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2. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Active noise control ( ANC ), also known as noise cancellation ( NC ), or active noise reduction ( ANR ), is a method for reducing unwanted sound by the addition of a second sound specifically designed to cancel the first. The concept was first developed in the late 1930s; later developmental work that began in the 1950s eventually resulted in ...

3. Noise-canceling microphone - Wikipedia

   en.wikipedia.org/wiki/Noise-canceling_microphone

   In a noisy environment, both microphones receive noise at a similar level, but the primary mic receives the desired sounds more strongly. Thus if one signal is subtracted from the other (in the simplest sense, by connecting the microphones out of phase) much of the noise is canceled while the desired sound is retained.

4. Dolby noise-reduction system - Wikipedia

   en.wikipedia.org/wiki/Dolby_noise-reduction_system

   A Dolby noise-reduction system, or Dolby NR, is one of a series of noise reduction systems developed by Dolby Laboratories for use in analog audio tape recording. The first was Dolby A, a professional broadband noise reduction system for recording studios in 1965, but the best-known is Dolby B (introduced in 1968), a sliding band system for the consumer market, which helped make high fidelity ...

5. Best Noise-Cancelling Headphones: Here’s Where To Get ... - AOL

   www.aol.com/lifestyle/best-noise-cancelling...

   Traveling can be stressful, especially if you are on a loud flight with a roaring engine on your left side and a crying baby on your right. However, you can enjoy a pleasant and calm trip with a ...

6. Why are flags at half-staff today in Iowa? - AOL

   www.aol.com/why-flags-half-staff-today-145822623...

   Reynolds ordered that flags remain at half-staff until sunset on the day of Northey’s funeral and internment. Funeral services will be at 3 p.m. Saturday at Valley Church, 4343 Fuller Road, in ...

7. Why are flags flying at half-staff in South Carolina?

   www.aol.com/why-flags-flying-half-staff...

   Usa.gov states that the American flag flies at half-staff when the country or a state is in mourning. The president, a state governor or the mayor of the District of Columbia can order flags to ...