A measurement methodology for automotive teleconferencing

A novel measurement methodology for in-car communication and automotive teleconferencing systems is presented. The procedure consists of several discrete signal acquisition steps and is based on the idea of separating any microphone signal into its three basic additive components: speech, noise, and acoustic system echo. In a simulation stage, previously recorded signal components are mixed with current microphone signals in real time to obtain virtual microphone signals. These are presented to the system under test, which may even be a black box and of non-linear characteristic. Arbitrary combinations of different noise conditions, dialog situations, and systems can be tested. Instrumental measurements are supported as well as third-person listening tests.