When developing the new Galaxy Buds4 Pro, Samsung focused heavily on completely reimagining how an earbud captures and transmits the human voice. Their first objective was to develop a brand-new Sensor Fusion technology — ensuring a user’s speech can cut through the noise with absolute clarity.

What Is Sensor Fusion and How Is It Important for Call Quality?

When it comes to taking calls, an earbud’s microphone is much farther from your mouth than a phone’s, making your voice highly susceptible to being drowned out by ambient noise. For traditional earbuds relying on a single sensor, this physical limitation often means compromised call quality, especially when ambient noise is louder than the user’s voice.

To overcome this, Samsung applied an environment-aware Sensor Fusion technology[1] for Galaxy Buds4 Pro. Instead of relying on one input, Samsung’s technology intelligently combines multiple sensors to recognize and adapt to the surrounding environment.

Galaxy Buds4 Pro is equipped with three microphones — two external microphones directly capture a user’s voice, while a third internal microphone detects speech transmitted within the body. Importantly, a Voice Pickup Unit (VPU) sensor based on bone conduction also detects the head’s physical vibrations when a user speaks.

A cutaway of Galaxy Buds4 Pro — three microphones and a VPU sensor work in harmony to precisely reconstruct voice data.

The voice data then activates a noise reduction algorithm that allows Galaxy Buds4 Pro to precisely isolate and comprehensively reconstruct the user’s voice from surrounding noise with pinpoint accuracy, ensuring clear communication even in the most chaotic environments.

How Sophisticated Is Galaxy Buds4 Pro’s Noise Reduction Algorithm?

An AI-based system called a Deep Neural Network (DNN) — modeled loosely on the structure of the human brain — serves as the core noise reduction technology within Galaxy Buds4 Pro’s Sensor Fusion technology. Typically, software this powerful requires massive computing power that simply cannot fit inside a tiny earbud. However, Samsung meticulously optimized its algorithm for on-device processing, slashing the processing load to roughly 10% of the original computational requirements and shrinking the model size to just 30%, successfully bringing powerful AI voice processing to a compact earbud form factor.

But blocking noise isn’t enough to guarantee true call clarity — the earbuds must also make sure your voice sounds natural. To do that, Galaxy Buds4 Pro analyzes past, present and predictive sound data to instantly adapt to rapidly changing environments. Samsung also upgraded its algorithm to capture 16 times more vocal detail than previous models. Because of this massive boost in precision, every part of your speech — from high-pitched tones to sharp consonants and subtle word endings — remains crisp and easy to understand, no matter how loud your environment gets.

Galaxy Buds4 Pro even accounts for natural body movements that can cause the earbuds to shift, causing ‘fit leakages’ that allow unwanted background noise to seep in. To counter this, Galaxy Buds4 Pro continuously analyzes signals from the inner and outer microphones to estimate leakage in real time, dynamically adjusting the audio to keep the call crystal clear.

Furthermore, Galaxy Buds4 Pro’s superior DNN-powered voice clarity is truly maximized when paired with a Galaxy smartphone, harnessing a Super Wideband (SWB) connection of up to 16 kHz to deliver exceptionally rich and natural voice quality.

▲ Voice clarity WITHOUT Galaxy Buds4 Pro’s noise reduction algorithm

▲ Voice clarity WITH Galaxy Buds4 Pro’s noise reduction algorithm

How Was Galaxy Buds4 Pro’s Call Quality Tested for the Real World?

To ensure Galaxy Buds4 Pro delivers exceptional call quality in the real world, Samsung brought the real world into the lab using massive wind simulators to recreate acoustic scenarios based on actual location recordings.

This image is AI-generated and is for illustrative purposes only. It depicts a lab used to test the technology behind Galaxy Buds4 Pro’s crystal-clear calls.

In addition to lab testing, Samsung conducted extensive field tests in the noisiest everyday environments including bustling cafes, loud department stores and echoing train stations. They even tested call quality while walking outdoors late at night and riding in cars with the windows rolled down — all to perfect the earbuds’ performance in truly authentic, real-world scenarios.

