How Xiaomi headphones work and work: from Bluetooth to ANC

Xiaomi headphones have long ceased to be just an accessory - they have become a full-fledged gadget with advanced features that compete with flagships from Sony or Bose. But how exactly these compact devices convert digital signals into sound, sync with a smartphone in fractions of a second and filter out extraneous noises? If you ever wondered why Mi True Wireless Earphones connect so quickly and Redmi Buds 4 Pro so well suppress street hum, this article will reveal all the technical secrets.

We will analyze the principles of operation of different types of Xiaomi headphones - from budget wired models to premium ones. TWS with active noise cancellation, explain how the sound transmission over Bluetooth is arranged, what are aptX codecs and AAC, And you'll also learn what chips are hidden in the Mi Earphones app and how to properly operate the gadget so that it lasts longer.

Spoiler: in headphones Xiaomi with hybrid ANC It uses not two but three microphones – two external ones for ambient noise and one internal one for ear sound correction, which gives 30% better suppression of low-frequency noise compared to competitors in the same price segment.

1. Types of headphones Xiaomi: what are the differences TWS, liners and overhead models

Xiaomi’s line of headphones includes more than 20 models, but they are all divided into three main types in terms of design and wear. Each type has its pros, cons and applications – from sports training to listening to music in a noisy subway.

TWS (True Wireless is a fully wireless headphone that is not connected by cable, such as the Xiaomi Buds 4 Pro, Redmi Buds 5, and their main advantage is freedom of movement, but it comes at a cost of latency and the need to charge the case regularly. Inside each ear are hidden miniature Bluetooth chip, battery, speaker and microphone.

Wired liners (e.g. Mi In-Ear Headphones Pro 2) are connected to the device via a 3.5mm jack or USB-C. They're cheaper. TWS, They don't require charging, and they often produce better sound because they don't compress Bluetooth, but they limit mobility and wear out faster.

Overhead/full-size headphones (Xiaomi FlipBuds Pro in arch mode) cover the ear completely, providing better sound insulation. Their speakers are larger, so the basses are deeper, but wearing longer than 2-3 hours can be uncomfortable.

• 🔋 TWS: Autonomy 4-8 hours, weight 3-5 g, support for sensor control.
• 🎧 Wire: no lag, price from 500 ₽, but the risk of cable breaking.
• 👂 Overhead: the best noise insulation, but bulky for the sport.

⚠️ Note: If you choose headphones for gaming consoles (PS5, Xbox, pay attention to Bluetooth 5.2 support+ Many Xiaomi models are optimized for smartphones and can give a sound delay of up to 200 ms on consoles.

2. How Bluetooth works in Xiaomi headphones: protocols, codecs and latency

The wireless audio transmission in Xiaomi headphones is based on Bluetooth technology, but not all versions of the protocol are equally good. Current models (such as the Buds 4 Pro) use Bluetooth 5.3, which is compared to Bluetooth 4.2 (as in the old Redmi AirDots):

• 📶 Consumes 40% less energy (lasts longer on the battery).
• 🎯 Supports dual connection (you can listen to music from your phone and simultaneously take calls on your laptop).
• ⚡ Reduces latency to 80-120 ms (versus 200 ms)+ MS in older versions).

However, Bluetooth itself is only a “transport”, and the sound quality depends on the codec that compresses and unpacks the audio data.

To check which codec is used in your headphones, go to Bluetooth Settings. → [Your headphones] → Plus (on Android). iPhone codec will always be AAC, Apple does not support aptX or LDAC.

⚠️ Attention: If the sound quality suddenly deteriorates in Xiaomi headphones (wheezing, cliffs appear), try manually switching the codec in the Bluetooth settings. SBC AptX, even if both are supported.

3. Active noise cancellation (ANC): How to use Xiaomi Buds 4 Pro and other models

Technology ANC (Active Noise Cancelling in Xiaomi headphones is built on the principle of destructive interference: external microphones pick up the surrounding noise, and internal electronics generate an “antis noise” – a sound wave mirrored opposite the original one.

Xiaomi Buds 4 Pro and FlipBuds Pro models use hybrid ANC, blend:

1. Feedforward-microphones (outside the headphone) – catch high-frequency noises (voices, keyboard).
2. Feedback microphone (inside) – analyzes how sound enters the ear and corrects anti-noise.

The effectiveness of ANC depends on:

• 🔊 Noise frequencies: Low frequencies (aircraft engines, air conditioners) are best suppressed; loud talk or crying in children ANC «pass over».
• 🔋 Charge level: at discharge below 20% ANC It automatically shuts down to save energy.
• 👂 Densities of fitting: if the embushures (inlays) are of incorrect size, ANC Loss of 50% efficiency.

In the Mi Earphones app (available for Android), you can adjust the level ANC (weak/medium/strong) or enable Transparency mode, which, on the contrary, lets out external sounds for outdoor safety.

4. How Xiaomi headphones reproduce sound: speakers, frequency range and equalizer tuning

The sound quality of the headphones is controlled by a speaker, a miniature loudspeaker that converts electrical signals into sound waves. Xiaomi models use:

• 🔊 Dynamic drivers (most models) are versatile, with a balance of bass and high frequencies. Membrane size is usually 10-12 mm.
• 🎚️ Balanced fittings (less commonly in Mi Hybrid Pro) – better at conveying details, but weaker on bass.
• 🔥 Hybrid systems (dynamics) + fittings) – in premium models for extended frequency range.

