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    • 52. 发明授权
    • Method and apparatus for numerical division
    • 数值分割的方法和装置
    • US4724529A
    • 1988-02-09
    • US701556
    • 1985-02-14
    • Suren IrukullaBimal V. Patel
    • Suren IrukullaBimal V. Patel
    • G06F7/537G06F7/483G06F7/49G06F7/493G06F7/52G06F7/533G06F7/535
    • G06F7/535G06F7/49G06F7/4917G06F7/5375
    • A method and apparatus for radix-.beta. non-restoring division. The division process occurs in four phases. In a first phase, the input operands are transformed to produce a divisor lying in a designated numerical range. Next, a transitional phase involves generating an initial radix-.beta. quotient digit from the transformed numerator. An iterative phase of the process generates successive partial remainders according to a recursive method. From the sign and a single radix-.beta. digit of each of these partial remainders, the process generates a radix-.beta. quotient digit. Further, a fourth phase, which may run concurrently with the transitional and iterative phases, involves accumulating successively generated quotient digits to produce a final quotient value.
    • 基数β恢复分裂的方法和装置。 分割过程分四个阶段进行。 在第一阶段中,输入操作数被变换以产生位于指定数值范围内的除数。 接下来,过渡阶段涉及从转换的分子生成初始的基数β商数。 该过程的迭代阶段根据递归方法产生连续的部分余数。 从符号和每个这些部分余数的单个基数β数字,该过程生成基数β商数。 此外,可以与过渡和迭代阶段同时运行的第四阶段涉及累积连续生成的商数以产生最终商值。
    • 55. 发明授权
    • Calculator for selectively calculating in decimal and time systems
    • US3806719A
    • 1974-04-23
    • US22813972
    • 1972-02-22
    • SUWA SEIKOSHA KK
    • YAMAMURA KGOTO M
    • G06F7/49G06F7/491G06F7/52G06Q30/00G07C1/00G06F7/50
    • G06F7/4915G06F7/49G06F7/4917G06Q30/04G07C1/00
    • A calculating apparatus which comprises circuits for selectively calculating in decimal and hexadic systems, the calculating apparatus further including a switching device to select one of the systems and circuits to supply a carry or borrow correction suitable to the selected system. According to one embodiment of the invention, the last said circuits function to add or subtract a decimal 4 when a correction is to be made for a decimal calculation for a hexadic problem. According to another embodiment, the first said circuits include sequential stages, a shift register coupling said stage, a gate to supply a binary 0110 signal, and a carry/borrow detector coupled to the register and the first of said stages and controlling said gate. According to still another embodiment, the aforesaid circuits collectively comprise a decimal calculator, circuit to supply operands to said calculator to produce a result, a device to examine said result to establish a carry/borrow requirement, flip flops coupled to and actuated by the last said device, gates controlled by the flip flops and by respective timing signals, a further gate controlled in part by the first said gates, a time calculation control switch effecting a complementary control on said further gate, and a correction gate for supplying a binary 0100 signal to said calculator and controlled by said further gate. According to still another embodiment the aforesaid circuits collectively comprise first and second calculator stages, a shift register coupling the stages, first and second correction detectors coupled to said first stage and register to detect decimal and hexedic carry/borrow correction requirements respectively, first and second gates respectively coupled to said first and second detectors and respectively adapted for passing a 0110 decimal correction binary signal and a 1010 hexadic correction binary signal to said second stage, a switch for commanding a time calculation, and an inverter between said gates for selectively and exclusively opening one of said gates to pass a correction signal, the inverter means being controlled by said switch.