Firstly,it was assumed that the interceptors knew enough information such as the mode of en/decoding,the constructing mode of address code,the transmission rate of the system,the value and quantity of wavebands,etc.

It uses permuted watermark to generate address codes, then finds the corresponding position in DCT domain blocks of host image and changes the coefficient value of the neighboring pixels according to a chaotic pseudo-random sequence.

Methods Dynamic address code design and automatic compositor algorithms were integrated into the software design,while the running out was eliminated by adopting watch dog chip.

Introduce two access codes used in synchronized OCDMA system-internal recycling prime code and synchronous square prime code,then analyzes their performances respectively and compared them with the signal interference ratio and the multiple access interference bit error rate,results show that synchronous square prime code is better than recycling prime code in their relativity.

At the request of the access code of the CDMA system,the chaotic multilevel digital sequence (CDMS),a new access code,is proposed,which has the advantages of the chaotic analog sequence and the chaotic binary digital sequence.

Properties of the access code m sequences and GOLD code used for CDMAsystem are analyzed in theory.

For the Flexibility, the FPGA could achieve address decoding and the calculation of signal amplitude and then control the signal attenuation base on the amplitude.

Phase lock oscillator, address coding and intermission mode are taken to stabilize the system and to promise the target s working period longer than 10 day.

This paper introduces the main principle,system structure and software design of vidio tape image storing and archiving system which was controlled by microcomputer It also expounds the operational process of single frame image archiving by address cod

On the basis of analyse in depth the function characteristics and corresponding signal actions of external bus port of ADSP2106X, this paper discussed the problems such as address distribute and address coding needed to be considered as expanding external memories and interfaces for ADSP2106X,and presents the concrete design examples.