Noise reduction in Xiaomi phone: the complete guide to setting up

Modern Xiaomi and Redmi smartphones have become multimedia centers where sound quality plays no less a role than processor performance. Many users face a situation when during a conversation the interlocutor complains about extraneous noise, wind or echo, although the device is in perfect technical condition, this is due to improper operation or lack of setting of the active noise suppression system, which is built into the hardware of most models of the brand.

Noise reduction technology in the MIUI ecosystem and the new HyperOS is implemented on several levels: from physical isolation of microphones with software algorithms for processing audio stream in real time. Understanding how this system works on your device will significantly improve the quality of voice communication and enjoy music without annoying interference. In this article, we will discuss in detail the mechanisms of operation, how to activate hidden functions and methods for diagnosing sound problems.

Owners of budget and flagship models often do not even realize that their phone is capable of more than standard speakerphone. The correct configuration of the parameters of the audio system can make (conversation) crystal clear even in a noisy subway or on a busy street. We will look not only at standard settings, but also delve into the technical aspects available to advanced users.

The principle of active and passive noise reduction systems

To start, we need to clearly distinguish between two concepts that are often confused: passive and active noise cancellation. Passive insulation is achieved exclusively by physical methods - body design, headphone density or microphone location. In Xiaomi smartphones, engineers use special channels and mesh that mechanically cut off some of the high-frequency noise of the wind before the sound hits the microphone membrane.

Active Noise Cancellation (ANC) is a more complex hardware and software suite, and it uses extra microphones to pick up the background hum. The processor processes this signal and generates a counterphase, a sound wave that quenches the original noise, and in phones, this is especially important for HD Voice and video calls, where the purity of the voice is critical.

The AI algorithms in the new firmware have learned to recognize the type of noise, whether it's a keyboard tap, a dog barking, or a wind noise, and from that analysis, the system dynamically changes the filtering parameters, but it's worth noting that aggressive noise cancellation can sometimes cut the frequencies of a human voice, making it robotic, so balance is crucial.

⚠️ Warning: Excessive activation of noise reduction algorithms in cheap models can cause your voice to sound deaf or intermittent.

It is important to note that the efficiency of the system depends on the number of microphones. flagship models of the Xiaomi 13 or 14 series are equipped with three or more microphones, which allows you to create a complex sound picture and accurately determine the source of noise. In the budget series Redmi usually uses two microphones (main and noise suppression), which also gives a good result, but with some limitations.

Customize noise reduction during calls and in applications

The standard Android and Xiaomi shell settings often hide direct noise control sliders, relying on automatic mode. However, you can find useful options in the special features menu or in the settings of specific applications. For example, in the phone settings, a section is often available that regulates the sensitivity of the microphone or the mode of operation when talking.

To control the sound parameters in video communication applications such as Zoom, Skype or Telegram, you need to go to their internal settings, and you can often choose the noise suppression level from Automatic to High. MIUI/Dialer There are also hidden settings available through codes or developer menus that affect voice processing in the app. GSM/VoLTE network.

If you use a Mi True Wireless headset, the ANC is transferred completely to the Mi Buds app or the sound control widget in the notification curtain, where you can switch between Noise Cancel, Transparency and Off modes. For the phone's built-in microphones, these settings are less obvious, but they exist deep inside the system.

Special attention should be paid to the "Speaking Out" mode, in which the phone uses the bottom microphone and echo-suppression algorithms to prevent your voice from returning to you through the speaker. If you notice that the person is hearing yourself or a strong background, try changing the position of the phone or switching to a normal conversation mode, where the upper microphone with a different directional pattern is used.

Using an engineering menu to calibrate the microphone

For advanced users who want to have full control of the audio system, there's an engineering menu, a hidden part of the system that's designed to test equipment in the factory, and you can not only test the performance of the microphones, but you can also change some of the sensory parameters and noise reduction levels that are not available in a normal interface.

