Speech Recognition System Based on Microcontroller

With the rapid development of information technology, smart home system has gradually become a way for people to pursue a better life. This paper takes STM32 microcontroller as the main controller, based on LD3320 speech recognition chip, transmits the recognized voice instructions to the microcontroller, and after the microcontroller receives them, issues instructions to each module so as to achieve the preset results, which has the advantages of fast recognition and high accuracy. This paper describes the design scheme of the system in detail, from the hardware and software design, the main process of the system and the workflow of the LD3320 core. In the hardware design part, the paper discusses the reasons for choosing STM32 and introduces the functional characteristics of LD3320 chip, and analyzes the design ideas of relay circuit and indicator circuit. In the software design, the thesis describes the development process of the speech recognition program. The experimental environment setting, testing process and results are shown in the chapter of system realization and analysis. The experimental results show that the system has a high recognition accuracy in a quiet environment.