Ultimately, Galaxy Buds4 Pro proves relentless engineering and technological innovation can shatter the physical limitations of true wireless earbuds. By merging an intricate Sensor Fusion technology with highly optimized algorithms — and validating it through exhaustive real-world testing — Galaxy Buds4 Pro offers an unprecedented level of call clarity, helping you find your voice, anywhere.

[1] Supported on Galaxy Buds Live and subsequent models

On March 4 in Barcelona, Samsung Electronics tuned out the noise of Mobile World Congress (MWC) 2026 with a half-day, multi-sensory Sound Immersion event. The Sound Immersion event is an immersive meditation experience designed to awaken the five senses with Galaxy wearables. The invited guests, including journalists and content creators, were offered a restorative pause through guided meditations inspired by the Spanish way of living — delivered via the immersive audio of Galaxy Buds4 Pro and enhanced by real-time wellness insights from Galaxy Watch8.

W Barcelona, venue of the Sound Immersion event

 

The Galaxy S26 series, Galaxy Buds4 Pro and the Galaxy Watch8 series on display

Sound Immersion and Real-Time Wellness With Galaxy Buds4 Pro and Galaxy Watch8

Dr. Julie Smith — a clinical psychologist, author and content creator — led a multi-sensory experience demonstrating how sound shapes mood, focus and emotional connection within the Galaxy ecosystem.

 

“The senses are more than tools for getting through everyday life — they are an abundant source of calm and clarity,” she said. During the Sound Immersion event we explored how gentle sensory input, combined with the latest cutting-edge technology, can help us feel more present in everyday life. Sound delivered through Galaxy Buds4 Pro, designed to create tailored, immersive sound experiences, can become a steady anchor for reset, balance and recovery.”

 

Dr. Julie Smith leads a meditation session.

 

Participants wear Galaxy Buds4 Pro and Galaxy Watch8 while listening to meditation music.

 

• Sound and Sight Session: Attendees took part in a meditation session focused on sight and sound, listening to immersive soundscapes through Galaxy Buds4 Pro’s rich Hi-Fi audio. As they slowly observed the Barcelona skyline and relaxed to the sounds of nature, they fully engaged their senses. The ergonomic blade design and deeper bass from a wider woofer supported relaxation and focus. Galaxy Watch8 tracked stress levels before and after the session to highlight the impact of visual and auditory stimulation on well-being.

 

Participants take part in the Sound and Sight Session.

 

Stress levels measured using Galaxy Watch8

 

• Sound, Touch and Smell Session: Inspired by Barcelona’s beaches, citrus notes from a stone diffuser and the aroma of herbal tea filled the air alongside seashells and sand. Participants used enhanced adaptive Active Noise Cancelling (ANC) on Galaxy Buds4 Pro to reduce distractions and deepen focus. Throughout the session, Galaxy Watch8 monitored heart rate to provide real-time feedback on their level of calm.

 

 

Participants take part in the Sound, Touch and Smell Session.

 

Real-time heart rate monitored using Galaxy Watch8

 

• Sound, Taste and Touch Session: Attendees savored antioxidant-rich Mediterranean cuisine while listening to calming music delivered through Galaxy Buds4 Pro focusing on the flavors, aromas and textures of each dish. Meanwhile, Galaxy Watch8’s Antioxidant Index measured skin carotenoids to provide insight into antioxidant levels.

 

“Stepping away from the bustle of MWC with the Galaxy ecosystem and seeing the changes in my body made me realize how technology can effectively support rest in everyday life,” said an influencer who attended the event.

 

Participants take part in the Sound, Taste and Touch Session.

 

Antioxidant Index measured using Galaxy Watch8

A Global Wellness Journey From New York to Barcelona

The Barcelona event marked the latest stop in Samsung’s global wellness initiative. Since debuting at Galaxy Unpacked in New York last year, the series has expanded to the Vredestein 20km de Paris and Galaxy Unpacked 2026 in San Francisco, where a California-themed sound immersion led by sleep scientist Dr. Vanessa Hill offered moments of calm amid the launch-day bustle.

 

Participants take photos after the event.

 

By creating restorative pauses, the events illustrate how Galaxy innovations support well-being — even in crowded, noisy environments.