Patent ID: 7333865
Filing Date: 2008-02-19
Classification: G10L

Abstract:
1. A method for aligning first and second sets of audiovisual data, each of the first and second sets of audiovisual data including a set of audio data and a set of visual data aligned with respect to each other, each set of audio data having a first resolution that is higher than a second resolution of the corresponding set of visual data, the method comprising the steps of: computing a magnitude-only spectrogram for each of the sets of audio data of the first and second sets of audiovisual data, using a spectrogram slice length that is appropriate for the stationarity characteristics of the sets of audio data of the first and second sets of audiovisual data and a spectrogram step size that is appropriate for the quantization period of the final alignment; computing a one dimensional cross-correlation of the magnitude-only spectrograms for the sets of audio data of the first and second sets of audiovisual data; and selecting an alignment of the sets of audio data, and, consequently, the first and second sets of audiovisual data, at the second resolution, based on the cross-correlation.