We all have smartphones. Smartphones have become an indispensable part of our life. From Facebook to searching something in Google to watching videos in YouTube, we just can’t stay away from smartphones.
From a survey it is estimated that an average person spends 177 minutes on their smartphone.
Now some smartphones might not have this, but many have this small tiny hole. For iPhones it is in the back of the mobile whereas for others it might be in the front.
This tiny hole is known as “Noise Cancelling Microphone“. Technically, it is used to eliminate background noises so that the caller on the other end hears the respective caller’s voice clearly.
How does “Noise Cancelling Microphone” work?
The iPhone’s noise-canceling circuit works by subtracting the signal from the secondary microphone from that of the primary. The primary microphone receives both ambient noise and your voice; the secondary mic picks up just the noise. After processing, the resulting signal consists primarily of your voice and has little room noise. When you make a phone call, the person at the other end of the conversation hears your voice clearly, as the iPhone removes distracting background noises.
iPhone Audio system explained by Phil Schiller: