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Applicant:
Indian Institute of Technology (IIT) Gandhinagar 
Title:
AN APPARATUS FOR CANCELLING ACOUSTIC FEEDBACK AND A METHOD THEREOF 
Inventor(s):
Prof Nithin V George, Mr Pradhan Somanath, Mr. Vinal Patel  
Applicant:
Indian Institute of Technology (IIT) Gandhinagar 
Application type:
Applied - 2016-03-28 
Application Number:
201621010611 
Applied at:
India 
Entered by:
Indian Institute of Technology (IIT) Gandhinagar 
Abstract:
The present disclosure relates to a field of digital signal processing. The apparatus of the present disclosure facilitates optimal feedback cancellation. The apparatus includes a first transducer, an analog to digital converter, a second transducer, a feedback cancellation unit, and a first subtractor. The first transducer receives an audio input signal from the external environment and an acoustic feedback signal from the second transducer. The first transducer is configured to convert the audio input signal and the acoustic feedback signal into a resultant analog signal. The resultant analog signal is converted into a resultant digital signal using the analog to digital converter. The feedback cancellation unit is configured to adaptively model the acoustic feedback to generate an estimated feedback signal. The first subtractor is configured to receive the resultant digital signal and the estimated feedback signal to provide a noise attenuated signal. The noise attenuated or feedback free signal is further amplified and fed to the user’s ear, which is mixed with a low level probe noise. 

 
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