It is a kind of Digital Television Broadcasting System. This system consists of network, Digital Television Broadcasting Transmitting system, and Digital Television Broadcasting Receiving system. The Digital Television Broadcasting Transmitting system is composed of MPEG-4 codec, scramble system, IP data stream multiplexer, and modulator. The Digital Television Broadcasting Receiving system is composed of tuner, demodulator, TS data stream demultiplexer, descramble system, and MPEG-4 decoder. This system has high compressibility, and can handle MPEG-4 program.

This invention shows encryption system of computer mainboard and its encryption method. The encryption system consists of CPU, BIOS memory, encryption processor, and reset control circuit. Its BIOS memory and encryption processor both connect CPU via bus. Due to adding the password check in the procedure of BIOS start-up, the mainboard is encrypted when it boots up. After the reset control circuit receiving signal from encryption processor, it is forced to send reset signal to CPU to make computer mainboard restart. The encryption system and encryption method can make computer mainboard and embedded application system encrypt effectively.

The fingerprint encryption security industrial control system includes industrial control computer, fingerprint collection module, and electric lock. The industrial control computer includes BIOS with function of fingerprint processing, which integrates standard BIOS, fingerprint identification module, finger database, and main management module. The main management module includes authentication module for entering CMOS setup, authentication module for entering system, key-press Lock/Unlock module, electric lock control module, and authority setup module. Due to adopting fingerprint encryption, this industrial control system improves the security. Besides, on account of adopting key-press Lock/Unlock module, there is no necessary for the legal users to turn off the computer when leaving temporarily, which is convenient for users'control. Owing to adopting electric lock control module, the industrial control chassis cannot be illegally opened.

This invention shows a multifunctional Gateway and its communications method. Its hardware includes system control chip, flash memory, synchronous dynamic random access memory, exterior network interface module, interior network interface module, access point module, internet telephone module, serial port module and power supply module. Its software includes device driver, real-time operating system, internet address conversion, exchange software, firewall, internet phones, access point, etc. This Gateway can simplify the network topology and reduce network maintenance and management. As more kinds of function integrate, the completeness of the system will be improved greatly.