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  Artificial Head Systems HMS II - Overview     HMS II.5 - Overview
HMS II.5 (Code 1388) - Artificial Head Measurement System with Mouth Simulator
In contrast to    HMS II.3, the Artificial HEAD Measurement System HMS II.5 is only equipped with an artificial mouth but not with an ear simulator, thus serving purely as a speech simulation system for measurements in sending direction.
HMS II.5 meets the requirements of ITU-T Recommendation P.58 in sending direction. The simulation of the head geometry has been reduced to the acoustically relevant structures of the human anatomy and results in a playback technology which corresponds to the acoustical behavior of human test persons under realistic conditions.
HMS II.5 can be extended by ear simulators according to IEC 60318-4 on both sides, thus allowing measurements in receiving direction as well (corresponding to    HMS II.3).
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