What is the use of the small round hole at the bottom of the phone?
Using your smartphone anytime, anywhere, you’ve probably discovered a small round hole at the bottom of the device. Do you know what it does?
Even when using a smartphone every day, many people still do not understand all its functions, as well as the meaning of each part and design features, including the small round hole at the bottom. phone.
The use of the small round hole at the bottom of the phone
In fact, this small hole is the secondary microphone in the dual microphone design that has the effect of reducing noise. It is a noise canceling microphone, found in every modern smartphone. Thanks to this small hole, you can make calls with high quality. Without it, the person on the other end of the line won’t be able to hear you clearly.
Even when there is a lot of noise around, you can still hear the other person’s voice on the call thanks to the small hole at the bottom of the phone. It makes your voice clearer, which is why it’s on the bottom part of the phone, next to your mouth, and not at the top.
Sound waves pass through it and are amplified even more by the person you are talking to. You will hardly be able to chat on the phone if the device does not provide this feature.
Most cell phones have two noise-reducing microphones, one on the top and one on the bottom of the phone. When the phone is in use, if it is affected by ambient noise, the other party will not be able to hear what we are saying. The use of the small hole at the bottom of the phone is to reduce noise very well through technical means. It can remove some noise and leave only the sound of the call.
The use of two microphones in a mobile phone is technically called “dual microphone noise reduction technology”. When we talk through the main microphone, ambient sounds will also leak in, which will make the call very noisy.
If there are secondary microphones, they can process the received sound waves, filtering or attenuating the sound waves. Even in noisy environments, call quality is still relatively good, which is a result of the application of this technology.
The small hole at the bottom of the phone can become clogged with dust, reducing call quality. If you clean it, the microphone will return to normal.
Tips for properly cleaning phone speakers
Use soft materials for cleaning: You can use items available in the house such as cotton balls, soft-bristled toothbrushes… to gently scrub the speaker port; You can dip it in rubbing alcohol to increase effectiveness, but don’t get it too wet.
Use adhesive tape: Roll the tape into a cylinder, the sticky side facing out, then insert the tape tube into the phone speaker hole. Dirt and debris will adhere to the tape gently. Please replace another tube of tape if it is too dirty.
Blow dust and debris out of the speaker: If you blow at a moderate level, debris from inside the speaker will fly out. You can blow through your mouth or use a compressed air spray specialized for cleaning computers and electronics to be more effective.
Clean the headphone jack: If the 3.5 headphone jack is dirty, it will make the headphone sound crackling and reduce quality, making it difficult for you to talk through headphones. Therefore, the headphone jack also needs to be cleaned. You can use a cotton swab to gently insert it into the jack and clean it.
