Product Overview

I2S Linear MEMS Microphone Array Front-End for AI Robotics

Modern robots require reliable voice perception capabilities to achieve natural human-machine interaction.

In real-world environments, robot voice systems face challenges including:

• Motor and mechanical noise
• Cooling fan interference
• Environmental background noise
• Long-distance voice commands
• Multiple sound sources

The GSMI-4025-I2S provides a complete digital audio front-end solution by combining:

• 4-channel linear MEMS microphone array
• Synchronized digital audio acquisition
• DSP-based acoustic processing
• AI noise reduction algorithms
• Beamforming technology

The module outputs high-quality digital audio through the I2S interface, allowing direct integration with embedded processors and AI computing platforms.

Key Features

1. 4-Channel Linear Forward MEMS Microphone Array

The GSMI-4025-I2S integrates four digital MEMS microphones arranged in a linear forward-facing array structure.

The synchronized multi-microphone architecture provides:

• Improved front-direction voice pickup
• Better spatial audio information
• Enhanced speech recognition performance
• Multi-channel audio data for AI processing

Compared with traditional single microphone solutions, the linear array design provides better voice capture capability for robots and intelligent devices.

2. I2S Digital Audio Output for Embedded AI Systems

The key advantage of the GSMI-4025-I2S is its native I2S digital audio interface.

The module can directly connect with:

• Robot main controllers
• ARM processors
• AI SoCs
• Embedded Linux platforms
• Edge computing devices

Advantages of I2S Interface

• Low-latency digital audio transmission
• Direct connection with processor audio interfaces
• Reduced system complexity
• Easy integration into customized hardware platforms
• Suitable for secondary algorithm development

The module provides an ideal audio front-end solution for robot developers who need direct access to synchronized multi-channel microphone data.

3. Synchronized 4-Channel Digital Audio Acquisition

The four microphone channels are sampled using a synchronized clock architecture to maintain audio consistency.

This provides reliable multi-channel audio data for:

• Beamforming algorithm development
• Sound source localization (SSL)
• Direction of arrival (DOA) estimation
• Voice enhancement algorithms
• Robot acoustic perception systems

4. Integrated DSP Audio Processing Platform

The GSMI-4025-I2S integrates a high-performance DSP audio processor.

Processor features:

• 32-bit RISC core
• Maximum operating frequency up to 320MHz
• DSP instruction acceleration
• Floating-point algorithm processing

The integrated DSP supports real-time audio processing without requiring additional external audio processors.

5. AI Noise Reduction and Voice Enhancement

The built-in AI noise reduction algorithm separates:

Human voice signal + Environmental background noise

to improve speech clarity in challenging environments.

Noise suppression performance:

Up to 30dB

depending on application conditions.

Supported environments:

• Robot operating noise
• Fan noise
• Mechanical vibration noise
• Industrial background noise
• Public environments

6. Advanced Acoustic Algorithms

Beamforming (BF)

Multi-microphone beamforming technology enhances the target voice direction and reduces interference from unwanted sound sources.

Benefits:

• Improved voice pickup accuracy
• Better speech recognition
• Enhanced far-field interaction

Acoustic Echo Cancellation (AEC)

AEC technology reduces echo caused by:

• Robot speakers
• Voice playback systems
• Interactive terminals

Improves full-duplex voice communication performance.

Noise Suppression (NS)

Suppresses:

• Stationary background noise
• Non-stationary environmental noise

Dynamic Range Control (DRC)

Optimizes audio signal levels and maintains consistent voice output quality.

Technical Specifications

Application Areas

AI Robots and Intelligent Machines

The GSMI-4025-I2S is designed for:

• Humanoid robots
• Service robots
• Companion robots
• Educational robots
• Delivery robots

Applications:

• Voice command recognition
• Human-machine conversation
• Wake word detection
• Intelligent interaction

Autonomous Mobile Robots (AMR)

Suitable for:

• Mobile service robots
• Industrial inspection robots
• Smart logistics robots

Benefits:

• Reliable voice acquisition
• Noise-resistant communication
• Embedded system integration

AI Edge Devices

Applications:

• Smart cameras
• Intelligent terminals
• Voice-controlled devices
• Edge AI systems

Sound Perception and Acoustic AI Development

The synchronized microphone array provides multi-channel audio data for:

• Sound source localization (SSL)
• Acoustic perception
• Voice enhancement
• Spatial audio algorithms

Secondary Development Support

The GSMI-4025-I2S is designed for customers who require customized audio algorithm development.

Supported customization:

• Audio parameter adjustment
• DSP configuration
• Microphone gain optimization
• Algorithm integration
• Host-side AI processing

Compatible platforms:

• Embedded Linux
• Android systems
• AI computing platforms

Acoustic Design Recommendations

For optimal performance, customers should consider:

• Microphone placement relative to speakers
• Distance from cooling fans
• Acoustic chamber design
• Microphone port structure

Proper acoustic design improves:

• Beamforming performance
• Noise reduction effectiveness
• Voice pickup distance
• AEC performance

Reliability Performance

The module supports reliability verification including:

• Thermal shock testing
• High temperature bias testing
• Low temperature bias testing
• Temperature and humidity testing
• Mechanical shock testing
• Vibration testing
• Drop testing
• Reflow testing
• ESD testing

Why Choose SISTC GSMI-4025-I2S?

With more than 15 years of experience in MEMS microphone technology and acoustic solutions, SISTC provides advanced audio sensing solutions for global AI hardware developers.

Our capabilities include:

✔ MEMS microphone array design
✔ Digital audio interface solutions
✔ DSP audio processing
✔ AI noise reduction algorithms
✔ Beamforming technology
✔ Robot voice interaction solutions
✔ OEM/ODM customization

SISTC helps customers build next-generation intelligent devices with reliable voice perception and advanced acoustic performance.

OEM / ODM Customization

SISTC provides customized microphone array solutions:

• Microphone quantity customization
• Array structure optimization
• I2S interface customization
• Acoustic tuning
• Algorithm parameter adjustment
• Firmware customization