How does Active Noise Cancelling Headphones Work?
1 minute read
Microphone-A microphone placed inside the ear cup listens to external sound that cannot be blocked passively.
Noise-canceling circuit-electronics, also placed in the ear cup,sense the input from the microphone and generate a 'fingerprint' of the noise,noting the frequency and ampltuamp of the incoming wave. Then they create a new wave that is 180 degrees out of phase with the waves associated with the noise. Speaker-the anti- sound created by the noise canceling circuitry is fed into the headphones' speakers along with the normal audio; the anti-sound earses the noise by de-structive interference,but does not affect the desired sound waves in the normal audio.
Battery- the term active refers to the fact that energy must be added to the system to produce the noise-canceling effect. The source of that energy is a rechargerable battery
Noise-canceling circuit-electronics, also placed in the ear cup,sense the input from the microphone and generate a 'fingerprint' of the noise,noting the frequency and ampltuamp of the incoming wave. Then they create a new wave that is 180 degrees out of phase with the waves associated with the noise. Speaker-the anti- sound created by the noise canceling circuitry is fed into the headphones' speakers along with the normal audio; the anti-sound earses the noise by de-structive interference,but does not affect the desired sound waves in the normal audio.
Battery- the term active refers to the fact that energy must be added to the system to produce the noise-canceling effect. The source of that energy is a rechargerable battery
