The quality of voice and video recording is directly dependent on the correct operation of the audio system of your device. Many owners of Xiaomi, Redmi and POCO smartphones face a situation when the interlocutor hears you too quietly, the sound is interrupted or extraneous noises appear. Often users believe that this is a hardware defect, but in most cases, competent software adjustment or sensitivity calibration is required.
The MIUI operating shell and the new HyperOS have special engineering menus and system settings that allow you to fine-tune the microphone, and the right configuration of these settings can do wonders, returning the device to the sound quality declared by the manufacturer. Let's take a look at all available optimization methods.
Diagnostics: Why the microphone is not working well
Before you start complex manipulations, you need to understand the nature of the defect. The problems with the sound on Xiaomi smartphones are often software-related, associated with the operation of noise reduction algorithms. The system can mistaken your voice for background noise and aggressively “press” it, making it illegible.
It's also important to consider the physical condition of the device, because if the phone fell or was exposed to moisture, the membrane of the main or secondary microphone could get damaged, and in such cases, software calibration won't help, and you'll need to replace the module at the service center, but if the device is visually intact, the chances of success are high.
⚠️ Warning: Before you start any settings, be sure to check the protective film or cover. Often they overlap the bottom hole of the microphone, drastically reducing the volume of the incoming signal.
Another common reason is that third-party apps are not working properly, and messengers like WhatsApp or Telegram may have their own microphone permission settings that conflict with system ones, so the diagnosis must be comprehensive.
Using the CIT Engineering Menu to Check
The most reliable way to test the performance of all audio modules is to use the built-in CIT engineering menu, which is designed to test equipment and isolate software failures from physical breakdowns, accessed through a special code in the "bell ringer".
Dial ##6484## in the call app, and you’ll see a list of tests where you’ll find a item related to audio (usually called Receiver, Mic, or Speaker), which will allow you to turn on each microphone and evaluate the quality of the recording.
☑️ Checking in CIT
During the test, the system will ask you to say a phrase or just make a sound. Watch the signal level indicators. If the stripes move, but the sound in the speaker is not audible or it is very quiet, the problem may be in the speaker, not in the microphone. If the stripes do not respond at all, this is a sign of a serious malfunction.
⚠️ Attention: Don't leave the menu CIT, Until you test all the microphones available (usually two or three), damage to the top microphone often goes unnoticed until you try to turn on the speakerphone.
Configuring noise reduction parameters
Modern Redmi and POCO smartphones have powerful noise-repression algorithms that sometimes work too aggressively. Standard Android settings don’t have a sensitivity slider, but there are hidden parameters that affect sound processing. They often require third-party utilities or engineering codes to access.
One effective way to reset the audio settings to factory settings is through the recovery menu, which removes possible software conflicts that have arisen after the system updates, and it is also worth checking the settings of the specific application through which you communicate: some messengers have an option called Noise Suppression, which is better to disable if you have poor communication.
If you use a headset, make sure that the Bluetooth settings turn off additional audio effects that can overlap. Double noise cancellation (on the phone and in headphones) often leads to voice distortion beyond recognition.
Hidden codes for different regions
Cleaning and maintenance of the audio system
Physical cleaning is something that 80 percent of users forget: microphone holes on Xiaomi smartphones are located in places where dust and pile accumulate the fastest. Over time, compressed dirt creates a cork that prevents the sound wave from passing to the membrane.
Use a soft brush or a special Velcro to clean the equipment. It is strongly recommended not to use sharp objects such as needles or toothpicks, as they can easily damage the protective net or the membrane itself. You can also gently blow the holes, but without using compressed air at high pressure.
- 🧹 Use a soft toothbrush to remove surface dust.
- 💨 Blow the holes carefully (not with your mouth so that moisture does not get into the air).
- 🧲 Use magnetic sticky tape to extract the pile from the depths.
- 🚫 Avoid using alcohol in large quantities so as not to damage the glue.
Regular maintenance ensures that the calibration is effective, and if the hole is clogged, no software settings can amplify the sound, because the physical access of the sound wave is blocked.
Use of third-party applications for calibration
Standard Android tools are limited in fine-tuning (amplification) of the microphone. For deeper work, you can use applications from Google Play, which allow you to control the gain levels if the device driver allows. A popular solution is the Lesser AudioSwitch application or analogues.
These programs allow you to force the sound and microphone sources to switch, and also change the volume levels of recording. However, it is worth remembering that excessive amplification will lead to wheezing and distortion, an increase in the level of no more than 10-15% of the standard value is considered optimal.
There are also applications for recording audio with manual level control, and by recording the test track and analyzing it, you can understand at what level clipping occurs, or, conversely, going into noise.
Resetting and software update
If a software failure causes a malfunction, a complete reset will help. Be sure to back up your data before you do that. Often after you update your MIUI or HyperOS firmware (here you were talking about HyperOS, but div tag is forbidden, we fix it on p), the audio settings may conflict with the new drivers. Resets the system back to a clean state.
Also check for system updates. Xiaomi engineers regularly release patches that fix modem and audio chip bugs. Go to Settings → About Phone → MIUI/HyperOS version and click the update check button.
| Problem. | Probable cause | Decision |
|---|---|---|
| The interviewer doesn't hear at all. | Physical break or software lock | Checking in CIT, resetting settings |
| The sound is very quiet. | Pollution or aggressive noise cancellation | Cleaning, shutting down the noise maker |
| You hear a crackle or a squeak. | Network interference or speaker damage | Check elsewhere, replace the module |
| The sound comes and goes. | Bad plume contact | Disassembly and reconnection (service) |
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If the microphone still does not work properly after resetting and cleaning, the probability of hardware failure is 95%.