| 摘要 |
For measuring the influence of echo on the perceptual quality on the talker's side of a telephone link in a telecommunications network, a talker speech signal (s(t)) and a combined signal (s'(t)) are fed to an objective measurement device (32), such as a PSQM system, for obtaining an output signal (q(t)) representing an estimated value of the perceptual quality. The combined signal is obtained in a signal combiner (34) by signal combination of a returned signal (r(t)) originating from the network and corresponding to the speech signal, and the speech signal (s(t)). The measuring method is applicable to speech signals laid down in a data base, but also to signals directly obtained from a telephone-link circuit, the output signal being fed to a quality-control system and/or to an echo-minimising device. |
