Abstract: Active noise reduction headphones for audiometry where the earphone portion of said headphones has a cavity volume greater than 6 cc and including an acoustic-electric sensing means and an electro-acoustic transducing means which are used cooperatively and which has additional passive noise control means in the form of a circumaural seal around the ear for improving high frequency noise control performance, the headphone having a summing junction for combining the active noise reduction signal and an audiometry test signal.
Type:
Grant
Filed:
July 29, 1998
Date of Patent:
March 11, 2003
Inventors:
Michael Allen Vaudrey, William Richard Saunders