HMS II.3 LN HEC – Fullband artificial head with very low inherent noise and a human-like ear canal

HMS II.3 LN HEC is a fullband-capable artificial head measurement system with... 

HMS II.3 LN HEC is a fullband-capable artificial head measurement system with anatomically correct replication of the ear. The low-noise occluded ear simulators feature an impedance response matched to that of the human ear. The built-in highly sensitive microphones provide a best-in-class dynamic range: The very low inherent noise of 16 dBSPL(A) makes the head and torso simulator the ideal choice for measuring close-to-the-ear and in-ear audio and communication equipment. Due to the maximum sound pressure level of 148 dBSPL, the artificial head is also suitable for measurements of far-to-the-ear transducers in hands-free systems, in-car communication systems or smart speaker. 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.3 LN HEC enables measurements in sending and receiving direction: While the low-noise occluded ear simulators of the artificial head simulate the receiving direction, a two-way mouth loudspeaker reproduces the complete spectrum of the human voice. This allows narrowband, wideband, super-wideband and fullband measurements to be conducted. With HMS II.3 LN HEC, users can create aurally-accurate voice and audio recordings for evaluation with the measurement and analysis software ACQUA.

HMS II.3 LN HEC 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 based on their measurement task.

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HMS II.3 LN HEC is a fullband-capable artificial head measurement system with anatomically correct replication of the ear. The low-noise occluded ear simulators feature an impedance response matched to that of the human ear. The built-in highly sensitive microphones provide a... 

HMS II.3 LN HEC is a fullband-capable artificial head measurement system with anatomically correct replication of the ear. The low-noise occluded ear simulators feature an impedance response matched to that of the human ear. The built-in highly sensitive microphones provide a best-in-class dynamic range: The very low inherent noise of 16 dBSPL(A) makes the head and torso simulator the ideal choice for measuring close-to-the-ear and in-ear audio and communication equipment. Due to the maximum sound pressure level of 148 dBSPL, the artificial head is also suitable for measurements of far-to-the-ear transducers in hands-free systems, in-car communication systems or smart speaker. 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.3 LN HEC enables measurements in sending and receiving direction: While the low-noise occluded ear simulators of the artificial head simulate the receiving direction, a two-way mouth loudspeaker reproduces the complete spectrum of the human voice. This allows narrowband, wideband, super-wideband and fullband measurements to be conducted. With HMS II.3 LN HEC, users can create aurally-accurate voice and audio recordings for evaluation with the measurement and analysis software ACQUA.

HMS II.3 LN HEC 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 based on their measurement task.

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Highlights

  • HMS II.3 LN HEC is especially suited for aurally accurate testing close-to-the-ear and in-ear transducers in e.g. ANC headphones and headsets, handsets, and hearing aids
  • The artificial head is equipped with a low-noise occluded ear simulator, pinnae with a human-like ear canal and a fullband mouth with a two-way loudspeaker design
  • HMS II.3 LN HEC enables binaural recordings to evaluate acoustic scenarios (requires optional low-noise occluded ear simulator HIS L LN HEC for the left ear)
  • Modular concept allows to adapt the artificial head quickly and easily to altering measurement tasks

Applications

  • High precision and more human-like voice quality and audio quality testing of e.g.:
    • Mobile phones and handsets
    • Headsets, headphones like in-ear buds, and wearables – with and without Active Noise Cancellation (ANC)
    • Hearing aids and active/passive hearing protection
    • 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
  • Self-noise measurements of audio devices
  • Idle noise measurements in ANC devices (e.g. headsets, headphones)
  • Assessment of background noise level in quiet acoustic environments (e.g. semi-anechoic chambers, optimized offices)

Features

Artificial ears:

  • HMS II.3 LN HEC is equipped with a low-noise occluded ear simulator and pinnae with a human-like ear canal in the right ear (HIS R LN HEC) - optionally, it is possible to add the same occluded ear simulator in the left ear (HIS L LN HEC)
  • Due to its modular concept, HMS II.3 LN HEC is configurable as desired to fit altering measurement tasks:
    • Further variants of the occluded ear simulator are available:
      • 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.3 LN HEC is equipped with two human-like designed pinnae (type 4.3 up to reference plane) that models the section leading into the realistic ear canal. Also, anatomically shaped pinnae (type 3.3) and simplified pinnae (type 3.4) are available
  • The artificial ears provide a transmission range from 3 Hz to 20 kHz
  • Transfer impedance complies with type 4.3 ear simulation laid out in recommendation ITU-T P.57 above 100 Hz

Artificial mouth:

  • 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
  • HMS II.3 LN HEC 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

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