Patent ID: 6271771
Filing Date: 2001-08-07
Classification: G10L,H04S

Abstract:
A method of performing a hearing-adapted quality assessment of an audio test signal derived from an audio reference signal by coding and decoding, comprising the following steps:breaking down the audio test signal in accordance with its spectral composition into partial audio test signals by means of a first bank of filters consisting of filters overlapping in frequency and defining spectral regions, said filters having differing filter functions which are each determined on the basis of the excitation curves of the human ear at the respective filter center frequency, with an excitation curve of the human ear at a filter center frequency being dependent upon the sound pressure level of an audio signal supplied to the ear;breaking down the audio reference signal in accordance with its spectral composition into partial audio reference signals by means of the first bank of filters or a second bank of filters coinciding with the first bank of filters;forming the level difference, by spectral regions, between the partial audio test signals and the partial audio reference signals belonging to the same spectral regions; anddetermining, by spectral regions, a detection probability for detecting a coding error of the audio test signal in the particular spectral region on the basis of the respective level difference, the detection probability simulating the probability that a level difference between a partial audio reference signal and a partial audio test signal is sensed by the human brain.