introduction Voice interception is a kind of high-tech, secretive compulsory investigation measures adopted in response to new changes in criminal means. It can make up for the deficiencies of conventional investigative measures in the investigation of criminal facts, and combat serious crimes or special Types of crime play an indispensable role. The existing voice listening equipment mostly adopts the wired transmission mode. To complete the voice listening task, the line laying needs to be completed first in the listening area. Some wireless voice listening equipment mainly uses the laser or radar to realize the wireless transmission of voice information. . The power consumption of common voice listening nodes is relatively large, mainly in the process of voice processing, encoding and wireless transmission. It is not difficult to find out the existing voice listening equipment; the randomness, complexity and danger of the voice listening area make the wired listening equipment unable to meet the requirements of listening and dispatching anytime and anywhere, and increase the risk coefficient of executing the task. The expensive price of laser and radar makes the wireless listening device used as a communication means not popularized. The high power consumption of voice coding processing and wireless transmission makes it unable to meet the needs of long-term and uninterrupted listening tasks. Therefore, research and design a voice listening node with simple operation, convenient use, wireless transmission and low power consumption, to reduce human resource consumption, reduce the risk coefficient and equipment cost of the task, and realize long-distance and uninterrupted long-distance voice. Listening is important. 1 node overall design Following the modular design idea and the characteristics of embedded system development, according to the requirements of voice listening tasks, the voice listening node designed in this paper consists of three parts: voice perception module, processor module and power module, as shown in Figure 1. The voice sensing module includes a voice collecting unit and a voice encoding unit, and performs voice signal detection, sampling, analog-to-digital conversion, and encoding. The processor module comprises a processor unit, a storage unit and a wireless communication unit, and is not only responsible for data processing, data storage, execution communication protocol, node scheduling management and power control of the entire node, but also responsible for nodes and nodes, nodes and upper computers. The transmission and reception of data and instructions are completed according to a certain communication protocol. The power module provides the energy required for operation of each part of the circuit to maintain the normal operation of the node. Vcsel Module,Vcsel Distance Sensor,Vcsel Laser,Single Mode Laser Module AcePhotonics Co.,Ltd. , https://www.cgphotonics.com
July 17, 2024