HMS II.7 – Fullband artificial head with free-field ICP® microphones

HMS II.7 is the fullband artificial head equipped with two low-noise free-field ICP®... 

HMS II.7 is the fullband artificial head equipped with two low-noise free-field ICP® microphones (left and right ear) and a two-way mouth loudspeaker. Therefore, the artificial head supports measurements in sending and receiving direction.

The the freefied-optimized artificial ears are equipped with pre-polarized ½” microphones  providing a self-noise level of 15.5 dBSPL(A). In combination with an upper sound pressure level limit of 135 dBSPL, HMS II.7 covers most hands-free application measurements. The  artificial mouth reproduces the complete spectrum of human voice, allowing narrowband, wideband, super-wideband and even fullband measurements. 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. With HMS II.7, users can create aurally-accurate voice and audio recordings for analysis with the measurement and analysis software ACQUA.

HMS II.7 is ideally suited for all acoustical far-from-the-ear measurements of voice and audio quality. This includes automotive hands-free devices, smart speaker or conference phones. Since no impedance simulation is conducted, HMS II.7 is not suited for measurements of sound sources close-to-the-ear such as headphones, headsets, and handsets.

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HMS II.7 is the fullband artificial head equipped with two low-noise free-field ICP® microphones (left and right ear) and a two-way mouth loudspeaker. Therefore, the artificial head supports measurements in sending and receiving direction.

The the freefied-optimized artificial ears are... 

HMS II.7 is the fullband artificial head equipped with two low-noise free-field ICP® microphones (left and right ear) and a two-way mouth loudspeaker. Therefore, the artificial head supports measurements in sending and receiving direction.

The the freefied-optimized artificial ears are equipped with pre-polarized ½” microphones  providing a self-noise level of 15.5 dBSPL(A). In combination with an upper sound pressure level limit of 135 dBSPL, HMS II.7 covers most hands-free application measurements. The  artificial mouth reproduces the complete spectrum of human voice, allowing narrowband, wideband, super-wideband and even fullband measurements. 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. With HMS II.7, users can create aurally-accurate voice and audio recordings for analysis with the measurement and analysis software ACQUA.

HMS II.7 is ideally suited for all acoustical far-from-the-ear measurements of voice and audio quality. This includes automotive hands-free devices, smart speaker or conference phones. Since no impedance simulation is conducted, HMS II.7 is not suited for measurements of sound sources close-to-the-ear such as headphones, headsets, and handsets.

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Highlights

  • HMS II.7 is equipped with two low-noise free-field ICP® microphones for binaural measurements
  • The artificial head enables testing close to or below the hearing threshold
  • HMS II.7 is suitable for far-from-the-ear measurements in sending and receiving direction
  • The artificial mouth and geometrical dimensions of HMS II.7 are compliant with recommendation ITU-T P.58

Applications

  • Free-field measurements in sending and receiving direction of sound sources far-from-the-ear
  • Voice quality and audio quality testing 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

Artificial free-field ears:

  • HMS II.7 is equipped with simplified pinna simulator and two high-sensitivity, low-noise binaural free-field ICP® microphones
  • The build-in ½” microphones provide an inherent noise level of typically 15.5 dBSPL(A) and allow conclusive measurements close to or below the hearing threshold
  • The upper sound pressure level limit of 135 dBSPL ensures full usability of HMS II.7 for measurements at medium and high levels
  • The artificial ears provide a transmission range from 3.5 Hz to 20 kHz

 

 

 

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
     
  • Depending on the application, users can mount the artificial head on the height-adjustable tripod HMT III or on the torso box HTB VI