Comparison of a complex and simplified setup for the evaluation of digital wind noise reduction in hearing aids (vor Ort)
* Presenting author
If wind reaches the membrane of a microphone, low-frequency noise signals with high levels are generated at the electrical output. Due to space limitations, the use of passive wind shields, e.g., made of foam or furry materials, is difficult. Therefore, many hearing aids provide a digital wind noise reduction. To test this type of signal processing, technical measurements have been performed in a wind tunnel and with a conventional fan in an audiological test room. In both setups, hearing aids of six different manufacturers were tested while attached to an artificial head (KEMAR). Different configurations were considered where the wind noise reduction and/or the single channel noise reduction were turned on or off whiles speech and wind noise, and wind noise only were presented. Furthermore, not only the sound pressure levels in 1/3-octave bands but also the SNR was analyzed. Wind noise suppression could be triggered in all hearing aids, and a qualitative comparison of the outcome of both setups shows good agreement. Therefore, the results suggest that a simplified setup with a fan is sufficient for a qualitative analysis of digital wind noise reduction in hearing aids.