an office situation. Evaluation experiments show that the proposed system can perform with stable noise suppression.

본문요약 

제안 방법
  • In this paper, we focus on the realization of the adaptive microphone array system with a small number of sensors and size, which is suitable for a hand-held device.

    Research into a small-aperture microphone array system using the GSC algorithm is thus required to address these drawbacks, enabling the advantages of microphone arrays to be exploited in practical systems. In this paper, we focus on the realization of the adaptive microphone array system with a small number of sensors and size, which is suitable for a hand-held device. The paper is organized as follows: In Section II we cover the implementation issues related to the small-aperture microphone array on a hand-held device.

  • To assess tracking capability an experiment to test moving interference was performed.

    To assess tracking capability an experiment to test moving interference was performed. In this experiment the speaker started moving from the 0° position to the 90° position; the speaker also stopped once at 45° for 2 seconds during the experiment.

대상 데이터
  • The acquisition system consisted of four linearly spaced omni-directional microphones with inter-element spacing of 2cm and an 8-channel A/D board.

    3-(a) was used for microphone array recordings. The acquisition system consisted of four linearly spaced omni-directional microphones with inter-element spacing of 2cm and an 8-channel A/D board. The total aperture size of the microphone array is only 6cm, so this makes the microphone array system applicable to a hand-held device.

  • The target signal source comprised four sentences from the Texas Instruments and Massachusetts Institute of Technology (TIMIT) database and the interference signal was speech from the TIMIT database and various music signals.

    5m, 90°) with the interference signal at (1m, 30°) in a polar coordinate system. The target signal source comprised four sentences from the Texas Instruments and Massachusetts Institute of Technology (TIMIT) database and the interference signal was speech from the TIMIT database and various music signals. The SINR was varied from -10 to 10 dB.

이론/모형
  • Because of these problems, we chose the generalized sidelobe canceller (GSC) as an adaptive beamforming algorithm.

    In addition, the mobility of hand-held devices causes high variability in acoustic conditions. Because of these problems, we chose the generalized sidelobe canceller (GSC) as an adaptive beamforming algorithm. The GSC is widely used for a microphone array algorithm because of its computational efficiency and ability to suppress interference [1][2].

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