Showing papers on "Division (mathematics) published in 1980"

Multiplexing Low-Speed Buffered Data Terminals

Abstract: When terminals (data and/or voice), connected to an asynchronous time division multiplexer (ATDM), are buffered and operate at low speed, the arrivals at the multiplexer are correlated. In this paper, we consider the finite buffer behavior of an ATDM with such terminals. An earlier study by Rudin [6] is a special case of this approach. The treatment here is also an improvement over the analysis by Birdsall et al. [1] of an ATDM with speech sources and is suitable for packet voice applications.

Time division switching system control arrangement

Abstract: TIME DIVISION SWITCHING SYSTEM CONTROL ARRANGEMENT Abstract A time division switching system having distributed control processors is disclosed. The distributed processors exchange control messages and cooperate in the completion of talking paths between subscribers. Each control message includes an address portion defining the destination for the control message and is transmitted to a time-shared space division switch on the same time multiplex lines that speech representations are transmitted. Control messages are routed by the time-shared space division switch to a control distribution unit where the address portion is interpreted. When the address portion defines a distributed processor which controls the time-shared space division switch, the control distribution unit transmits the associated control message directly to that processor. Alternatively, when the address portion defines one of the other distributed processors, the control distribution unit transmits the associated control message to the defined processor via the time-shared space division switch. The switching system also includes arrangements for utilizing the control message communication features in the completion of communication paths between subscribers.

Divisional reading device for sine signals

Abstract: A device for dividing two sine signals out of phase with each other obtained from a detector in accordance with a position change and to enable a greater resolution and accuracy in the determination of displacement comprises a division circuit connected to the detector to provide an output representative of the ratio of the two sine signals, and conversion means for causing the output of the division circuit to correspond to a displacement.

Multiple/divide unit

Abstract: An arithmetic unit which enables speedup of operation in a system for division and/or multiplication by setting specific logical conditions for a decoder. Such specific logical conditions allows elimination of adding means which are essential in known arithmetic units to constitute the division and multiplication system in combination with the decoder.

A method for the automatic generation of triangular elements on a surface

Abstract: An algorithm is given to discretize a polygon or curved surface into triangular arrays. The method first involves the manual division of the array into quadrilaterals with specified numbers on rows and columns. The individual points are then filled in automatically and elements are automatically generated. A point of particular importance is that the number of columns or rows may be made to change. A subroutine is given to perform this task.

Divisor transform type high-speed electronic division system

Abstract: An electronic network division system is operated responsive to signals representing divisors and dividends. An input divisor signal is divided into a given number (N) of integers, the number (N) being selected on a basis of a desired accuracy index. Each divided signal is a transform of a divisor which is read from one of (N) number of read-only memories, there being a separate read-only memory for each of the given number (N) of integers. Each of said given number of transformed divisor signals is separately multiplied by a dividend signal to produce (N) number of multiplication products. Each of these multiplication product signals is divided into high and low subproduct signals and applied to a corresponding one of (N) number of adders. A high subproduct signal from one multiplication product is added in the adding means to a low subproduct signal from another multiplication product.

Method of and apparatus for manufacturing a plastic pipe comprising longitudinally extending hollow channels in its wall

Abstract: Method and extruder for manufacturing plastic pipes provided with longitudinal channels in its wall. Before the extrusion nozzle of the extruder, the stream of plastics to be extruded for forming the pipe is subdivided into two concentric annular streams flowing through two annular division channels formed by means of a dividing member being retained by only a breaker in the outer division channel, the other division channel forming a free passage between the channel inlet and the outlet.

Two methods for the solution of the dynamic programming algorithm on a multiprocessor cluster

Abstract: The dynamic programming algorithm is examined with a view to solving it on a multiprocessor cluster. The two methods of control-space division and state-space division are proposed, and their efficiency is analysed in detail. A practical example is given to illustrate the two methods using a two-processor system, and the results are projected to find the minimum achievable time and optimum number of processors for this example.

