The Motionless And Motion Images Compressing Technology Research Based On Wavelet Transform

With the quickly development and widely application of communication technology, communication network is gradually enlarging. The electromagnetic interference may have effects on information transmission. How to avoid the electromagnetic interference between more then two equipment and to improve the quality of information transmission is the main point, which is concerned in communication equipment Manufacture for a long time. However, communication cabinets take a great part in electromagnetic interference shielding, not only solving the problems such as packaging, support, dustproof, waterproof, but also acting as a key role in the realization of electromagnetic interference shielding.With the need for work, and facing the complaint from USA users about rusting in CDMA Cabinet shielding area and antisepsis to Beijing C&W Technology CO., LTD (Switching Equipment Manufacturing Company), this paper describes integrated and deep research on electromagnetic technology of communication cabinets, involving principle for shielding, choice of shielding material, formation of cabinets shielding case, connected area shielding etc. The cause for the above-mentioned deficiency has been found out through many test and testing, and then the plan for process improvement has been proposed. Communication cabinets produced using improved process meet the requirements by USA users.After studies the conclusions are as follows:(1) Connected area should be reasonably selected when the thickness of electric paint as to processing surface is determined;it is also proved that the thickness of electric paint is independent of the electric performance through testing, while electric performance has relationship with the density of electric grains only.(2) How to deal with the juncture between the electric-lacquer of connected area and the layer of insulating-plastic has been optimized.(3) The problems such as partial rustiness, shielding capability descending complained about by customer have been disposed.(4)The need for joint design of electromagnetic shielding, antisepsis and dustproof has been Considered.