Design of smart dual-microphone front-end system for speech interaction of portable field medical equipment
10.19745/j.1003-8868.2024212
- VernacularTitle:面向便携式野战医疗装备语音交互的小尺寸双麦前端系统设计
- Author:
Jun-Peng TIAN
1
;
Yong-Jie ZHENG
;
Jia-Yang ZHANG
;
Feng TONG
;
Ji-Yang DONG
Author Information
1. 第九○九医院(厦门大学附属东南医院),福建漳州 363000;厦门大学电子学院,福建厦门 361005
- Keywords:
field medical equipment;
speech interaction;
microphone;
front-end system;
speech enhancement
- From:
Chinese Medical Equipment Journal
2024;45(11):39-43
- CountryChina
- Language:Chinese
-
Abstract:
Objective To design a small-size dual-microphone front-end system to solve the problems of the portable field medical equipment in speech interaction due to noises in field conditions.Methods The system realized small-size dual-microphone beamforming based on the least squares criterion and then implemented front-end speech enhancement,which was composed of dual microphones(SMD micro electro mechanical system microphone),a signal preprocessing module,an embedded processor(STM32F405 series processor),an analog to digital converter(ADC),an digital to analog converter(DAC)and a power supply module.The signal preprocessing module,ADC and DAC were built into the general-purpose audio encoder WM8978,and a LM1117 voltage regulator chip was adopted as the power supply module.Keil μ Vision4 development software was used for software compiling and testing.Directivity experiment and speech enhancement experiment were carried out to verify the performance of the system.Results Directivity experiment showed that the system gained high directivity consistency at each frequency point in the frequency range of 0.5 to 2.0 kHz;speech enhancement experiment indicated that the system effectively improved the sound quality and recognition rate of speech under the conditions of three types of non-smooth noises,namely,gunshot,alarm of the monitor and collision of the medical utensils.Connclusion The system developed can realize speech enhancement to facilitate speech interaction of the portable field medical equipment.[Chinese Medical Equipment Journal,2024,45(11):39-43]
