Abstract: A computing device provides a resonance algorithm to process digital signal data according to a principle of physical resonance. The resonance algorithm determines a division length n of digital signal data according to a frequency f1 of an audio signal to be detected and a sampling frequency f2, which is used for sampling the digital signal data by a coder. Furthermore, the resonance algorithm divides the digital signal data into a serial of data segments by the division length n, and obtains enhanced digital signal data by accumulating a number m of the data segments.

Abstract: In a method for detecting an event occurred in a monitoring area, the method defines a reference characteristic parameter for a specific event, and stores the reference characteristic parameter in a storage device of the computing device. The method further obtains a voice stream of the specific event from an IP camera through a wireless network in real time, and extracts a characteristic parameter from the voice stream using a predefined algorithm. The method compares the extracted characteristic parameter with the reference characteristic parameter, and determines that the specific event occurs in the monitoring area if the extracted characteristic parameter accords with the reference characteristic parameter.

Abstract: A computing device provides a resonance algorithm to process digital signal data according to a principle of physical resonance. The resonance algorithm determines a division length n of digital signal data according to a frequency f1 of an audio signal to be detected and a sampling frequency f2, which is used for sampling the digital signal data by a coder. Furthermore, the resonance algorithm divides the digital signal data into a serial of data segments by the division length n, and obtains enhanced digital signal data by accumulating a number m of the data segments.

Abstract: A data security protection method generates dynamic encryption keys and dynamic decryption keys for a host and a client during data transmission between the host and the client. The host stores a host initial key K0, and determines a host key Kn using a one-way hash function based on the host initial key K0. The client stores a client initial key K?0, and determines a client key K?n using the one-way hash function based on the client initial key K?0. Original data Rn is encrypted as encrypted data Xn using the host key Kn before being sent to the client. The client decrypts the encrypted data Xn using the client key K?n, to obtain the original data Rn.

Abstract: A data security protection method generates dynamic encryption keys and dynamic decryption keys for a host and a client during data transmission between the host and the client. The host stores a host initial key K0, and determines a host key Kn using a one-way hash function based on the host initial key K0. The client stores a client initial key K?0, and determines a client key K?n using the one-way hash function based on the client initial key K?0. Original data Rn is encrypted as encrypted data Xn using the host key Kn before being sent to the client. The client decrypts the encrypted data Xn using the client key K?n, to obtain the original data Rn.

Abstract: A system on chip (SOC) and method displays a graphical user interface (GUI) in a video. The SOC receives a video from the video input device and a GUI from the GUI circuit, and saves the video into a first frame buffer of the SOC and the GUI into a second frame buffer in the SOC. A combined video is generated by combining the video from the first frame buffer and the GUI from the second frame buffer and sent to the display device to display the combined video.