A device for calling emergency operational services to provide voice communication between the driver of a two-wheeled vehicle and the operator of the ERA-GLONASS system

Objectives. The aim of the study is to improve road safety by developing an emergency call device for drivers of twowheeled vehicles, as the most vulnerable road users, and improving their technical equipment.

Methods. In the course of the study, the characteristics of the acoustic signal transmission channel and the processes accompanying its propagation were analyzed. When studying the parameters of voice communication, noise reduction, echo cancellation and echo compensation methods were used, as well as algorithms for converting acoustic information implemented in the hardware and software of the device.

Results. The results of practical implementation are presented: the design of a prototype device, its integration into the dashboard of a two-wheeled vehicle. During the design of the device, the control features of a two-wheeled vehicle, the influence of external factors and climatic conditions were taken into account. An implementation of the interface of interaction between the driver of a two-wheeled vehicle and the operator of the ERA-GLONASS system is proposed, taking into account the specifics of its use. Structural schemes of an echo compensator and a dual speech signal detector using an adaptive filter are presented. The algorithms implementing these processes and the possibility of their adaptation to the tasks of the emergency call device are considered. The procedure for automatically adjusting the amplification of the acoustic signal of the speech range is described, an analytical description of the technical problem and the applied methods of digital processing are given. A structural diagram of the test stand, software for qualitative analysis of the acoustic signal, visualization of the test results of the prototype are presented, and the effectiveness of the proposed solution is evaluated.

Conclusions. The results of a study on the design of an emergency call device have shown that the use of analog and digital speech signal processing algorithms implemented in the device’s codec and modem will ensure a highquality level of voice communication between the driver and the emergency services operator. 

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