Featured Research

from universities, journals, and other organizations

Sensitive new microphone modeled on fly ear

Date:
May 30, 2013
Source:
Acoustical Society of America (ASA)
Summary:
Using the sensitive ears of a parasitic fly for inspiration, a group of researchers has created a new type of microphone that achieves better acoustical performance than what is currently available in hearing aids.

Using the sensitive ears of a parasitic fly for inspiration, a group of researchers has created a new type of microphone that achieves better acoustical performance than what is currently available in hearing aids. The scientists will present their results at the 21st International Congress on Acoustics, held June 2-7 in Montreal.

Related Articles


Ronald Miles, Distinguished Professor of Mechanical Engineering at Binghamton University, studies the hearing of Ormia ochracea, a house fly-sized insect that is native to the southeast United States and Central America. Unlike most other flies, Ormia ochracea has eardrums that sense sound pressure, as do our ears, and they can hear "quite well," says Miles. The female flies use their "remarkable" directional hearing to locate singing male crickets, on which they deposit their larvae.

Previously, Miles and colleagues Daniel Robert and Ronald Hoy described the mechanism by which the fly achieves its directional hearing, despite its small size. Now Miles and his group have designed a new microphone inspired by the fly's ears.

The new design uses a microelectromechanical microphone with a 1 mm by 3 mm diaphragm that is designed to rotate about a central pivot in response to sound pressure gradients. The motion of the diaphragm is detected using optical sensors. To minimize the adverse effects of resonances on the response, Miles and his colleagues used a feedback system to achieve so-called active Q control.

"Q control basically is an electronic feedback control system to introduce electronic damping," Miles explains. "You don't want a microphone diaphragm to ring like a bell. It turns out that in order to achieve a very low noise floor -- which is the quietest sound that can be detected without the signal being buried in the microphone's noise -- it is important to minimize any passive damping in these sensors. If you do that, the diaphragm will resonate at its natural frequency. We are the first group to show that you can use this sort of electronic damping in a microphone without adversely affecting the noise floor of the microphone."

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. The new design could be used in applications ranging from hearing aids and cell phones to surveillance and acoustic noise control systems, Miles says, and "could easily be made as small as the fly's ear."


Story Source:

The above story is based on materials provided by Acoustical Society of America (ASA). Note: Materials may be edited for content and length.


Cite This Page:

Acoustical Society of America (ASA). "Sensitive new microphone modeled on fly ear." ScienceDaily. ScienceDaily, 30 May 2013. <www.sciencedaily.com/releases/2013/05/130530152851.htm>.
Acoustical Society of America (ASA). (2013, May 30). Sensitive new microphone modeled on fly ear. ScienceDaily. Retrieved March 31, 2015 from www.sciencedaily.com/releases/2013/05/130530152851.htm
Acoustical Society of America (ASA). "Sensitive new microphone modeled on fly ear." ScienceDaily. www.sciencedaily.com/releases/2013/05/130530152851.htm (accessed March 31, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Tuesday, March 31, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Solitair Device Aims to Takes Guesswork out of Sun Safety

Solitair Device Aims to Takes Guesswork out of Sun Safety

Reuters - Innovations Video Online (Mar. 31, 2015) — The Solitair device aims to take the confusion out of how much sunlight we should expose our skin to. Small enough to be worn as a tie or hair clip, it monitors the user&apos;s sun exposure by taking into account their skin pigment, location and schedule. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Soda, Salt and Sugar: The Next Generation of Taxes

Soda, Salt and Sugar: The Next Generation of Taxes

Washington Post (Mar. 30, 2015) — Denisa Livingston, a health advocate for the Dinι Community Advocacy Alliance, and the Post&apos;s Abby Phillip discuss efforts around the country to make unhealthy food choices hurt your wallet as much as your waistline. Video provided by Washington Post
Powered by NewsLook.com
UnitedHealth Buys Catamaran

UnitedHealth Buys Catamaran

Reuters - Business Video Online (Mar. 30, 2015) — The $12.8 billion merger will combine the U.S.&apos; third and fourth largest pharmacy benefit managers. Analysts say smaller PBMs could also merge. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
S. Leone in New Anti-Ebola Lockdown

S. Leone in New Anti-Ebola Lockdown

AFP (Mar. 28, 2015) — Sierra Leone imposed a three-day nationwide lockdown Friday for the second time in six months in a bid to prevent a resurgence of the deadly Ebola virus. Duration: 01:17 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins