Patent ID: 7313517

Claim:
A method for measuring the transmission quality of an audio transmission system, an input signal (X) being entered into the system, resulting in an output signal (Y), in which both the input signal (X) and the output signal (Y) are processed, comprising the steps of: preprocessing of the input signal (X) and output signal (Y) to obtain pitch power densities (PPX WIRSS (ƒ) n , PPY WIRSS (ƒ) n ) for the respective signals; compensating the pitch power densities for linear frequency response and time varying gain so as to obtain compensated pitch power densities (PPX″ WIRSS (ƒ) n , PPY′ WIRSS (ƒ) n ), wherein the compensation of linear frequency response and time varying gain comprises an iterative loop having at least three compensation calculations, the calculations having a calculation of a first partial compensation of a first type, a calculation of a compensation of a second type, and a calculation of a second partial compensation of the first type, the first type of calculation and the second type of calculation comprising a different one of a calculation of compensation of linear frequency response and a calculation of a local power scaling factor; and computing, in response to compensated pitch power densities (PPX″ WIRSS (ƒ) n , PPY′ WIRSS (ƒ) n ), a score (Q) indicative of transmission quality of the system.