Modern Xiaomi and Redmi smartphones are equipped with advanced audio processing algorithms that often remain hidden from the user by default. Many device owners face a situation where the interlocutor complains about background noise, wind or echo during a conversation, even if the environment is relatively quiet. The problem lies not always in poor communication, but in the incorrect operation of software filters or their complete absence in standard call settings.
Turning on noise cancellation can dramatically change the quality of communication, especially if you are often in noisy places or talking on the go. MIUI and the new HyperOS offer multiple levels of microphone control, from basic network settings to deep calibration through an engineering menu, and understanding these mechanisms will allow you to get rid of annoying interference and make your voice clearer.
In this article, we will take a look at all the ways you can activate suppression noise on different models of the Chinese brand: you will learn how to use hidden features, whether to trust third-party applications and why sometimes software noise reduction can work against you.
Basic sound settings when calling
The first thing you need to check for Xiaomi users is the standard telephony settings, which are often ignored. In most cases, the system automatically detects the noise level, but manual control gives a more predictable result. To access them, open the Phone app and go to the settings by clicking on three dots or a gear in the corner of the screen.
So here you're looking at Call Settings or Settings, and this is where the switch that suppresses echoes and background hums is hidden, and activating this feature makes the processor more aggressively filter non-human voice frequencies, but it's worth remembering that overfiltering can make your voice robotic.
If you haven’t found an obvious “Noise Canceling” slider, pay attention to the item. HD-Voice, or VoLTE. These technologies transmit sound in higher quality and often have built-in, more efficient signal-cleaning algorithms compared to conventional voice communication. 2G/3G. Enabling VoLTE from the operator is the first step to clean sound without third-party software.
Use of the Engineering Menu for Calibration
For advanced users who lack standard options, there is access to the MIUI engineering menu, a hidden part of the system designed for testing equipment, where you can manually adjust the sensitivity of the microphone and noise reduction parameters, and enter this mode through a set of special code in the call application.
Enter ##6484## or ##3646633## (code may vary depending on the processor: MediaTek or Snapdragon). Once you enter the menu, select the Hardware Testing tab, then go to Audio. Here you will need the AudioDebug or Speech Enhancement subsection, where you can select the microphone profile (for example, Normal Mode or Handset Mode).
Inside the profiles, you'll see settings like Expander, Noise Suppression and Acoustic Echo Canceller, which allow you to fine-tune how aggressively the phone will cut off low frequencies (hum) and high frequencies (hises). Be careful: the wrong settings can cause the microphone to stop working altogether.
☑️ Check before entering the engineering menu
⚠️ Warning: Changing the settings in the engineering menu without understanding their purpose can cause the sound system to malfunction.
Customization of the microphone in communication applications
Often the problem is not with the system, but with specific applications such as Telegram, WhatsApp or Viber, which have their own audio processing algorithms that may conflict with Xiaomi’s system settings. Most messengers have their audio settings in the Data and Storage or Privacy section.
For example, you can find a system noise cancellation option on Telegram, where if it's turned off, the app relies on its algorithms, which sometimes work worse. On WhatsApp, the situation is similar: make sure the app has all the necessary permissions to use the microphone in high quality. Sometimes it helps to clean the app's cache if the sound is deaf.
It's also worth checking the Bluetooth headset settings if you use them for calls. The Bluetooth device menu often has a separate switch for "Absolute Volume Level" or "Duplex Communication," which affects how the noise maker works. Disabling or turning on these features can instantly solve the echo problem.
Why is WhatsApp sounding quieter than a regular call?
Third-party applications for improving sound
If built-in tools are not enough, Google Play offers a variety of tools to amplify and clean sound, with the leading applications in this niche being Precise Volume, Volume Control or specialized Audio Enhancer, which allow you to create customized equalizer profiles and include additional noise reduction filters.
However, installing third-party software has its own risks: applications that require deep system resolutions and can conflict with MIUI drivers, causing periodic audio failures or battery drains. Be sure to read reviews before installing, paying attention to compatibility with your version of Android.
Sound clearing applications are a special feature, and they often have more powerful built-in filters than a standard call, and if your goal is to record a clean conversation, rather than just a comfortable real-time conversation, using a dedicated recorder will be the most effective way to archive important information.
| Annex | Type of filtration | Impact on the battery | Difficulty setting up |
|---|---|---|---|
| Precise Volume | Equalizer + Limiter | Low. | Medium |
| Volume Control | Signal amplification | Average. | Tall. |
| Equalizer FX | Frequency correction | Low. | Low. |
| Bass Booster | Low frequency amplification | Average. | Low. |
The influence of covers and accessories on the microphone
Not to forget the physical factor. Xiaomi phones often use a system of two or three microphones: one main (usually at the bottom) and additional (top or back) for noise cancellation. If you use a tight protective case, it can cover the holes for auxiliary microphones.
When the second microphone is closed, the phone cannot correctly compare background noise to the user's voice, and the noise reduction algorithm stops working or starts to work incorrectly, cutting off your voice along with the noise. Take off the case and see if the sound quality changes. If so, then the problem is solved by buying a case with the right cutouts.
Also check the microphone holes for contamination.Dust, pocket pile and skin fat can clog the net in a few months of use.Get cleaned with a soft brush or use of a special electronics cleaning gel will return the microphone sensitivity.
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Physical locking of microphone holes with a cover is the most common cause of sudden deterioration in sound quality after buying a new accessory.
Solving problems with Bluetooth headsets
When using wireless headphones or car systems, noise cancellation is often governed by the settings of the playback device itself, not the phone. However, MIUI has hidden codec settings that affect the transmission of sound. Go to Settings → Bluetooth, click on the gear next to the connected device.
You can try changing your codec profile here (e.g. SBC or AAC). Some codecs are better at voice, others are better at music. If you can't hear you through the headset, try switching your profile. Some Xiaomi models have a separate "Mono-audio" or "Balance" setting in the "Special Features" menu, which can affect the microphone.
If the problem persists with only one particular headset, it may be because of its firmware. Update the headphone firmware through the manufacturer's proprietary app (e.g. Xiaomi Earbuds or Galaxy Wearable). Often manufacturers release patches that fix noise-mixing bugs.
⚠️ Warning: When connecting to car media, make sure that your phone settings do not activate In-Car or Do Not Disturb Driving mode, which may limit the microphone for safety or resource saving.