Method and system for speech intelligibility measurement of an audio transmission system

摘要

Method and processing system for measuring the intelligibility of a degraded output signal ( Y(t) ) from an audio transmission system (10) in response to a reference input signal ( X(t) ). A measurement device (11) is arranged for outputting a measure (I) for the speech intelligibility of the output signal ( Y(t) ). The measurement device (11) executes processing of the input signal (X(t)) and output signal (Y(t)) to obtain a disturbance density function ( D(f) n ). The disturbance density function ( D(f) n ) is corrected by multiplying it with a correction function for each frame derived from a correlation calculation of the compensated pitch power densities ( PPX'(f) n ) associated with the input signal ( X(t) ) of a present frame ( n ) and an independent previous frame ( n-2 ). The corrected disturbance density function ( D'(f) n ) is aggregated over frequency and time to obtain a measure (I) for the speech intelligibility of the output signal ( Y(t) ).