Optical path signal generating apparatus

Abstract: PURPOSE:To obtain an optical path signal generating apparatus having explosion- proof safety, by forming transmission optical path and reception optical path between light emitting device and photo detector provided in the signal processing part of the first division, and optically switching the optical path in the second division. CONSTITUTION:A light emitting device 22 and a photo detector 23 are provided in a signal processing part 21 to convert the optical pulse into electric signal, and a circuit to count the number of pulses thereof is built in. The light emitting device 22 and photo detector 23 are made to correspond to each one end of an optical fiber 24 forming a transmission optical path and an optical fiber 25 forming a reception optical path. The optical fibers 24, 25 are led into explosion-proof division, with the ends thereof being faced to the site 26 to detect the opening degree of a valve. A disc 27 with slit is provided on a valve shaft 29 to count the ON/OFF switching of light, so that the valve opening degree may be distinguished. There is no risk in explosion-proof countermeasures, and the constitution may be simplified.

Division by noninteger numbers using synchronous oscillators

Abstract: A synchronous oscillator is provided to divide the frequency of an input signal by a noninteger number, the noninteger number being expressed as the ratio of two whole integers X/Y. The oscillator is tuned to the desired output frequency, whereby every Yth cycle of the output signal is synchronized by every Xth cycle of the input signal at the negative (and possibly positive) peak of the output signal, thereby effecting a simultaneous multiplication and division of the input frequency of Y and X respectively. A pulse forming network provides the input signal in the form of pulses, whereby synchronization is effected at precise points in time. Pulse width and amplitude are adjustable to vary the input signal energy.

Electric motor coil element and method of manufacturing the same

Abstract: An electric motor coil element embodying this invention is manufactured by the steps of closely winding a single wire about a columnar bobbin to provide a cylindrical original winding having a diameter d, setting a 2n number of equal division points on the periphery of said cylindrical original winding to divide said periphery into equal parts, specifying the bending lines which pass through the equal division points at prescribed angles φ 1 and φ 2 to the reference lines which are set in parallel with the axis of said cylindrical original winding and pass through said equal division points, and bending the segments of said original cylindrical winding is such a manner that said bending lines project alternately inward and outward along the periphery of an imaginary block form having a prescribed shape.

Radix conversion system

Abstract: Radix conversion apparatus which converts an input number in a first number system into an equivalent output number in a second number system by performing a plurality of successive divisions in accordance with a divide-by-radix iterative equation. A plurality of serial dividers are provided for performing the successive divisions required by the divide-by-radix iterative equation in a manner such that each division is serially performed beginning with the most significant input dividend digit and each output quotient is serially produced beginning with the most significant output quotient digit. The serial dividers are successively arranged so that each can begin its respective division as soon as the first quotient digit is produced by the previous serial divider.

Channel system in remote control time division electronic exchange system

Abstract: PURPOSE:To make it possible to reduce the number of transmission pathes with reducing the traffic intensity applied to digital transmission pathes by storing multiplexing voice signals from the incoming side and outgoing side into a time division switch and folding and connecting local call through this switch. CONSTITUTION:Subscriber's telephone sets 21 and 22 have remote stations which are line-concentrated by space time division switch 23, and this remote station is connected to the master station through digital transmission path 26. Here, time division swtich 30 is provided between switch 23 and transmission path 26, and switch 30 stores multiplexing voice signals from coder and decoder 24 and interface circuit 25 in the incoming side as well as the outgoing side, and local call can be folded and connected through switch 30. As a result, since local call passes through no channel of the master station, the traffic intensity applied to the digital transmission path is reduced, and the number of digital transmission pathes can be reduced.

Strength reduction for division and modulo with application to accessing a multilevel store

Abstract: A method for replacing certain division and modulo operations by additions and subtractions is presented. This optimization allows efficient and easy use of partitioned arrays to access a multilevel store.

Time division electronic switching system

Abstract: A time division electronic switching system including, as main structural elements, a central processing unit, a multi-frequency signal receiver unit, a signal processor and a time division switch including a speech path memory. Dial information from a subscriber or from another telephone office is detected in the multi-frequency signal receiver unit, the output of the multi-frequency signal receiver unit is written into the speech path memory, and an access circuit reads out the information written in the speech path memory and supplies it to the signal processor as read out information.

