Obaiz Hassan

Academic

Career

Verbatim text

Noise Cancellation Headphones for Aircraft 
The two main problems of this project are white noise and cockpit noise that not only distort the 
radio signal but also makes it difficult for the pilot to receive the correct message sent from control 
tower or from ally. These noise signals are unwanted signals and must be removed to receive 
correct message. 
The active noise reducing headphone is probably the most successful application of active control 
of sound – the technology of canceling sound with sound. Active noise control (ANC) is a method 
for reducing the unwanted disturbances by the introduction of controllable secondary sources, 
whose outputs are arranged to interfere destructively with the disturbance from the original 
primary source. To obtain good cancellation, it is generally important that the secondary source is 
adjusted to compensate for changes in the primary noise source. 
Noise cancellation in headphones relies on the acoustic isolation characteristic of headphones with 
active noise reduction. By their nature, headphones block out some degree of external noise 
because the ear-cups absorb it, but active noise control goes a step further and diminish the noise 
that manages to get through. Active headphones are used mainly in highly noisy environments to 
protect the user from the excessive noise. 
 
 
 
 
Technology Used: 
                    DSP kit, Code Composer Studio, C, MATLAB. 
Supervisor Name: 
Dr. Farhan Khalid 
Group Members: 
Obaiz Hassan (i14 - 0476)

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