English 
Chinese Imagine a crowded, noisy conference room. Air conditioning humming, chairs scraping, and multiple people talking at once. Can your smart device “hear” who is speaking? More importantly, can it pinpoint their exact direction and automatically cue the camera?
This isn’t science fiction—it’s the core of HiChatBox, a professional voice interaction system designed for intelligent terminals. Today, we’re peeling back the curtain on the “Acoustic Brain” behind HiChatBox: the Microphone Array and Source Localization Algorithms.
1. Why One Microphone is No Longer Enough
A single microphone is like a “deaf ear”—it captures sound but lacks spatial awareness. In complex environments, it struggles with:
- Background Noise: Getting drowned out by fans or traffic.
- Reverberation: Sound bouncing off walls creating “muddy” audio.
- Distance: Losing clarity as the speaker moves away.
The Solution: The Microphone Array. By using multiple high-SNR MEMS sensors (like the SISTC WBC series) in a coordinated spatial distribution, we give devices “Spatial Hearing.”
2. The Secret Weapon: GCC-PHAT Algorithm
How does the system know where sound comes from? It measures the TDOA (Time Difference of Arrival).
HiChatBox utilizes the GCC-PHAT (Generalized Cross-Correlation with Phase Transform) method. Unlike simple correlation, PHAT ignores volume fluctuations and focuses purely on the phase (timing) of the sound wave.
The result? Sub-sample accuracy with an error margin of less than 0.1ms. Even in a reverberant room, the system remains locked on the speaker’s coordinates.
3. From “Locating” to “Focusing”: Beamforming
Once the speaker is found, the system shines an “acoustic spotlight” on them. This is Beamforming (Delay-and-Sum).
- Locate the direction ($\theta$).
- Calculate the micro-delays for each mic.
- Align and Sum the signals.
This process amplifies the target voice while canceling out noise from other directions, achieving a Signal-to-Noise Ratio (SNR) boost of over 10dB.
4. Engineering the Perfect “Ear”: The SISTC Advantage
At Wuxi Silicon Source Technology (SISTC), we know that great algorithms need great hardware. Our AMM-GY6335-Pro (360° Omnidirectional) and AMM-DP60-4 (60° Directional) modules are built to satisfy the “devilish details” of HiChatBox engineering:
- Synchronous Sampling: Zero-latency I²S/USB data flow.
- Mic Consistency: Factory-calibrated MEMS sensors for uniform phase response.
- Thermal Compensation: Dynamic speed-of-sound adjustment for varied environments.
Conclusion: The Future of Interaction
The synergy between HiChatBox algorithms and SISTC hardware is what makes “说到就录，录到就清” (Recorded as spoken, clear as recorded) a reality. Whether it’s for digital humans, service robots, or 4K video conferencing, a superior voice interface starts with a superior set of ears.
Looking to integrate HiChatBox-level performance into your next product?
