SPEECH ENHANCEMENT IN PRESENCE OF WIND
Using microphone out in a wind may be very tricky. The audio signal captured by the action camera, smartphone or any other device using a traditional microphone will be a mixture of the desired speech and wind noise. Wind noise is a sound produced by wind when it encounters the microphone surface.
Ordinary microphones treat all the sound components the same way, by transmitting the wind noise along with the speech signal. Kardome™ is an innovative microphone that provides a spatial focus on the desired speaker in acoustically challenging environments. Specifically, wind noise is identified and attenuated in real-time by Kardom's speech enhancing algorithms.
In the following audio example, we demonstrate the wind noise effect. A speech was recorded by an ordinary microphone and by Kardome™, outdoor in mild wind conditions.
Speech Intelligibility Index = 0.27
Speech Intelligibility Index = 0.63
The traditional beamforming methods are presented and the challenges that arise when applying a traditional beamformer to acoustical indoor applications are discussed. Finally, Kardome’s location-based speech enhancer is presented and its applicability to extracting the desired speech portion in a noisy, multi-speaker, and reverberant environment is demonstrated in a natural VUI application.
Kardome™ is an innovative microphone that provides a spatial focus on the desired speaker in acoustically challenging environments such as vehicles. Unlike other microphones, which are based mostly on directional beamformers, Kardome™ provides a location-based speech enhancer, which focuses the microphone on the location of the desired source rather than toward the direction of the source.