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I will do smart voice interface hardware and mems microphone arrays
About this Gig
Need high-accuracy voice capture for an AI or IoT device? I design custom Voice User Interface (VUI) hardware featuring professional MEMS microphone arrays.
I optimize the acoustic path and electronic hardware to maximize Wake-Word Detection (WWD) and Automatic Speech Recognition (ASR) performance.
What I Do:
Custom MIC Geometry: Circular, linear, or matrix topologies tailored to your case enclosure.
Signal Integrity Tracking: Precision trace impedance matching for high-speed PDM/I2S clock lines.
Noise Mitigation: Strict power supply filtering (PSR/PSRR) to remove power supply hum from audio lines.
Integration: Seamless pairing with Espressif (ESP32), Raspberry Pi, STM32, or dedicated voice DSPs.
Deliverables: Schematics, multi-layer layout, 3D STEP file for acoustic housing, and a production BOM.
Specialization:
Circuit design
•
Layout
File format:
Gerber
•
STEP
•
Software:
Altium Designer
•
KiCad
Interface:
I2S
•
TDM
•
SPI
•
I2C
FAQ
What is the benefit of a digital PDM MEMS microphone array over analog microphones?
Digital PDM microphones provide superior noise immunity over long trace distances, eliminate the need for an external analog-to-digital converter (ADC), and are highly optimized for direct connection to modern voice processors handling wake-word detection or beamforming algorithms.
How do you prevent digital clock noise from bleeding into the audio capture line?
I isolate high-speed digital clock lines (BCLK/MCLK) away from sensitive analog return paths, implement uniform trace-length matching for tightly synchronized PDM data paths, and use dedicated local decoupling capacitors to suppress power supply noise.
