TY - GEN
T1 - Optimizing frame analysis with non-integrer shift for sampling mismatch compensation of long recording
AU - Miyabe, Shigeki
AU - Ono, Nobutaka
AU - Makino, Shoji
PY - 2013
Y1 - 2013
N2 - This paper proposes a blind synchronization of ad-hoc microphone array in the short-time Fourier transform (STFT) domain with the optimized frame analysis centered at non-integer discrete time. We show that the drift caused by sampling frequency mismatch of asynchronous observation channels can be disregarded in a short interval. Utilizing this property, the sampling frequency mismatch and the recording start offset are estimated roughly by finding two pairs of the short intervals corresponding to the same continuous time. Using the estimate, STFT analysis is synchronized roughly between channels with optimized frame central. Since the optimized frame central is generally non-integer, we approximate the frame analysis by the linear phase filtering of the frame centered at the nearest integer sample. Maximum likelihood estimation refines the compensation of sampling frequency mismatch.
AB - This paper proposes a blind synchronization of ad-hoc microphone array in the short-time Fourier transform (STFT) domain with the optimized frame analysis centered at non-integer discrete time. We show that the drift caused by sampling frequency mismatch of asynchronous observation channels can be disregarded in a short interval. Utilizing this property, the sampling frequency mismatch and the recording start offset are estimated roughly by finding two pairs of the short intervals corresponding to the same continuous time. Using the estimate, STFT analysis is synchronized roughly between channels with optimized frame central. Since the optimized frame central is generally non-integer, we approximate the frame analysis by the linear phase filtering of the frame centered at the nearest integer sample. Maximum likelihood estimation refines the compensation of sampling frequency mismatch.
KW - Ad-hoc microphone array
KW - blind source separation
KW - maximum likelihood estimation
KW - sampling frequency
UR - http://www.scopus.com/inward/record.url?scp=84893581721&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84893581721&partnerID=8YFLogxK
U2 - 10.1109/WASPAA.2013.6701833
DO - 10.1109/WASPAA.2013.6701833
M3 - Conference contribution
AN - SCOPUS:84893581721
SN - 9781479909728
T3 - IEEE Workshop on Applications of Signal Processing to Audio and Acoustics
BT - 2013 IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, WASPAA 2013
T2 - 2013 14th IEEE Workshop on Applications of Signal Processing to Audio and Acoustics, WASPAA 2013
Y2 - 20 October 2013 through 23 October 2013
ER -