| The Fully Networked Car, A Workshop on ICT in Vehicles |
A B S T R A C T |
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| Speaker: |
H. W. Gierlich
HEAD acoustics GmbH |
| Session 7-I: |
In-Vehicle devices and Human Machine Interface
(including Voice Interface) |
| Session Moderator: |
Jean-Yves Monfort, Chairman of ITU-T Study Group 12, France Telecom & Jean-Pierre Cheynet, Chairman of ISO TC-22 "Road vehicles", Bureau de Normalisation de l'Automobile |
| Title of Presentation: |
Background Noise Simulation and Hands-Free Testing in a Car: The ETSI STF 273 Project and Its Impact on Car Hands-Free Testing |
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The integration of high quality hands-free systems in a car is a challenging topic: Besides the problems of proper echo control the handling of the background noise in the car under the various driving conditions is of vital importance for the overall speech quality performance of modern hands-free systems. In order to optimize all acoustical and signal processing components used in a car hands-free system (directional microphones, loudspeaker and their positioning, echo cancellers, noise cancellers different types of AGC..) a realistic background noise simulation in a car cabin is required.
Within the ETSI STF 273 project a recording and reproduction technique is developed and standardized which can be used for all types of terminals including car hands-free terminals. The setup allows to reproduce pre-recorded background noise realistically in a car cabin under laboratory conditions. The simulation technique used will be described.
Furthermore selected testing techniques will be described which can be used in conjunction with the background noise simulation in order to evaluate and optimize the performance of hands-free systems with respect to their ability to provide good speech quality performance in the presence of background noise.
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