Reference airborne microphone

Reference

The reference of the air conduction microphone is Shure WH20XLR.

This microphone is available for sale at Thomann. The technical documentation can be found here.

Rigid in-ear microphone

Reference

This rigid in-ear microphone is integrated into the Acoustically Transparent Earpieces product manufactured by the German company inear.de.

Technical details are given in AES publication by Denk et al. : A one-size-fits-all earpiece with multiple microphones and drivers for hearing device research.

For the VibraVox dataset, we only used the Knowles SPH1642HT5H-1 top-port MEMS in-ear microphone, the technical documentation for which is available at Knowles.

Soft in-ear microphone

Reference

This microphone is a prototype produced jointly by the Cotral company, the ISL (Institut franco-allemand de recherches de Saint-Louis) and the LMSSC (Laboratoire de Mécanique des Structures et des Systèmes Couplés). It consists of an Alvis mk5 earmold combined with a STMicroelectronics MP34DT01 microphone. Several measures were taken to ensure optimum acoustic sealing for the in-ear microphone, in order to select the most suitable earmold.

Pre-amplification

This microphone required a pre-amplification circuit.

Laryngophone

Reference

The reference of the throat microphone is Dual Transponder Throat Microphone - 3.5mm (1/8") Connector - XVTM822D-D35 manufactured by ixRadio. This microphone is available for sale on ixRadio.

Forehead accelerometer

Reference

To offer a wide variety of body-conduction microphones, we incorporated a Knowles BU23173-000 accelerometer positioned on the forehead and secured in place with a custom 3D-printed headband.

Pre-amplification

A dedicated preamplifier was developed for this particular sensor.

Hold in position

The designed headband is inspired by a headlamp design. A custom 3D-printed piece was necessary to accommodate the sensor to the headband.

Temple vibration pickup

Reference

The reference of the temple contact microphone is C411 manufactured by AKG. This microphone is available for sale on thomann. It is typically used for string instruments but the VibraVox project will use it as a bone conduction microphone.

Hold in position

This microphone was positioned on the temple using a custom 3D-printed piece. The design of this piece was based on a 3D scan of the Aftershokz helmet, with necessary modifications made to accommodate the sensor with a spherical link.