Patent ID: 8335330
Filing Date: 2012-12-18
Classification: H04S

Abstract:
1. A method of up-mixing audio signals comprising: determining a level of panning between first and second audio signals, wherein the level of panning is considered hard if the first and second audio signals are essentially uncorrelated; introducing cross-talk between the first and second audio signals thereby generating two new first and second audio signals; filtering the first new audio signal, where the filtering includes use of a first set of filtering coefficients generating a filtered first audio signal; time-shifting the second new audio signal, where the second new audio signal is time-shifted with respect to the filtered first audio signal generating a shifted second audio signal; determining a first difference between the filtered first audio signal and the shifted second audio signal, where the first difference is an up-mixed audio signal; adjusting the first set of filtering coefficients so that the first difference is essentially orthogonal to the first audio signal; and wherein introducing cross-talk comprises adjusting the introduced cross-talk based on the determined level of panning to improve up-mixing quality.