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    HIGH-SPEED FOURIER TRANSFORM OPERATING DEVICE
    51.
    发明专利
    HIGH-SPEED FOURIER TRANSFORM OPERATING DEVICE 失效

    公开(公告)号：JPS5878255A

    公开(公告)日：1983-05-11

    申请号：JP17569281

    申请日：1981-11-04

    Applicant: HITACHI LTD

    Inventor： ABE SHIGEO ,  BANDOU TADAAKI ,  HIRASAWA KOUTAROU ,  IDE TOSHIYUKI

    IPC: G06F17/14 ,  G06F15/332

    Abstract: PURPOSE:To stabilize the operation of the device, by providing a buffer between a pipeline multiplier and a pipeline adder and storing the multiplication result in the buffer temporarily and executing the addition after the disturbance disappears in the pipeline processing of the adder. CONSTITUTION:A buffer due to a 2-port register 2 is provided between a multistage pipeline multiplier 1 and a multistage pipeline adder 5 to constitute a butterfly operator 100. A selector 3 is provided between the output of the register 2 and the adder 5, and a register 4 is connected between the output of the adder 5 and the selector 3. This operator 100 is used in a high-speed Fourier transform operating device, and one data is written in one machine cycle by the register 2, and the selector 3 and etc. are used to read two data simultaneously. The output from the multiplier 1 is written in the register 2 temporarily, and the output of the register 2 is inputted to the adder 5 simultaneously, thus stabilizing the operation of the operating device.

    METHOD OF CONTROLLING TWO OR MORE ENGINES
    57.
    发明专利
    METHOD OF CONTROLLING TWO OR MORE ENGINES 失效

    公开(公告)号：JPS5623527A

    公开(公告)日：1981-03-05

    申请号：JP9735579

    申请日：1979-08-01

    Applicant: HITACHI LTD

    Inventor： IMAI MASUMI ,  HIRASAWA KOUTAROU

    IPC: F02D41/34 ,  F02D21/08 ,  F02D35/00 ,  F02D45/00 ,  F02P5/02 ,  F02P5/15

    Abstract: PURPOSE:To facilitate cut-in or draw-out of a program to or from an entire system by establishing a group of programs independently of each other so that a cut-in or draw-out of a program will not affect the entire system. CONSTITUTION:A multiprogram, which is designed to control two or more engines, is provided with execution priorities and engine start cycles which are dependent on the number of start requests for cut-in to a digital controller is then computed by this system and, when the number for a program reaches a start cycle, a flag for execution is memorized by that program. Execution is finally made for a program having the highest priority.

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