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Efficacy of a reverse cardioid directional microphone
1Widex USA, Lisle, IL 60532, USA. fkuk@aol.com
Journal of the American Academy of Audiology
|January 31, 2012
Summary
A new reverse cardioid directional microphone improves hearing in noise, especially for sounds from behind. This directional microphone technology offers benefits for specific listening situations.
Area of Science:
- Audiology
- Acoustics
- Hearing Aid Technology
Background:
- Directional microphones enhance speech understanding in noise by improving signal-to-noise ratio.
- Their effectiveness can be limited for sounds originating from behind the listener.
Purpose of the Study:
- To evaluate a directional microphone mode featuring an automatic reverse cardioid polar pattern.
- To assess its performance compared to other microphone modes.
Main Methods:
- A single-blinded, factorial repeated-measures study involved 20 adults with sensorineural hearing loss.
- Microphone modes (reverse cardioid, omnidirectional, front hypercardioid) and stimulus azimuths (front, back) were tested.
- Outcomes included aided thresholds, speech identification in quiet, and sentence recognition in noise.
Main Results:
- The reverse cardioid microphone performed similarly to the omnidirectional microphone in quiet conditions.
- Significantly better performance (p < 0.001) was observed with the reverse cardioid microphone in noise when speech originated from the back, outperforming omnidirectional and front hypercardioid modes.
Conclusions:
- The reverse cardioid directional microphone shows potential benefits for hearing aid users in specific noisy environments.
- This technology may enhance communication when speech is presented from behind the listener.
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