Patent ID: 8848925
Filing Date: 2014-09-30
Classification: G10L

Abstract:
1. A method comprising: using samples of at least a part of an audio signal of a first channel and a part of an audio signal of a second channel to estimate a time delay between said part of the audio signal of said first channel and said part of the audio signal of said second channel; windowing the samples of said first channel and said second channel by a window function to form an analysis frame of said first channel and an analysis frame of said second channel; performing a time-to-frequency domain transform on the analysis frames to form a frequency domain representation of said part of the audio signal of said first channel and said part of the audio signal of said second channel; determining an inter-channel time delay between said part of the audio signal of the first channel and said part of the audio signal of said second channel on the basis of the frequency domain representations; searching similarities within signals of the first channel and the second channel at each subband; and time aligning the first channel and the second channel to compensate for the determined inter-channel time delay only on such subbands in which said searching similarities indicates that the signal of the first channel and the signal of the second channel can be considered similar enough, wherein said time aligning comprises shifting the second channel in relation to the determined inter-channel time delay.