High and new technology into intelligent building intercom

High and new technology into intelligent building intercom
In the intelligent information technology, information network, globalization and the informationization of the national economy today, intelligent building as the information superhighway of nodes and the information port
Wharf, has manifested its important role in the fields of economy, culture, science and technology. Application of new technology in intelligent building intercom system of
And more high.
1, hybrid technology
Transfer the processing of digital electronic computers are digital signal is not continuous, but encountered in practice are mostly analog signal, analog
The amount of the analog sensor into electrical signals, control required by the analog / digital conversion into digital signals can be input to the digital system processing. Die
/ three steps number conversion: sampling, quantizing and coding. The process of sampling the analog signal is discrete in time, make sampling signal; a quantitative extraction
Amplitude discrete sample signal into digital signal; coding the digital signals into digital system can accept form.
2, communication technology
Now the wireless communication has been developed rapidly in the global range, wireless data services to provide the means of communication becomes a new hot spot. Mesh
First, the operators, manufacturers and content providers are very positive work, has launched a Bluetooth technology, wireless LAN technology, communication technology, 485
The rapid development of technology, the wireless business plays an important role in the.
3, image processing
The rapid development and wide application of digital technology makes the human society has entered the digital age "". Today, digital technology products have entered ordinary people
Daily life. Digital technology is the use of digital coding to describe and express image, voice and other media information. The information processing process is: Die
To be information, digital, compression, storage or transmission, decoding representation. Among them, coding is a key link. Digital image and sound
Signal data is very large, for example, a 640 * 480 pixel medium resolution color images (24bit/ pixels) amount of data about 7.37Mbit/ frame
If is, moving image, playing at 30 frames per second or 25 frame rate, video signal transmission rate is 220Mbit/s; if the signal
On the 650MB CD-ROM, CD-ROM can only play 20 seconds. So, it is necessary to compress the digitized information, using a little data table
As information, save the transmission and storage overhead.
3, the IC card technology
Non contact IC card, also known as induction card, was born in the early 90's, because of the advantages of magnetic card and contactless IC card unparalleled, so that one of the Q
The world, immediately aroused widespread concern, and at an alarming rate applied. Non contact IC card by the IC chip, the induction antenna, and completely
Sealed in a standard PVC card, no exposed part. Non contact IC card reading and writing process, usually by a non-contact type IC card and reader through
Radio waves to complete the read and write operation, communication frequency between two to 13.56MHZ.
Non contact type IC card itself is passive body, when the reader on the card read and write operations, signals from reader is composed of two parts: a superposition
Is the power signal, the signal received by the card, with its own L/C resonance, produce an instant energy supply to the chip. The other part
Is a combination of data signal, command, modify, chip for data storage, and return to the reader. Formed by the non-contact IC card reader system,
Both the hardware structure, and operation process is greatly simplified, and at the same time, with the help of advanced management software, offline mode of operation, the
Data read and write process more simple.
4, the broadband network technology
Broadband access network based on Ethernet technology by the board side equipment and the user side equipment, a local side device is located in the District, the user side equipment in general
Located in residential buildings; or agency side equipment in commercial buildings, and the user side equipment located in the floor. A local side equipment and IP backbone network interface, use the
The user side equipment with 10/100BASE-T interface is connected with a user terminal computer. Station side apparatus with aggregate user side equipment information management function.
In the broadband access network based on Ethernet technology, only the link layer function user side equipment, working in the MUX (multiplexer) mode, the user
In the physical layer and link layer are isolated from each other, so as to ensure the safety of user data. In addition, the user side equipment can be dynamically in the control station side equipment
Change the port rate, so as to ensure the highest limited access rate access users, the minimum rate, support for service QoS assurance. For the multicast service
The Bureau, side equipment control of the multicast group and group member, user side equipment only perform the multicast copy controlled, do not need the multicast group management
Sure. A local side device also supports user authentication, authorization and accounting and user dynamic allocation of IP address. In order to ensure the safety of equipment, the station side
Internal management channel logic is applied independently between the device and the user side equipment.
In the broadband access network based on Ethernet technology, a local side equipment is different from the router, the router maintenance is port network address mapping table, and the Bureau
Side equipment maintenance is port host address mapping table; the user side equipment is different from the Ethernet, Ethernet switches isolation unicast data frame, not isolation
Data frame is broadcast address, and the user side equipment complete function is just the multiplexing and de multiplexing Ethernet frame.