Patent Document ID: 20140324419
Application ID: 14358732
Patent Status: 0

Claim One:
1. Method of evaluating intelligibility of a degraded speech signal received from an audio transmission system, by conveying through said audio transmission system a reference speech signal such as to provide said degraded speech signal, wherein the method comprises: sampling said reference speech signal into a plurality of reference signal frames and determining for each frame a reference signal representation; sampling said degraded speech signal into a plurality of degraded signal frames and determining for each frame a degraded signal representation; forming frame pairs by associating said reference signal frames and said degraded signal frames with each other, and providing for each frame pair a difference function representing a difference between said degraded signal frame and said associated reference signal frame; compensating said difference function for one or more disturbance types such as to provide for each frame pair a disturbance density function which is adapted to a human auditory perception model; deriving from said disturbance density functions of a plurality of frame pairs an overall quality parameter, said quality parameter being at least indicative of said intelligibility of said degraded speech signal; wherein, said method further comprises the steps of: determining a loudness value for each of said reference signal frames; and determining a weighting value dependent on said loudness value of said reference signal frame; wherein said step of compensating of said difference function comprises a step of weighing said difference function using said loudness dependent weighting value, for incorporating an impact of disturbance on said intelligibility of said degraded speech signal into said evaluation.