摘要:
A data compression and decompression apparatus and method providing a high compression ratio. The data compressing apparatus includes, for example, an obtaining section, a first coding section, a first controlling section, a judging section, a second coding section, and a second controlling section. Characters are obtained one after another from a compression target. A code is then output corresponding to the character when the character and a predetermined number of characters are not identical. Subsequently, the number of characters obtained are counted when the character and the predetermined number of characters are identical, and a code corresponding to the number of characters counted is output when the character obtained is not identical with the predetermined number of characters.
摘要:
In a data compressing apparatus, when a data input unit inputs unit data, a coding unit obtains an order corresponding to the input unit data and outputs a code corresponding to this order with reference to a compression table. When completing this coding process, a compression table updating unit changes the order of the unit data in the compression table in a self-organizing manner based on only that order. In a data restoring apparatus, when a code input unit inputs the code as a result of the compression, a data restoring unit obtains another corresponding to the inputted code and outputs the unit data corresponding to this order with reference to a restoration table. When completing this coding process, a restoration table updating unit changes the order of the unit data in the restoration table in the self-organizing manner based on only that order.
摘要:
A fiber optic gyro can overcome the defects encountered with conventional fiber optic gyros of phase-modulation method, closed-loop system with serrodyne modulation and digital modulation. A reference phase difference .DELTA..beta. and a ramp phase difference .sigma. are generated in an interference light intensity signal I by use of a triangular waveform, i.e., delta serrodyne waveform signal. The reference phase difference .DELTA..beta. is changed to constant values .DELTA..beta..sub.A and .DELTA..beta..sub.B whose absolute values are the same and whose signs are different at every times T.sub.A and T.sub.B. A phase x of the interference light intensity signal I becomes equal to x=.DELTA..theta.+.sigma.+.DELTA..beta.. The ramp phase difference .sigma. is controlled so as to satisfy .DELTA..theta.+.sigma.=0. Accordingly, at the stable point of the control loop, a Sagnac phase difference .DELTA..theta. is equal to the ramp phase difference .sigma.. Further, a phase x of the interference light intensity signal I does not contain the Sagnac phase difference .DELTA..theta., and hence x=.DELTA..beta.. Also, a fiber optic gyro can eliminate a bias, in particular, optically-generated bias. In a fiber optic gyro of phase-modulation method or delta serrodyne system, a phase controller is supplied with a phase control voltage signal V.sub.S of period T and a square wave signal V.sub.2 of period T for correcting an optical bias caused by an amplitude modulation generated by the phase control voltage signal V.sub.S in the added form. The square wave signal V.sub.2 has a constant magnitude H and is inverted in polarity at points in which the phase control voltage signal V.sub.S is maximized or minimized. The magnitude H and the polarity of the square wave signal V.sub.2 are selected such that an optical bias is minimized.
摘要:
The present invention relates to a method of and an apparatus for compressing/decompressing data, to improve the compression ratio of sliding-dictionary-type Ziv-Lempel codes. A sliding-dictionary-type data compression method finds a matching character string in a coding character string and in a coded character string stored in a dictionary 101. According to the length of the matching character string, the method chooses a raw data mode that codes the matching character string that must consist of a single character as it is, or a reproduction mode that codes the position and length in the dictionary 101 of the matching character string. The method allocates consecutive numbers to different codes to be prepared under the raw data mode and reproduction mode. The method relates any code prepared under one of the raw data mode and reproduction mode to a corresponding one of the consecutive numbers, codes the number according to a code book, and rearranges the code book to shorten the length of the code of the number.
摘要:
In a data compressing and decompressing apparatus, having improved efficiency and enhanced compression ratio whereby character sequence of received data is coded and decoded by referring to a dictionary related to the last character of the immediately preceding character sequence, and a character sequence which is one character extended character sequence of the coded and decompressed character sequence is registered in the dictionary in relation with the last character of the immediately preceding character sequence so that the compression ratio of the coding of data is increased.
摘要:
A printing device includes a barcode area dividing unit that divides a barcode area of a printing sheet into plural division areas along a Y direction, and a barcode area ejection amount conversion and output unit that controls an ink jet printing unit to print black bars such that an X direction is a direction in which the black bars and white bars are alternately arranged and occupancy dimensions of ink of pixels are different in the division areas divided by the barcode area dividing unit.
摘要:
A data management system including a storage and activating an application so that the application accesses contents in the storage and processes the contents. The data management system also monitors access of the application to the contents by associating information for the application brought into an activated status with information for the accessed contents. The data management system also enciphers the contents with the application information when the activated application writes the contents into the storage while deciphering the contents with the application information when the activated application reads out the contents.
摘要:
An exposure system includes an exposure apparatus and a fluid supplying apparatus that supplies fluid to the exposure apparatus via flow channels. The fluid supplying apparatus includes a fluid sending unit, a heat exchanger, a first temperature sensor that measures the temperature of the fluid, a filter that removes unwanted substances in the fluid, and a heater disposed downstream of the filter in the fluid supplying apparatus for adjusting the temperature of the fluid. The exposure apparatus includes a second temperature sensor that measures the temperature of the fluid supplied from the fluid supplying apparatus. The heater adjusts the temperature of the fluid on the basis of the information on the temperature measured by the second temperature sensor.
摘要:
A printing apparatus is provided with a line-type ink jet head having a plurality of blocks on each of which a set of ink ejection elements are arranged. In the printing apparatus, a drive voltage signal is accompanied with a prepulse to be applied to each ink ejection element. Particularly, drive signal adjustment values are stored in association with each block. The drive voltage signal is generated for each set of ink ejection elements with reference to the drive signal adjustment values in association with the block on which the each set of ink ejection elements are arranged. By this configuration, it is possible to reduce the differential density between the image portion printed by the imperfect block having misaligned nozzles and the image portion printed by the normal block having nozzles arranged in their correct positions throughout the density range.
摘要:
A heat exchange method which uses a heat exchange unit for exchanging heat between first and second media to adjust a temperature of the first medium. The method includes (a) a detection step of detecting temperatures of the first and second media to enter the heat exchange unit, and (b) an adjustment step of adjusting a flow rate of the second medium based on the temperatures of the first and second media detected in the detection step. The adjustment step includes (i) a target heat quantity calculation step of calculating a target heat quantity based on a target temperature of the first medium and the temperature of the first medium detected in the detection step, (ii) a first temperature difference calculation step of calculating a first temperature difference based on the target temperature and the temperature of the second medium detected in the detection step, (iii) a setting step of setting a provisional target flow rate of the second medium, (iv) a second temperature difference calculation step of calculating a second temperature difference based on the target heat quantity, the provisional target flow rate, and the temperatures of the first and second media detected in the detection step, (v) an average temperature difference calculation step of calculating one of a logarithmic average temperature difference and an average temperature difference at the heat exchange unit based on the first and second temperature differences, (vi) a heat exchange quantity calculation step of calculating a heat exchange quantity at the heat exchange unit based on one of the logarithmic average temperature difference and the average temperature difference and a heat exchange gain of the heat exchange unit, and (vii) a determination step of determining a target flow rate of the second medium based on a result of a comparison between the heat exchange quantity and the target heat quantity.