Design of Double Talk Sequences in Different Languages to Harmonize Third Party Listening Test Results

A Third Party Listening Test was introduced in [1] using pre-recorded conversations in Russian, German and English language to assess and verify the quality of eCall systems (In-vehicle Systems, IVS). The language comparison shall verify the possibility for IVS manufacturers to optimize performance of their systems for homologation tests according to MGS R55531 [2] in different languages. First tests lead to similar results for Russian, English and German recordings for most of the tested devices and parameters [1]. Only for particular devices ambiguous results were found under double talk conditions. The double talk rating was more critical for the German language due to higher speech activity in downlink direction. Thus, the timing of uplink and downlink signals during double talk was adapted for the German sequence. The test was repeated in all three languages. The adapted speech sequences and the results of the recent listening test are presented.