On the endpoint AI MCU NuMicro® M55M1 (MCU + NPU) platform, by deploying an on-device AI neural-network model, we enable semantic recognition through multi-keyword spotting + Natural Language Understanding (NLU).
This upgrades traditional “fixed command phrases” into a more natural, free-form voice interaction experience.

•Feature

•Continuous Keyword Detection + NLU: Supports developer-defined control logic
•From Fixed Commands to Free Expressions: Same action can be triggered with multiple phrases, reducing user reliance on “standard commands”
•Redundant Words Allowed: Enables more natural speech, e.g., “Um, I want to turn off the computer’s Wi-Fi”
•Enhanced Natural Interaction: Example: “Set the living room AC to 26 °C”
•Fully Offline Solution: Local processing without network, reducing latency, operational costs, and protecting privacy
•Scalable & Multi-Language Support: Supports over 40 languages globally

•Specifications

M55M1 (32-bit Arm® Cortex®-M55)

•Operating frequency up to 220 MHz
•Ethos‑U55, 220 MHz, 256 MAC, AI performance up to 110 GOPS
•Memory: 1.5 MB SRAM + 2 MB Flash, with HyperBus expansion support
•Connectivity & peripherals: USB HS, 10/100 Ethernet MAC, CAN‑FD, I²C/I3C, SPI/I²S, etc.
•Security: Built‑in security features (e.g., TrustZone, TRNG, hardware crypto accelerators, etc.)
•Applications: Smart home / smart devices offline voice control products

•System Block Diagram