Blind compensation of inter-channel sampling frequency mismatch with maximum likelihood estimation in STFT domain
Blind compensation of inter-channel sampling frequency mismatch with maximum likelihood estimation in STFT domain
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DOI：
10.1109/icassp.2013.6637733
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发表时间：
2013-05
期刊：
影响因子：
--
通讯作者：
S. Miyabe;Nobutaka Ono;S. Makino
中科院分区：
文献类型：
--
作者：
S. Miyabe;Nobutaka Ono;S. Makino
提出了一种新的异步麦克风阵列采样频率失配的盲补偿方法。不同记录设备同时观测到的数字信号，由于设备间采样频率的不匹配，观测通道间的时间差会发生漂移。基于这样的时间差在每个时间帧内是恒定的，但与时间帧索引成比例地变化的模型，可以通过线性相移在短时傅立叶变换域中补偿采样频率失配的影响。通过假设源是静止的和静止的，采样频率失配的可能性被公式化。最大似然估计是通过黄金分割搜索得到的。
This paper proposes a novel blind compensation of sampling frequency mismatch for asynchronous microphone array. Digital signals simultaneously observed by different recording devices have drift of the time differences between the observation channels because of the sampling frequency mismatch among the devices. Based on the model that such the time difference is constant within each time frame, but varies proportional to the time frame index, the effect of the sampling frequency mismatch can be compensated in the short-time Fourier transform domain by the linear phase shift. By assuming the sources are motionless and stationary, a likelihood of the sampling frequency mismatch is formulated. The maximum likelihood estimation is obtained effectively by a golden section search.