HMS II.5 - Fullband artificial head for measurements in sending direction only

HMS II.5 is the fullband artificial head for voice and audio quality measurements in...

HMS II.5 is the fullband artificial head for voice and audio quality measurements in sending direction only. It is ideally suited for testing far-to-the-ear communication devices like hands-free systems or smart speakers. The head and torso simulator provides geometric and acoustic characteristics according to recommendation ITU-T P.58 and thus replicates all acoustically relevant structures of the human anatomy.

HMS II.5 supports measurements in sending direction only and therefore is equipped with a fullband low-distortion two-way mouth loudspeaker, but no occluded ear simulator. The artificial mouth reproduces the complete spectrum of human voice, allowing narrowband, wideband, super-wideband and even fullband measurements.

HMS II.5 is characterized by the newly introduced modular concept, which applies to all HEAD acoustics artificial heads in the field of communication and audio testing. From now on, it is possible to use one artificial head for altering applications. Users can quickly and easily change occluded ear simulators and pinnae to HMS II.5 based on their measurement task.

HMS II.5 is ideally suited for fullband measurements of far-to-the-ear audio and communication devices in sending direction only.
The artificial head complies with recommendation ITU-T P.58 regarding its geometric and acoustic characteristics.
Modular concept allows to adapt HMS II.5 quickly and easily to altering measurement tasks.

Two artificial heads in application mode.

Applications

Voice quality and audio quality measurements in sending direction of e.g.:
- In-vehicle applications like hands-free terminals, in-car communication (ICC) systems, infotainment systems, emergency call (eCall) devices.
- Voice-controlled smart home devices like smart speakers and other IoT devices.
- Conference phones and hands-free devices.

Features

The artificial mouth with its two-way loudspeaker design transmits equalized speech signals from 50 Hz up to 20 kHz – from narrowband to fullband.
The two-way mouth simulator of the artificial head also reproduces high speech levels with low distortion.
Acoustic properties of the two-way mouth exceed the requirements of the recommendation ITU-T P.58.
Automated and comfortable equalization of the two-way mouth simulator is supported in the measurement and analysis software ACQUA.
Due to its modular concept, HMS II.5 can be retrofitted with artificial ears for measurements in receiving direction and thus fits altering measurement tasks:
- Available variants of the occluded ear simulator are:
  - Low-noise occluded ear simulators that feature an impedance response matched to that of the human ear for the right ear (HIS R LN HEC) and for the left ear (HIS L LN HEC)
  - Low-noise occluded ear simulators for the right ear (HIS R LN) and for the left ear (HIS L LN)
  - Occluded ear simulators for the right ear (HIS R) and for the left ear (HIS L) complying with IEC 60318-4
- Pinna: HMS II.5 is equipped with two anatomically shaped pinnae (ITU-T type 3.3) and can be retrofitted with simplified pinnae (ITU-T type 3.4). Also, human-like designed pinnae (ITU-T type 4.4) that models the section leading into the realistic ear canal are available.
HMS II.5 can be equipped with an artificial nose (AN-HMS); it enables acoustic measurements of audio and communication devices where a nose ensures secure hold of various devices (e.g. augmented reality glasses, virtual reality headsets).
The height-adjustable tripod HMT III or the torso box HTB VI are different mounting solutions for the artificial head.