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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

HMS II.4-33 on Torso Box HTB VI
HMS II.4 is an Artificial Head Measurement System for measuring close-to-the-ear transducers in handsets, headsets, headphones, hearing protectors and hearing aids. By realistically replicating all acoustically relevant structures of the human anatomy, HMS II.4 also allows measurements of far-to-the-ear transducers such as hands-free equipment.
HMS II.4 is equipped with an impedance simulator in the right ear, meeting the requirements in the Recommendations ITU-T P.57 and P.58. If required, the left ear can be equipped likewise.
HMS II.4 is delivered with anatomically shaped pinnae type 3.3 and can be retrofitted with simplified pinnae type 3.4, both according to ITU-T P.57.
In contrast to HMS II.3, HMS II.4 is not equipped with an artificial mouth.

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