New Development of Traditional Laser Listening Technology in the Internet of Things Era
The hardware design adopts the ESP32 microcontroller as the core,and uses Ⅳ conversion circuit,high gain amplification circuit,noise filtering circuit,and PCM encoding circuit to achieve the functions of receiv-ing,amplifying,denoising,and demodulation of laser signals,and restore the original voice signal.Using PCM speech encoding technology,the ESP32 microcontroller is used to control the encoder to perform analog-to-digital conversion on the recovered speech signal,and the MQTT protocol is used to upload it to the cloud server for pro-cessing.The software is centered around MQTT cloud servers and programmed using PYTHON language.After re-ceiving digital audio information,voice playback is achieved.And in conjunction with a self-made GUI interface,speech recognition technology and keyword abstract extraction technology are utilized to achieve functions such as converting speech signals into text and generating summary reports.After practical testing,it shows that the device has convenient data transmission,flexible and compact devices,non-contact,traceless,and can be systematically deployed to a wider range of areas and environments,making it very suitable for the monitoring needs of action per-sonnel in key locations.
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