HMS II.3-LN – Fullband artificial head with very low inherent noise

The fullband artificial head measurement system HMS II.3-LN allows low-noise... 

The fullband artificial head measurement system HMS II.3-LN allows low-noise measurements especially of close-to-the-ear sound sources. Ear simulators with highly sensitive microphones ensure very low inherent noise (16 dBSPL(A)) with this artificial head variant. This makes HMS II.3-LN the ideal choice for assessing the quality of Active Noise Cancellation (ANC) headsets, headphones, and other close-to-the-ear audio and communication equipment. In addition to its very low inherent noise, HMS II.3-LN is characterized by the fact that it measures levels up to 148 dBSPL – which results in a high dynamic range.

The combination of these two features makes HMS II.3-LN suitable for measuring very low and high levels. As a result, the artificial head enables measurements of far-to-the-ear communication devices like hands-free systems or smart speaker.

The artificial head realistically replicates all acoustically relevant structures of the human anatomy. HMS II.3-LN enables measurements in sending and receiving direction: While a low-noise impedance simulator in the right ear of the artificial head simulates 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 the ear simulators, HMS II.3-LN is capable of creating aurally-accurate voice and audio recordings for evaluation with the measurement and analysis software ACQUA.

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The fullband artificial head measurement system HMS II.3-LN allows low-noise measurements especially of close-to-the-ear sound sources. Ear simulators with highly sensitive microphones ensure very low inherent noise (16 dBSPL(A)) with this artificial head variant. This makes HMS II.3-LN... 

The fullband artificial head measurement system HMS II.3-LN allows low-noise measurements especially of close-to-the-ear sound sources. Ear simulators with highly sensitive microphones ensure very low inherent noise (16 dBSPL(A)) with this artificial head variant. This makes HMS II.3-LN the ideal choice for assessing the quality of Active Noise Cancellation (ANC) headsets, headphones, and other close-to-the-ear audio and communication equipment. In addition to its very low inherent noise, HMS II.3-LN is characterized by the fact that it measures levels up to 148 dBSPL – which results in a high dynamic range.

The combination of these two features makes HMS II.3-LN suitable for measuring very low and high levels. As a result, the artificial head enables measurements of far-to-the-ear communication devices like hands-free systems or smart speaker.

The artificial head realistically replicates all acoustically relevant structures of the human anatomy. HMS II.3-LN enables measurements in sending and receiving direction: While a low-noise impedance simulator in the right ear of the artificial head simulates 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 the ear simulators, HMS II.3-LN is capable of creating aurally-accurate voice and audio recordings for evaluation with the measurement and analysis software ACQUA.

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Highlights

  • Due to its low-noise capability of 16 dBSPL(A), HMS II.3-LN is especially suited e.g. for testing ANC headphones and headsets - the maximum sound pressure level is 148 dBSPL
  • The low-noise artificial head is suitable for aurally-accurate super-wideband and fullband measurements in sending and receiving direction
  • HMS II.3-LN enables binaural recordings to evaluate acoustic scenes (requires optional impedance simulator HIS L-LN for the left ear)
  • HMS II.3-LN complies with recommendation ITU-T P.58 and is based on ITU-T P.57 and IEC 60318-4

Applications

  • Self-noise measurements of audio devices
  • 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

Features

  • HMS II.3-LN is equipped with a two-way artificial mouth as well as a low-noise impedance simulator for the right ear (HIS R-LN) – optionally, it is possible to add an low-noise ear simulator for the left ear (HIS L-LN)
  • The ear simulators of the artificial head cover a transmission range from 3 Hz to 20 kHz
  • HMS II.3-LN transmits equalized speech signals from 50 Hz up to 20 kHz
  • The mouth simulator of the artificial head also reproduces high speech levels with low distortion
  • Automated and comfortable equalization of the two-way mouth simulator is supported in the measurement and analysis software ACQUA
  • HMS II.3-LN is available with the anatomically shaped pinna simulator (type 3.3) or with the simplified pinna simulator (type 3.4)
  • The artificial head 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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