Indeed, the noise floor of the fly-inspired microphone is about 17 decibels lower than what can be achieved using a pair of low-noise hearing aid microphones to create a directional hearing aid
Noise-source correlation is another factor that must be considered in directional hearing aid research.
The exception to this pattern was for the service and cost subscale, for which the directional hearing aid condition was rated significantly higher than the omnidirectional condition, which in turn was rated higher than the old aid condition.
Impact of noise source configuration on directional hearing aid benefit and performance.
Directional hearing aid benefit in listeners with severe hearing loss.
Directional hearing aids incorporate multiple microphones (or microphone ports) to improve SNR based on the spatial location of the signal of interest (front hemisphere) relative to unwanted signals (usually the rear hemisphere).
Amplification of background noise is one of the most significant consumer-based complaints associated with hearing aids, and directional hearing aids
can improve the SNR of speech occurring in a noisy background (e.g., [13, 14]).
Two different programmable first-order directional hearing aids and a large right pinna for KEMAR were circulated among the laboratories.
Ricketts, Directional Hearing Aids: Then and Now, Journal of Rehabilitation Research & Development 42 (4), 133-144 (2005).
Directional hearing aids are designed to provide less amplification for sounds that are generally behind the listener in comparison to sounds arriving from in front of the listener.
Much of my recent research has been focused on examining the benefits and limitations of the directional hearing aids that I mentioned earlier in real world listening situations.
Simulation of fixed microphone arrays for directional hearing aids
. Journal of the Acoustical Society of America, 100, 848-856.