ITU-T P.1120 PDF

This Recommendation provides speech transmission performance and design guidance for automotive hands-free systems that operate around super-wideband (50-14,000Hz) and/or fullband (20-20,000Hz) audio bandwidths and in the future will support stereo telephony. This Recommendation covers:

– built in hands-free systems,

– aftermarket hands-free car kits,

– corded headsets, and

– wireless headsets,

to be used in motor vehicles for communication.

For testing purposes, the test set-up and the recommended environmental conditions are described.

The methods, the analysis and the performance parameters described in this Recommendation are based on test signals and test procedures, as defined in [ITU-T P.501], [ITU-T P.502], [ITU-T P.340], [ITU-T P.380], and [ITU-T P.581].

This Recommendation takes into account the concept of different acoustic zones targeted to different user positions in the car, other than just the driver's position.

Guidance is provided on the system level (i.e., mouth/ear-to-network reference point). For testing purposes, the test set-up and the recommended environmental conditions are described.

Subjective (i.e., perceptual) testing for validating a design under real life condition is provided in this Recommendation.