This Recommendation¹ describes communication requirements for an in-car communication (ICC) system that utilizes integrated microphones and speakers in the motor vehicle cabin to amplify conversation and which is aimed at providing an improved communication between all occupants in a motor vehicle.

This Recommendation sets base levels of function and quality to ensure that the ICC operates to a quality such that the motor vehicle driver does not feel it necessary to turn their head to amplify their voice when talking to other passengers. This can, for example, aid in preventing driver distraction.

To meet these requirements, the use of audio zones within a motor vehicle cabin for speech communications between audio zones, and tests to ensure good speech intelligibility and quality between those zones are defined. This Recommendation covers requirements and test methods for:

1) system stability;

2) speech intelligibility;

3) speech quality;

4) talker localization accuracy.

The use of wearable headphones (audiophones) by driver or passengers is outside the scope of this Recommendation.

¹ This Recommendation includes an electronic attachment containing the concatenated test signals specified in clause 8.4.2.