Patent ID: 7991176
Filing Date: 2011-08-02
Classification: H04R,H04S

Abstract:
1. A method comprising: receiving a first audio channel and a second audio channel, sampling said first audio channel and said second audio channel at a sampling frequency, equalizing the sampled first audio channel and the sampled second audio channel to form a first equalized channel and a second equalized channel, mixing said first equalized channel with the second equalized channel after the second equalized channel has been delayed, scaled down and inverted, mixing said second equalized channel with the first equalized channel after the first equalized channel has been delayed, scaled down and inverted, by a control unit of a portable device, outputting the mixed first and second channels so as to widen spatial output of at least two closely spaced loudspeakers of said portable device, wherein the widened spatial output creates a spatial effect so that sound generated by said closely spaced loudspeakers has the impression of coming from outside an angle spanned by said loudspeakers, and using a fractional delay of less than one sample of the first and second equalized channels for tuning the delay.