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Active Noise Control System for Use in Noise Cancelling Devices
Category(s):
For Information, Contact:
Jay Bjerke
Commercialization Manager, Engineering
515-294-4740
licensing@iastate.edu
Web Published:
5/7/2015
ISURF #
3501
Summary:
Iowa State University researchers have developed a system for noise control for use in noise cancelling devices such as headphones.

Development Stage:
An active noise control system consisting of a headset, speaker, microphone and controller has been developed, and large reductions of high frequency tonal noise have been demonstrated experimentally. 

Description:
Reduction of noise in certain work and other environments is important for communication, safety, preservation of hearing, and for personal comfort.  Noise control using passive headsets generally provides substantial broadband noise reduction, but without the ability to selectively control one frequency of noise over another.  In addition, existing active noise control headsets have been limited to control of only low frequencies (less than 1 KHz) but are not able to reduce high frequency noise due to design limitations.  To overcome these drawbacks, ISU researchers have developed an active noise control system that enables selective control of one region of the audio spectrum while leaving another uncontrolled, thus allowing the user to minimize unwanted noise while retaining the ability to hear wanted or useful noise.  The system is also able to significantly reduce undesirable high frequency noise by identifying frequencies associated with the loudest noise and creating multiple narrow-band reductions in these problematic regions.  This active noise control system has utility for situations or environments—such as machine shops, airplanes or dental offices—where reduction of distracting or potentially harmful noise is desirable, but where the ability to hear other noise for communication or other purposes is required.

Advantage:
• Selective (enables the user to minimize unwanted noise while retaining desirable frequencies, such as those used for speech)
• Effective (enables mitigation of high frequency noises)
• Versatile (has utility in a wide variety of noisy environments, such dental offices, airplanes, machine shops and manufacturing facilities)
Application:
Noise control
Patent Information:
*To see the full version of the patent(s), follow the link below, then click on "Images" button.
Country Serial No. Patent No. Issued Date
United States 12/189,967 9,558,732* 1/31/2017


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