Patent ID: 7024259
Filing Date: 2006-04-04
Classification: H04S

Abstract:
1. A system for evaluating the quality of an audio test signal derived from an audio reference signal by coding and decoding, said audio test signal and said audio reference signal each comprising a plurality of channels, each channel being adapted to be made audible by one loudspeaker of a plurality of loudspeakers which are positioned at different positions in an at least fictitious room, and two listening reference points being defined with respect to the positions of the plurality of loudspeakers, said system comprising: a unit for converting the audio reference signal into a first audio reference sum signal at the first reference point and into a second audio reference sum signal at the second reference point and for converting the audio test signal into a first audio test sum signal at the first reference point and into a second audio test sum signal at the second reference point, wherein the first and the second reference points are different from each other, wherein the unit for converting includes: a unit for evaluating the quality of the audio test sum signals output by the adding devices while taking into consideration the audio reference sum signals output by the adding devices so as to provide an indication of the quality of the audio test signal.