ReSound Releases Dual-Microphone Wind Noise Reduction TechnologyBy Hearing Review - The Insider,
Publication Date: July 28, 2011
Article features wind noise reduction technology for directional hearing aids. The dual microphone signal processing technology, called WindGuard, is designed to reduce wind noise which, as it is a low frequency sound, is typically a greater problem for directional hearing aids. According to the manufacturer, ReSound, the technology works by applying enough gain reduction in the frequency bands where wind is detected to provide listening comfort without disrupting the gain levels of the frequency bands that are unaffected by wind. WindGuard consists of two components: a wind detection module and a wind reduction module. In the detection component, only sounds below 3000 herz are considered, as wind noise typically has a spectral peak around 100 herz at high wind speeds. The amount of wind noise with respect to other sounds is calculated across both microphones by correlating the filtered outputs of each microphone. The wind reduction module’s primary function is to apply gain reduction to specific frequency bands when wind noise is greater than the sound level pressure of 70 decibels. According to ReSound, WindGuard will be available in September 2011 with the release of the company’s upgraded Aventa fitting software.
Published by: Ascend Media LLC (Website:http://www.ascendmedia.com)
Link to text: http://www.hearingreview.com/insider/2011-07-28_04.asp