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  Artificial Head Systems HMS II - Overview     HMS II.4 - Overview
HMS II.4 (Code 1240) - Artificial Head Measurement System with Ear Simulator
In contrast to    HMS II.3, the Artificial Head Measurement System HMS II.4 is only equipped with an ear simulator but not with an artificial mouth, thus only allowing measurements of communication devices and networks in receiving direction.
The simulation of the head geometry has been reduced to the acoustically relevant structures of the human anatomy and results in a recording technology which corresponds to the acoustical behavior of human test persons under realistic conditions.
HMS II.4 meets the requirements of ITU-T Recommendation P.58 in receiving direction.
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