To get into the engineering menu, open the Phone app and type ##6484##. Once you enter the last digit, the CIT menu will open. Find the Main Mic Test or the Secondary Mic Test. Here you can record your voice and listen to it to evaluate the performance of a particular microphone without software processing.

CIT Menu: Single Item Test → Main Mic Test → Start

Some firmware versions (especially Chinese or global stable versions) have a deeper level of engineering menu available via code ##3646633##. Once there, go to the Hardware Testing → Audio → Audio Debugging tab. Here you can find the Noise Reduction and Digital Gain settings. Be careful: changing these values without understanding can lead to distortion of the sound or complete loss of it.

If you notice that one of the microphones is quieter or cracking on the engineering menu, it may indicate a physical malfunction or contamination of the grid. Software settings will not help, you will need to clean or replace the component, and you can also reset the audio codec settings to the factory if the sound has become incorrect after the update.

Comparison of noise reduction technologies in different Xiaomi series

Different smartphone lines use different algorithms and hardware solutions to process sound. Flagship devices are given priority in the development of audio functions, while in the budget segment, simpler, time-tested solutions are used. Understanding these differences will help you to properly adjust the expectations of the device.

Below is a table showing the differences in noise reduction approaches depending on the device series:

In the POCO series, the emphasis is often shifted towards game scenarios.The Game Turbo mode has its own microphone settings that may conflict with the system settings of calls. If you use the phone for streaming or recording voice, it is recommended to turn off game audio enhancements, as they can add unwanted effects.

Flagship models with Hi-Res Audio certification and support for high-resolution codecs (LDAC, aptX Adaptive) also have higher quality DACs (digital-analog converters), which indirectly affects the recording quality, since the signal processing circuit here is cleaner and less susceptible to electrical inputs.

Problem Solving: When Noise Reduction Is Not Working Right

Sometimes users are faced with the opposite situation: noise cancellation is too aggressive or, conversely, does not turn on. A common problem is a floating microphone, when the voice appears, then disappears. This can be caused by a software failure in the audio drivers or physical contamination of the holes.

The first thing you need to do is check if the microphones are covered with a cover or a protective film, and even a slight shift in the silicone cover can block the input of the noise-cancelling microphone, which causes the system to malfunction, amplifying noise instead of suppressing it, and it is also worth checking the speaker grids for dust and pile.

⚠️ Warning: Never use sharp objects (needles, toothpicks) to clean microphones.You may damage the membrane or push dirt deeper.Use a soft brush or special Velcro.

If the problem is software, try resetting the settings of the apps that control sound. Go to Settings → Apps → All apps → Settings and select Clear Data. This won’t delete your personal files, but will return system settings, including audio profiles, to the original state.

In rare cases, using third-party audio recording applications with manual control (amplification), such as Dolby On or RecForge II, helps. They can bypass standard system constraints and allow you to adjust the input level more flexibly, although this is not applicable for ordinary calls.

The impact of accessories and third-party applications on sound

Using non-original accessories, such as cheap Bluetooth headsets or 3.5mm adapters, can significantly reduce noise reduction efficiency. Cheap electronics bring their own noises and delays that Xiaomi algorithms can't always cope with. Original Xiaomi and Baseus accessories (certified) usually interact better with the system.

Third-party call apps (Viber, WhatsApp, Telegram) use their own compression codecs, and the quality of noise cancellation depends not only on the phone, but also on the app's servers and Internet speed, and if communication is intermittent, the system can turn off complex audio processing algorithms to save traffic and reduce delays, which leads to noise.

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Use wired headphones with built-in microphones for important conversations in noisy places. They often provide better insulation and voice quality than mid-segment Bluetooth headsets, as they don't depend on wireless audio compression.

Equalizer apps are also worth mentioning. If you have a third-party equalizer installed, it can intercept audio control and conflict with the built-in Mi Sound Enhancer module. For best results, it is recommended to use only the regular audio customization tools built into MIUI/HyperOS.

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Noise reduction quality is the combination of hardware microphones, body build quality and software algorithms, and no component works in isolation.

Frequently Asked Questions (FAQ)