Noise Cancellation
What is Noise?
Noise consists of unwanted waveforms that can interfere with communication.
Sound noise: interferes with your normal hearing
- Loud noises
- Subtle noise
- White noise (AWGN)
What is Noise Cancellation?
Noise cancellation is a method to reduce or completely cancel out unwanted sound call as Active Noise Cancellation
Noise cancellation tries to ‘block’ the sound at the source instead of trying to prevent the sounds from entering our ear canals
Active Noise Vs Passive Noise
We remove and absorb the unwanted sound and noises using two methods (active and passive cancellation).
However, the advantages of active noise control methods compared to passive ones are that they are generally:
- More effective at low frequencies.
- Less bulky.
- Able to block noise selectively
Cancellation processes depend on simple principle
- adding two signals with the same.
- amplitude and opposite phase the result will be zero signals.
Applications
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| Hospitals | Cars Cabin |
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| Besides Street, Road, Highways | Airplane Cabin |
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| Libraries | Ship and Yacht |
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| Office | Machinery & Rotary (motors, Generator, pump etc.) |
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| Home | HVAC (Air Conditioner etc.) |
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| Snore | Transformer |
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| Baby cradle and screaming | Headsets (headphone) |
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| Family Noise | Satellite Antennas Noise |
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| Sleeping | Barking Dog |