Smart electronic devices are playing a fundamental role in modern home and industrial applications. The increased reliance on such devices, especially in time critical and secure applications, intensifies the need for time synchronization among multiple devices. This work presents a novel audio-based, cheap, offline synchronization method, whereby multiple slaves synchronize simultaneously to a master within a single room. Synchronization is carried out under the proposed protocol in a way that is independent of the physical location of the target devices, which in turn are not required to have any sort of network connectivity. The proposed method relies on the transmission of a De Bruijn sequence that holds the information required for the slaves to synchronize. The effectiveness of the proposed synchronization protocol is validated through an in-house experimental setup. Synchronization at distances of up to 250 cm between the master and a slave was achieved.

智能电子设备在现代家庭和工业应用中发挥着重要作用。对此类设备的日益依赖，尤其是在时间关键和安全的应用中，加剧了多个设备之间时间同步的需求。这项工作提出了一种新颖的基于音频的、廉价的、离线的同步方法，即多个从设备同时同步到一个房间内的一个主设备。同步是在提议的协议下以一种独立于目标设备的物理位置的方式执行的，而目标设备又不需要任何类型的网络连接。所提出的方法依赖于 De Bruijn 序列的传输，该序列包含从站同步所需的信息。通过内部实验装置验证了所提出的同步协议的有效性。实现了主站和从站之间最远 250 cm 距离的同步。