The frequency range of most Xiaomi headphones is 20Hz – 20kHz, but that’s a marketing figure.

• 📉 Lower frequencies (bass): in budget models (Redmi Buds 3) begin to “sink” below 60 Hz.
• 📈 Upper frequencies (soprano, high hat): after 16 kHz, the sound becomes muted even in flagships.

The equalizer helps to correct the sound. The Mi Earphones app has 10 preset profiles (e.g. Bass, Voice, Jazz) or manually adjusting the 60Hz, 230Hz, 910Hz bands, etc. Tip: for podcasts, reduce 1-3kHz to remove the hissing of voices.

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If Xiaomi headphones suddenly lost bass, check the density of fittings of the earpieces. Even the micro gap disrupts the acoustic camera, and low frequencies "leak".

5. Touch control and voice assistants: how it works

Xiaomi wireless headphones are controlled via touch panels or physical buttons, such as Buds 4 Pro, which supports gestures:

• 👆 One touch: playback/pause.
• 👆👆 Double touch: the next track (right ear) or the previous one (left ear).
• 👆👆👆 Triple touch: Calling the voice assistant (Google Assistant or Xiao) AI).
• 👆Retention: regime switching ANC/Transparency.

Use the Mi Earphones app (Touch Controls section) to adjust your gestures. Importantly, sensor sensitivity can be adjusted (low/medium/high) to avoid false positives.

Voice assistants (Xiao) AI, Google Assistant, Siri, are activated through headphone microphones. Xiaomi Buds uses a noise cancellation system when talking (ENC), It filters out background sounds when you're making calls, and if you're talking in the wind, for example, the algorithms suppress the wind noise, but they keep the voice.

⚠️ Warning: If the voice assistant is not responding to a command, check in Bluetooth settings if the microphone and notification permission for the Mi Earphones app is enabled.

6. Battery and charging: why Xiaomi headphones discharge quickly

The autonomy of Xiaomi headphones depends on three factors: battery capacity, Bluetooth version and active functions (ANC, ENC). For example:

• 🔋 Redmi Buds 4: a 43 mAh battery in each headphone + 470 mAh in the case → up to 6 hours of music (30 hours with case).
• 🔋 Xiaomi Buds 4 Pro: 58 mAh + 600 mAh → up to 9 hours (36 hours with case).

In practice, the working time is reduced if:

• 🎧 On. ANC (expense +20–30%).
• 📞 Frequent calls (microphones and ENC eat up).
• 🔊 High volume (at maximum autonomy drops by 40%).
• 🌡️ Cold (lower than 0)°Capacity of Lithium Polymer Batteries Decreased by 15-20%).

Charging headphones occurs through a wireless case (connected by USB-C Or Qi in premium models:

• ⚡ Use the original cable – cheap analogues may not provide the desired current (5V/1A).
• 🔄 Do not keep your headphones on charge for more than 2 hours – this reduces battery life.
• 🔋 Once every 3 months, discharge the headphones to zero and charge up to 100% to calibrate the power controller.

7. Device pairing: why Xiaomi headphones don't connect

The process of connecting Xiaomi headphones to a smartphone or PC usually takes place in 3 stages:

1. Activation of the pairing mode: remove the headphones from the case or hold the button on the case for 3 seconds (until the indicator blinks).
2. Device Search: On your phone, turn on Bluetooth and select Mi True Wireless... in the list.
3. Confirmation: Some models require you to click “Connect” in the pop-up window.

If the headphones are not connected, check:

• 📱 Bluetooth version on your phone (Buds 4 Pro requires Bluetooth 5.0)+).
• 🔄 Resetting: Press the button on the case for 10 seconds until the indicator flashes red.
• 🛠️ Update to the firmware via Mi Earphones (Firmware Update section).

On a Windows PC, headphones can be defined as Headset instead of Headphones.

1. Open the control panel. → Sound.
2. Choose your headphones, press Properties → Additionally.
3. Disable additional sound processing.

⚠️ Note: Xiaomi headphones can automatically disconnect from the device if no sound is played within 10 minutes.This is a power saving feature - to return the connection, just tap the sensor.

8. Frequent malfunctions and how to fix them

Even the most reliable headphones Xiaomi can eventually break. TOP-5 problems and solutions:

If the headphones don’t turn on at all, try:

1. Put them in the case for 30 seconds, then retrieve them.
2. Connect the case to charge for 10 minutes (even if the indicator does not burn).
3. Reset the settings (for most models: hold the button on the case for 15 seconds).

For a deep diagnosis, use the Mi Earphones app (Device Status section) which shows:

• 🔋 The level of charge of each headphone and case.
• 🎛️ Firmware version and available updates.
• 🔊 State of microphones and speakers (sound test).

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If Xiaomi headphones are no longer defined by devices, 80% of cases helps reset via holding the button on the case. This resets all settings, including pairing with gadgets.

FAQ: Answers to popular questions