| 摘要 |
<p>In an apparatus for objective perceptual evaluation of speech quality, parameters BandwidthRef and BandwidthTest representing the bandwidth are forwarded to a calculator 30 for calculating the relative bandwidth difference ?BW between a reference signal and a test signal. ?BW is forwarded to a calculator 32, which determines the value of a weighting parameter a. Preferably a scaling unit 33 scales or normalizes the disturbance density D and the asymmetric disturbance density DA, for example to the range [0,1]. The values of ?BW and a are forwarded to a bandwidth compensator 34, which also receives the preferably scaled disturbance densityD and asymmetric disturbance density DA. The bandwidth compensated disturbance densities D*, DA* are forwarded to a linear combiner 42, which forms a score representing predicted quality of the test signal.</p> |
