34results about How to "Improve addressing speed" patented technology

The invention relates to a compressing and processing system for JPEG2000 images. An image wavelet converting unit decomposes an original image into wavelet coefficient blocks according to JPEG2000 algorithm to be transmitted to a memorizer; a wavelet coefficient reading and controlling unit reads the coefficient blocks from the memorizer according to a preset scanning order to be transmitted to a wavelet coefficient caching unit; a wavelet coefficient coding unit composed of DSP encodes the coefficient blocks; each DSP sends out data-exchanging requests to be transmitted to a priority controlling unit, so as to conduct priority ranking; each DSP reads the corresponding coefficient blocks from the wavelet coefficient caching unit according to a priority order; the wavelet coefficient coding unit transmits the encoded coefficient blocks to a coding coefficient caching unit; a code stream optimizing and intercepting unit reads all the coefficient blocks and a corresponding interception point and a distortion value from the coding coefficient caching unit, then seeks a group of interception points which have the smallest distortion at the formulated compressed code rate according to Lagrance algorithm and, and intercepts a part of the code stream of each coefficient block, so as to be output to the exterior after being spliced with assistant information after encoded by RS.

The invention provides a communication method for improving the security of a radio frequency identification system. The communication method mainly comprises the steps as follows: adding a space for pre-storing a high-permission access password in a physical storage space of a label and a driver for sending an instruction with a preset format in a mapping rule of a read-write device, and enabling the label to identify and respond; checking and opening the label, and feeding back a random number according to a random number obtaining instruction sent by the read-write device; sending the instruction with the preset format including an xor result of the random number and a key to the label by the read-write device; comparing the analyzed key with the high-permission access password by the label, and sending a key update instruction including the length and the content of a new key to the label by the read-write device after the label is in a high-permission state; and enabling the label to update the key and replace the pre-stored high-permission access password. Therefore, the problems of a large amount of keys stored in the traditional database, long key access time and low system security due to the periodicity of the key are solved.

The invention aims to provide a table lookup optimization method, which comprises the following steps of: a, representing numerical controlled oscillator (NCO) forms corresponding to different television audio carrier frequencies by using a reference form; b, shortening and optimizing the reference form to a 1 / 4 length, and obtaining other non-reference forms from the reference form; and c, further optimizing and storing the reference form according to sine regularities to obtain a sine value and a cosine value by once addressing. The invention also provides a numerical controlled oscillator utilizing the table lookup optimization method, which comprises a form unit, a counting unit, an addressing unit, a splitting unit and a multiplication unit, wherein the form unit is set in a read-only memory (ROM), and stores NCO form data optimized by the table lookup optimization method; the counting unit counts the input television audio carrier frequencies, and takes a count as an index value; the addressing unit addresses the form unit to obtain required NCO form data; the splitting unit splits the required NCO form data into the sine value and the cosine value; and the multiplication unit receives the sine value and the cosine value, and multiplies the sine value and the cosine value by the input television audio carrier frequencies respectively.

A superimposed DHT-based addressing system and method for hierarchical host identification, each addressing server in the system has the same structure, and is equipped with: a node joining and exiting processing module, an information maintenance module, a route lookup module, The mapping record information storage module and the establishment and maintenance module of the superimposed DHT structure. The addressing method is to first establish a superimposed DHT: to hierarchically transform the non-semantic host identifiers used in the network, add an area identifier indicating the location of each node, and then divide each node into different areas, and establish Respective regional DHTs, and finally all regional DHTs are superimposed together to form a global DHT; when routing lookup and forwarding, based on the superimposed DHT, the next hop in the route is selected first in the regional DHT to minimize cross-regional Routing times to improve routing efficiency; each registration / update operation is performed simultaneously in two DHTs to achieve load balancing and economic fairness.