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2. 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.

3. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Elevated workplace or environmental noise can cause hearing impairment, tinnitus, hypertension, ischemic heart disease, annoyance, and sleep disturbance. [3] [4] Changes in the immune system and birth defects have been also attributed to noise exposure. [5] Although age-related health effects ( presbycusis) occur naturally with age, [6] in many ...

4. 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 ...

5. How Active Noise Canceling (ANC) Headphones Work - AOL

   www.aol.com/active-noise-canceling-anc...

   Let's get started. Battle of Soundwaves. When -1+1 = 0. A good pair of ANC headphones generates an opposite "anti" soundwave to cancel out background noise. The scientific term for this effect is ...

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

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

   Sennheiser ACCENTUM Wireless Bluetooth Headphones – 50-Hour Battery Life, Audio, Hybrid Noise Cancelling (ANC), All-Day Comfort and Clear Voice Pick-up for Calls, Black. Price: $179.95. Buy On ...

7. What We Do in the Shadows (TV series) - Wikipedia

   en.wikipedia.org/wiki/What_We_Do_in_the_Shadows...

   After purchasing two pairs of noise-cancelling headphones at Best Buy with Guillermo's help, Laszlo returns to the island to find that Colin Robinson has apparently fallen in love with Sheila, but he rescues him anyway and escapes from the island; unfortunately, they leave some of the documentary crew behind. Back in the city, Nandor and Nadja ...