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Virtual Dictionary

Pinna Notch

The human ear's pinna is the funnel shaped lobe of flesh that sticks out on either side of the head. It serves to filter and focus directional sound. The pinna notch occurs because the pinna works differently for high frequency sounds than low frequency sounds. Those above a certain threshold are reflected off of the pinna's contours, bouncing back out before they enter the ear.

This creates a very slight delay between the high and low frequency components of the same sound, which effectively acts as a wave filter and cancels out noise, resulting in a sharper sound, and a lessened ability to determine direction.

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Related Dictionary Entries for Pinna Notch:

Acoustic Shock

Pinna

Pinna Notch



 

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(30/06/2009)
Neural stem cells represent the cellular backup of our brain. These cells are capable of self-renewal to form new stem cells or differentiate into neurons, astrocytes or oligodendrocytes. Astrocytes have supportive functions in the environm...


(22/09/2008)
Prosthetic ears appear to improve hearing and speech recognition in noisy environments, according to a report in the September/October issue of Archives of Facial Plastic Surgery, one of the JAMA/Archives journals.

Some patie...


(23/06/2010)
Thanks to researchers at the Centre for Digital Music (C4DM) at Queen Mary, University of London, anyone watching the World Cup on their computer can now filter out the droning sounds of vuvuzela playing in South Africa's stadiums.
...


(11/09/2009)
Researchers at NRL's Navy Center for Applied Research in Artificial Intelligence, within the laboratory's Information Technology Division (ITD), received two top awards at the 21st International Joint Conference on Artificial Intelligence...


(07/03/2010)
Sonitus Medical out of San Mateo, California is a company that's betting on bone conducting dental hearing implant technology. The SoundBite Hearing System that the firm is developing consists of a unit that has a microphone and wireless t...