Clear voice calls remain one of the biggest challenges for true wireless earbuds. The problem is simple: an earbud microphone sits much farther away from the user’s mouth than a smartphone microphone, creating a difficult engineering battle between human speech and surrounding noise. Samsung’s Galaxy Buds 4 Pro takes a different approach with AI and Sensor Fusion tech for clear calls.

Instead of relying on a single microphone system to fight noise, Samsung rebuilt the voice capture pipeline around Sensor Fusion technology, combining multiple hardware inputs with an AI-powered processing system designed specifically for a compact wearable form factor.

Galaxy Buds 4 Pro uses multiple sensors to rebuild your voice

The foundation of Sensor Fusion is the combination of three microphones and a Bone Conduction-based Voice Pickup Unit (VPU). Two external mics capture the user’s voice from the surrounding environment, while the internal mic analyzes speech signals inside the ear.

The VPU adds another layer by detecting physical vibrations generated when a person speaks. This allows Galaxy Buds 4 Pro to understand voice characteristics beyond traditional audio capture, giving the system additional data to separate speech from unwanted background sounds.

This hardware synergy helps the earbuds reconstruct the user’s voice with greater accuracy, even in challenging conditions like crowded streets, busy cafes, or noisy transportation environments.

Samsung shrunk AI processing for a tiny earbud

Behind this capability is a Deep Neural Network (DNN), an AI model designed to identify and separate human speech from environmental noise. The challenge was bringing this level of computation into a device small enough to fit inside an earbud.

Samsung optimized the entire AI architecture for on-device processing, reducing the required computational workload to around 10% of the original demand. The model size was also reduced to roughly 30 percent.

Protecting voice detail

Galaxy Buds 4 Pro’s upgraded algorithm analyzes past, current, and predicted sound data to adapt instantly. Samsung says the system captures 16 times more vocal detail compared with previous generations.

Normal movements can create small gaps that allow external noise to enter. By comparing signals from internal and external microphones, Galaxy Buds 4 Pro detects these “fit leakages” and adjusts audio processing in real time.

Galaxy Buds4 Pro’s Sensor Fusion system shows how Samsung is addressing the core limitation of wireless earbuds, using smarter hardware coordination and optimized AI processing rather than simply adding more microphones.

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