Manufacture of runner for water mills* etc*

Abstract: PURPOSE:To obtain high-quality, low-priced runner even with a large size by a method wherein runner division pieces are cast and, after their water flow portion is adjusted in shape, combined into an unitary body by welding their divided faces to each other. CONSTITUTION:A runner crown 1 is equally divided at the division line b indicated by dotted line (a) which does not pass the connection of the crown 1 and a runner blade 2 with each other, and a runner band at the division line (d) indicated by broken line (c) which does not pass the connection of the band 3 and the blade 2 with each other. The runner division pieces of which each is made of the crown 1 having one piece or a plurality of pieces of the runner blade 2 and the division pieces of the band 3 are casted and, after their flow portion is adjusted in shape, combined into a unitary body by welding the division faces of the runner division pieces to each other.

Device for detecting passage of traveling body through predetermined point and current position thereof

Abstract: PURPOSE:To provide the subject method comprising disposing a tuning type coupling coil on a traveling body traveling on a constant traveling road thereby to improve the reliability and stabilize the cost. CONSTITUTION:In an area determined along the traveling road there are laid a cross type parallel two-line system induction line 1 and a non-cross type parallel two-line system induction line 2, and a terminal resistor 3, couplers 5 and 6, and a position detector 7 are connected thereto, and tuning type coupling coils 4 and 4' are placed at a predetermined distance L2 in the traveling direction on the traveling body C0. As a result, when the tuning type coupling coil 4 or 4' not present in a division A or B, the signal output of induction line 2-coupler 6 is retained on the zero level, when the traveling body C0 travels in the right or left direction and the coil 4 or 4' advances in the division A or B, a signal wave from the induction line 1 is induction-coupled via the coil 4 or 4' to the induction line 2, the coupling input of the induction line 2 being phase-inversed in the division A and the division B in accordance with the phase inversion from the induction line 1 in the border of the crossing part, and supplied as input through a coupler 6 to a position detector 7. Hence, the position of the traveling body C0 is detected at high accuracy without providing a power source at the traveling body C0 side.

Exposure information display device of camera

Abstract: PURPOSE:To accurately performing the grasping of the luminance condition of the subject field and make possible photographing in desired exposure conditions by simultaneously displaying mean photometric vlaue and spot photometric value and displaying both while, if necessary, maintaining these. CONSTITUTION:The mean photometric vlaue of the subject image observed in the finder and the spot photometric value in the finder are stored while being renewed in latch circuits 5, 6 by turning on of a photometric switch. Phopometric vlaue information is renewed in a latch circuit 8 and is numerically displayed 11. Next, when a switch SW1 is pushed by beforehand determining the desired angle of view, the contents of the latch circuit 9 are maintained wothout being renewed and the information of the step number differences of the spot photometric value of the next operating point of the SW1 is held in the latch circuit 18. In a display device 21, displaying of the step number difference of the latch circuit 17 or 19 based on the information of the latch circuit 6 and the step number difference which the latch circuit 18 holds is accomplished in the form of time division.

New frequency division circuit using b.b.d.

Abstract: A new frequency division circuit using b.b.d. is proposed. Division is carried out by comparing the phase difference between the original signal and the delayed one through b.b.d. Experimental results agree well with the theoretical values.

Average running speed display unit

Abstract: PURPOSE:To make it possible to display automatically the average running speed from the strat time by forming this unit by a run signal generator, a run counter, a time signal generator, a time counter, an operation circuit and a display equipment. CONSTITUTION:By turning on switch 11 simultaneously with starting a car, run counter 3 and time counter 4 are set to zero, and pulses generated from run signal generator 1 and time signal generator 2 from the wheel start time are counted by counters 3 and 4 respectively. In division circuit 6, the number of pulses counted by run counter 3 is divided by the number of pulses counted by time counter 4. Next, in multiplier circuit 7, the mumeric obtained by division circuit 6 is multiplied by a preseribed constant stored in storage circuit 8, and the average running speed is obtained and displayed digitally on display meter 9.