Monitoring System On Long-distance Audio & Video Frequency Ground On DSP & Wavelets Compressed Technique

Now ,we are in the Age of the development of electronic ,computer and network technology, with the demands of social security and monitoring system , as well as its change with each passing day, research departments are adopting some advanced technologies so that they can make it take on real time of speed, clearness of voice and image, multiplex way of data gathering, and wireless transmission. At present the fastest processor to fit control is DSP, and with advanced technology of wavelets compression and wireless network transmission, the monitoring system is made more advanced. This paper mainly discusses the following content: 1 Wavelets Compress Technology It provides the concept of the continuous wavelets transform, the disperseization of wavelets transform, and steadiest condition of discrete wavelets. The wavelets image compress is a high efficiency which ground on multiresolution analysis. The basic idea : the function f in L2 (R) is expressed as a drive out imminent limit, which makes every approach become a function expression which has more and more centralized smoothness, and each resolution is different. Multiresolution analysis is that people can know image information in different resolution according to a series of detail. Based on the analysis, the author puts forward Mallat arithmetic: the analysed function will be divided into "fuzzy image"with different scale and detail supplement. In the application of wavelets to dealing with and compressing image, symmetry wavelets can reduce phasic delay of dealing with image, and the edge of an image is least distortion in biorthogonal wavelets. It emphatically describes the two dimensional wavelets transform,the bases of wavelets choice and structure, as well as bases of wavelets'structuring measure and characteristic analyse. It treats of Mallat of two dimensional wavelets transform , image compression and analyse, eliminating noise, mutation signal measurement, the structure and arithmetic coming true of wavelets edge measurement, essentiality sequence of bit plane. The details are as follow: According to the arithmetic bases of Image Compression with Set Partitioning in Hierarchical Trees (SPIHT): its a high efficiency set partitioning method ,and compact of essential information can get all right image compress effect in no follow-up entropy coding. Coding characteristic and coding principle of Embedded Zerotree Wavelets is an image divide into j degree via disperse wavelets transform. The most importance is low frequency subgraph LL k, next are LH k and HL k, the least is high frequency HH k in the same image; but in the image with different degree the high, the more important; the lower, the less important. 2 DSP Principle Today, in computer control TI's TMAS320C6455 is most advanced embed device, operation frequency is 1MHz. This paper describes the basic architecture of TMS320C6000 series. It provides TMS320C6455 architecture: adopting Harvard Architecture, program and data are respectively independent in different memories address, adopting pipeline architecture, mighty calculation function, high speed instruction cycle and monocycle instruction of composite function, high speed memory in device. 32KB L1P Program Cache, 32KB L1D Data Cache, vcp2 , tcp2 , 64-Bit/133MHz EMIFA(SRAM, Flash, EPROM, SBSRAM, ZBTRAM, FPGA, CPLD, ASICs, etc) , and 32-Bit DDR2-500 SDRA, EDMA, SERIAL PORT, HPI,PCI,I2C, McBSP, 10/100/1000EMAC, UTOPIA,and so on. The introduction of the hardwarized. It is composed of CPU core, peripheral equipment and memory. CPU core including program fetching unit, instruction distributing unit, instruction coding unit, 32 x32-bit register, 2 data path, control register, control logic, test, emulator and intermittent logic. It detailedly discusses the design of DSP device software and hardware, the interface of exterior memory, and the design base on TMS320C6455 principal and subordinate system hardware. It detailedly provides the interface design of TMS320C6455 and GDDR3, 1394b, physics link layer, I2C, and so on. It provides floating-point operation, floating point numbers format, basic floating point numbers method, and the like. And it expatiates on exploitational tools CCS3.1, C/C++ language exploitation, and the mixing programme of C/C++ and assemble language. 3 Audio Frequencies and Video Frequency Transmission Technology It mainly discusses the adopting technology of the Metropolitan Area Network: MAN ---IEEE802.16. l QPSK is characterized by the digital information with carrier wave of four different phases. l Quadrature Amplitude Shift Keying (QAM) is a carrier wave keying signal with the same phase and orthogonal 2-way carrier wave, using amplitude keying method to send digital information independently. It is the characteristics of using bandwidth, antinoise strongly. l The basic principle of OFDM technology: first divide the given channelinto many orthogonal sub-channel, then use a sub-carrier wave brewage on every orthogonal sub-channel, and make sub-carrier waves transmit in parallel. The whole channel is not flat abd has frequency selectivity, but each sub-channel is relatively flat, narrowband transmission is on every sub-channel is signal bandwidth is less than the correspondence bandwidth of channel, this can greatly weaken disturbance among signals. Carrier waveS of sub-channel are orthogonal one another and their frequency spectrum are superposina each other, and therefore the disturbance among sub-carrier waves can be decreased, the frequency spectrum availability is also improved. l FDD pattern: in detach (the interval is 190MHz between two orientation frequency) two symmetry frequently channels, the system receives and sends through frequency range ensures the separation of receiving and sending channels. l In TDD mobile communication system, the receiving and sending in the different time slot of the same frequency channel (carrier wave) use ensuring time range to separate receiving and sending channel. l The main factor of influencina distance transmission includes transmitted power, transmitting antenna gain, loss in transmission, receiving antenna gain,and sensitivity of a receiver, etc. It also expatiates on XDSL transmission technique. 4 Frame Synchronization Technique It emphatically mentions the continuity pad method ,bark code and intermittent pad method. l Continuity pad method is the synchronization method of focus insert frame synchronization code in every frame head. First the code of frame synchronization must have local autocorrelation characteristic of acuity singlet, secondly the special code is not easy to be seen so that it is convenient to identify. Finally frame synchronization recognizer needs to be as simple and easy as possible. l Bark code's special rule: if a n-bit bark code { }x 1 ,x2,x3,Λ,xn and every code unit can get +1 or -1 ,it must be satied to the condition: ( )= ∑=??? + ?=<<= + 0,1,10jnR jn-jxxnj0i1i ij当当. ⑶It is intermittent pad method that inserts a frame synchronization code in every other certainty amount information codes . The certainty request for choice. The main principle: easy to recognize in sink, the code mold is distinguished with frame synchronization code mold.5 Audio Frequencies and Video Frequency Synchronization Technique It emphatically treats of pilot signal phase-lock.The adjusted signal frequency spectrum vector is 0, meanwhile modulation signal needs to be properly handled, the frequency spectrum vector has no room to swing a cat in to adjusted the signal about carrier frequency, here ,the so-called "quadrature carrier"carrier wave pilot frequency is the least influence after inserting transpose 90°.