Industrial Technology Research Institute

National Cheng-Kung University

Kun Shan University

Han-Chiang Chen

Shua-Yuan Lai

Jhing-Fa Wang

Jia-Ching Wang

Zhong-Zhen Wu

Lung-Chih Kuo

Ping-Tsung Wang

Ming-Fang Wu

Yun-Fei Chao

Ming-Chi Shih

The present disclosure relates to a grouped multi-device anti-loss warning system with multiple warning devices categorized as one group in which the warning devices granted an identical Group ID and not divided into mater/slave devices communicate with one another; a warning message can be activated among these warning devices in which contacts are disabled for broadcasting a notification that a group member (warning device) is considered as being out-of-touch within a preset period and fulfilling an anti-loss effect by mutual reminders among warning devices in the same group.

Grouped multi-device anti-loss warning system and a method for executing the same

A method and an apparatus for encrypting/decrypting packet data of a precise time synchronization protocol and a time synchronization system are illustrated. The method is suitable for the time synchronization system using a precise time protocol. The time synchronization system includes a master node and a slave node, wherein the slave node synchronizes its time with the master node. In the method for encrypting/decrypting packet data of the precise time synchronization protocol, an encryption/decryption hardware device is disposed on the hardware protocol layer of each of the master node and the slave node. The hardware protocol layer is under the data link layer, and includes the data link layer. A synchronization message is encrypted by using the encryption/decryption hardware devices of the master node to generate a frame data, and the frame data is decrypted by using the encryption/decryption hardware devices of the slave node to obtain the synchronization message.

Method and apparatus for encrypting/decrypting packet data of precise time synchronization protocol and time synchronization system

Provided are a network slave node and a time synchronization method using precision time protocol-like (PTP-like) in a network. The network slave node includes a packet detection unit for detecting whether the slave node receives or sends a synchronization protocol packet and recording a synchronization protocol packet receiving time and a synchronization protocol packet sending time; a hardware clock; and a control unit controlling the packet detection unit and the hardware clock. The control unit reads out the packet receiving time and the packet sending time from the packet detection unit and informs a local master node. The local master node calculates a time offset between the local master node and the slave node, and informs the control unit. The control unit adjusts the hardware clock based on the time offset so that the local master node and the slave node are time synchronized.

Network slave node and time synchronization method in network applying the same

In a communication network, a network connection apparatus accepts timing information of a grand master to achieve timing synchronization. Next, the network connection apparatus requests slave nodes to be in timing synchronization with itself to achieve the timing synchronization. Even when the grand master is removed or crashed, when a new slave node is added, or when a hack node tries to hack the communication network, the network connection apparatus still periodically requests the slave nodes to be in timing synchronization with itself so that the timing synchronization inside the communication network is not negatively affected.

Network connection apparatus and communication system and method applying the same

The present invention includes a method for speech encoding and decoding and a design of speech coder and decoder. The characteristic of speech encoding method relies on the type of data with high compression rate after the whole speech data is compressed. The present invention is able to lower the bit rate of the original speech from 64 Kbps to 1.6 Kbps and provide a bit rate lower than the traditional compression method. It can provide good speech quality, and attain the function of storing the maximum speech data with minimum memory. As to the speech decoding method, some random noises are appropriated added into the exciting source, so that more speech characteristics can be simulated to produce various speech sounds. In addition, the present invention also discloses a coder and a decoder designed by application specific integrated circuit, and the structural design is optimized according to the software. Its operating speed is much faster than the digital signal processor, and suits the system requiring fast computation speed such as multiple line encoding; its cost is also lower than the digital signal processor.

Growing community of inventors

Tainan, Taiwan

Han-Chiang Chen