Hitachi, Ltd.

Hitachi Denshi Kabushiki Kaisha

Kazuyuki Kodama

Kunihiro Okada

Takeyuki Endo

Yasutaka Shibuya

Tatsuya Murakami

Masaaki Fujinawa

Shigeru Yabuuchi

Eiichi Hadano

Hiromichi Fujisawa

Jushi Ide

Takeyuki Endoh

Takakazu Huno

Atsushi Inoue

Hirotada Ueda

Hitoshi Matsushima

Yoshimune Hagiwara

Hidekazu Takeda

Kenmei Masuda

Yoshiharu Yamashita

Shinya Fujimori

Fukuyasu Abe

Kazunori Kinoshita

Hisashi Ichikawa

Sunao Iwaki

Masashi Ueda

Kenji Keneko

A drum base according to he invention, on which a drum of a magnetic tape recorder is mounted, comprises a substantially annular frame having a fixing surface to which the drum is fixed; at least one through hole extending through the fixing surface for allowing a screw which is to be threadably attached to a threaded hole formed in the drum to pass therethrough; and a pair of mounting surfaces provided on the fixing surface on which the drum is mounted, the mounting surfaces being located adjacent to the at least one through hole so as to have a symmetrical relationship in a circumferential direction of the annular frame with respect to the at least one through hole and within a range of a diameter dimension of the at least one through hole in a radial direction of the annular frame.

Drum base on which a drum of a magnetic tape recorder is mounted

Monochrome multi-color, and full-color documents are automatically discriminated from each other, and character and photograph regions are also determined in an automatic manner, thereby producing appropriate binary image data according to the operation results. An image data transformation apparatus includes a binarizing section for converting image data inputted thereto into binary image data associated with a plurality of different colors, binary image data buffers for temporarily storing therein the binary image data, a decision section for deciding based on the input image data whether the monochrome, color, or multi-color output is to be produced and whether an intermediate-tone or particular color pixel is to be processed, and a binary image data selection/output section for selecting as output therefrom binary image data according to the decision results.

Image data transformation apparatus and image entry apparatus

A data processor and a data transfer method for efficiently transferring data between a plurality of information processing devices as in a client server system. In case non-coded data such as image data are transmitted, it is necessary to make the transmission management requirements such as protocol, data structure, coding scheme, and coding default condition coincide between the transmitting side and the receiving side. In order to satisfy this requirement, a data processor lying between a plurality of information processing devices and having a data transfer intermediary function records beforehand transmission management information including identification information concerning a plurality of clients, discriminates a client by using the identification information, and recognizes transmission management information concerning the discriminated client. In addition, the data processor analyzes transmission data supplied from the server, on the basis of the transmission management information, and converts it to transmission data conformed to the client.

Data processor and data transfer method

Color image processing method and apparatus for suppressing side effects of a chrominance emphasizing process are provided. A chrominance C of an original color image is detected by a chrominance detector. A luminousness V of the original color image is detected by a luminousness detector. A parameter selector selects chrominance conversion parameters on the basis of the chrominance C and luminousness V to generate a selected parameter. A chrominance converter executes the chrominance conversion by chrominance conversion parameters a to i. It is possible to suppress a side effect such that the color deviation becomes conspicuous in a portion of small chrominance and luminousness due to the execution of the chrominance emphasizing process. Thus, image data of a high quality can be obtained.

Color image processing method and apparatus with chrominance emphasizing

A digital signal processor for determining the maximum and minimum values of a plurality of data items wherein operations of an arithmetic logic unit and data memories are controlled by micro-instructions, including a device for decoding specified bits of an operand of the micro-instruction, a device for detecting a value of a condition code which has been designated by an output of the decoding device, and a control device for executing a logical operation between the output of the detection device, which becomes '1' if the value of the condition code is true, and a decoded value of an operation code of the micro-instruction and to generate a control signal for the arithmetic logic unit on the basis of a result of the logical operation.

Digital signal processor suitable for extacting minimum and maximum

In a floating point digital differential analyzer, multiplication and division of constants are carried out by an adder which truncates a summation SDY.sub.i of l secondary increments calculated by ##EQU1## into a third increment having an n-bit mantissa including a sign bit, and an integrator for carrying out an integration of

Floating point digital differential analyzer

In order to deliver an input signal of each operation cycle after a desired time delay, there are disposed data memory means for storing the input signal, counter means for appointing write addresses of the data memory means, and address memory means for appointing read addresses of the data memory means. The address memory means is divided into partial memory areas equal in number to time delay elements, whereupon while sampling the input signal at a predetermined sampling period and changing the count value of the counter means one by one for each of the desired time delay elements at each sampling point, the variations of the input signal in a sampling interval between the particular sampling point and the adjacent sampling point are successively written into the memory means. Further, while changing the contents of the partial memory areas corresponding to the desired time delay element to the number of the time delay elements in each sampling interval, the variations in a sampling interval preceding a predetermined sampling number to the particular sampling interval are successively read out from the memory means. The input signal of each operation cycle in the preceding sampling interval is presumed by an interpolation operation based on the variation and the sampling period, and the result is used as an output signal of the desired time delay element.

Method of generating time delay

In a figure displaying device which generates edge data corresponding to the individual horizontal scanning lines, to display figures on the raster scanning type Braun tube relying upon the edge data, the improvement comprising at least two sets of memory groups which have a capacity corresponding to the number of picture elements at positions of even numbers and odd numbers on the horizontal scanning lines, and which store predetermined data in the addresses corresponding to the picture elements at which edges are present, at least two converter means for converting the data read in parallel from the memory groups into series data, selection means for selecting the outputs of said converter means, and control means for displaying figures on the monitor responsive to the output of said selection means.

High resolution figure displaying device utilizing plural memories for

A figure displaying device operates to display a plurality of fundamental figures each defined by a preset number of vectors on a display device of the raster scanning type. The figure displaying device stores the start and end point coordinates of the respective vectors of the respective fundamental figures and the gradient data of the respective vectors of the fundamental figures, and determines whether the respective vectors are located on a horizontal scanning line or not for each fundamental figure prior to the scanning operation of the horizontal scanning line. If the vectors are located on the horizontal scanning line the gradient data corresponding to the vectors on the aforementioned horizontal scanning line is read out and added to the start point coordinates thereby to renew the start point coordinates. A line memory is provided having a capacity corresponding to the number of picture elements in one horizontal scanning line so that preset data can be stored therein at the address corresponding to the added results and a control circuit is provided for consecutively reading the data out of the address in the line memory, which corresponds to the position of the horizontal scanning line being scanned, thereby to effect the display in accordance with the read results.

Figure displaying device

A figure displaying device for generating a brightness signal which corresponds to a figure information to be displayed as well as for generating a brightness modulation signal which varies within a predetermined first region on a display screen. The device also generates a frequency characteristic control signal which varies within a predetermined second region on the display screen. Furthermore, the display is able to subject the brightness signal to a brightness modulation in accordance with the signal from the modulator generator with the brightness signal being controlled by the frequency characteristics control signal. The resultant figure displayed on a monitor is based on a modulation signal obtained through the modulation generator and the frequency characteristics control generator.

Herein disclosed is a figure displaying device for producing and displaying a figure on a raster scan television. The figure displaying device includes first memory means for storing the vertical and horizontal coordinate values of the stop information of one frame to be displayed and second memory means for storing preset information. Further inclusive is control means for locating such dot information having a vertical coordinate value corresponding to the vertical scan of the television from the first memory means so that the dot information may be stored at the address of the second memory means corresponding to the horizontal coordinate value of the dot information located.

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Kokubunji, Japan

Kazuyuki Kodama