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 programs.

This invention covers the encryption system of computer motherboard and its encryption method. The encryption system consists of CPU, BIOS memory, encryption processor, and reset control circuit. Both its BIOS memory and encryption processor are connected to CPU via bus. Through password check in the procedure of BIOS start-up, the motherboard is encrypted when it boots up. After the reset control circuit has received signal from the encryption processor, it is forced to send reset signal to CPU to make computer motherboard restart. The encryption system and encryption method can make computer motherboard and embedded application system encrypt effectively.

The industrial control system with fingerprint encryption security includes industrial control computer, fingerprint collection module and electric lock. The industrial control computer includes BIOS with the 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 the system, key-press Lock/Unlock module, electric lock control module, and authority setup module. Due to fingerprint encryption, this industrial control system improves the security. Besides, by using key-press Lock/Unlock module, eligible users do not need to turn off the computer when leaving temporarily, thus making user control easier. Provided with electric lock control module, the industrial control chassis cannot be opened without authorization.

This invention covers a multifunctional gateway and its communication 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 functions are integrated, the completeness of the system will be improved greatly.