CPC G10L 19/008 (2013.01) [G10L 19/02 (2013.01); G10L 19/022 (2013.01); G10L 19/04 (2013.01); G10L 25/18 (2013.01); H04S 3/008 (2013.01); H04S 2400/01 (2013.01); H04S 2400/03 (2013.01); H04S 2420/03 (2013.01)] | 13 Claims |
1. An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, comprising:
a calculator configured for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block;
a spectral characteristic estimator configured for estimating a spectral characteristic of a spectrum of the first channel signal for the time block or the second channel signal for the time block;
a smoothing filter configured for smoothing the cross-correlation spectrum over time using the spectral characteristic to acquire a smoothed cross-correlation spectrum; and
a processor configured for processing the smoothed cross-correlation spectrum to acquire the inter-channel time difference.
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