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Generalized cross correlation with phase transform sound source localization combined with steered response power method

조정 응답 파워 방법과 결합된 generalized cross correlation with phase transform 음원 위치 추정

Young-Joon Kim1
,
Min-Jae Oh1
,
In-Sung Lee1*
김 영준1
,
오 민재1
,
이 인성1*
1Department of Radio Cmmunication Engineering, Chungbuk National University
1충북대학교 전파통신공학과
*교신저자. *Corresponding Author. 
30 September 2017. pp. 345-352
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Abstract

We propose a methods which is reducing direction estimation error of sound source in the reverberant and noisy environments. The proposed algorithm divides speech signal into voice and unvoice using VAD. We estimate the direction of source when current frame is voiced. TDOA (Time-Difference of Arrival) between microphone array using the GCC-PHAT (Generalized Cross Correlation with Phase Transform) method will be estimated in that frame. Then, we compare the peak value of cross-correlation of two signals applied to estimated time-delay with other time-delay in time-table in order to improve the accuracy of source location . If the angle of current frame is far different from before and after frame in successive voiced frame, the angle of current frame is replaced with mean value of the estimated angle in before and after frames.

Keywords
Microphone array
GCC-PHAT (Generalized Cross Correlation with Phase Transform)
Sound source localization
TDOA (Time Difference of Anival)
VAD (Voice Activity Detection)

본 논문에서는 잔향과 잡음이 존재하는 실제 환경을 모델링하여 두 개의 마이크로폰을 이용한 음원 위치 추정의 정확성을 향상시키는 방법을 제안하였다. 입력신호에 VAD(Voice Activity Detection)를 적용하여 묵음 구간을 제외한 음성 구간만을 사용하였고, 샘플링 주파수의 제한으로 인한 측정 범위를 벗어나는 프레임은 업샘플링(up-sampling)을 통해 지연시간을 다시 추정하였다. 여기서 계산된 도착 지연 시간은 Time-table을 참조해 주변 후보 위치의 지연 값들과의 비교로 최대 파워 값을 갖는 지연 시간을 선택하여 음원 위치의 정확도를 높였다. 또한 프레임간의 상관성을 이용하여 연속된 음성 프레임의 경우 큰 추정 차가 발생하는 곳을 찾아 주변 프레임의 평균값으로 대체함으로써 음원의 위치 추정 성능을 향상시켰다.

키워드
마이크로폰 어레이
GCC-PHAT (Generalized Cross Correlation with Phase Transform)
음원 위치 추정
도착 지연 시간
음성 구간 검출
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 36
  • No :5
  • Pages :345-352
  • Received Date : 2017-06-19
  • Accepted Date : 2017-09-28
  • DOI :https://doi.org/10.7776/ASK.2017.36.5.345
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