SU436348A1 - - Google Patents

Description

one

The invention relates to the field of computer technology and can be applied as a comparison element in information processing devices, in digital computers, in discrete systems of automatic control, measurement, and control, in photo recording devices of processes when setting time delays or setting time scales, in devices pulse width modulation, etc.

Number comparison devices are known, made using mechanical, electrical and magnetic elements, differing from each other in various degrees of economy, reliability, complexity and speed.

A device for comparing numbers is known, which contains shift registers, inverters, reset valves, switches, AND, OR circuits, and, for the purpose of simplifying it, it contains one reset valve for each shift register; the control inputs of all reset valves are connected to the output of the AND circuit, the second input of each reset valve is connected via a switch either directly or to the inverse output of the corresponding shift register, and the output of each of these valves is connected to the reset circuit of the same shift register.

However, the performance of known number comparison devices remains small.

The proposed device is characterized in that the coincidence circuit is made in the form of an optical system consisting of a source of plane-polarized light, a first signal receiver and interposed on the same optical axis of cells with differentially controlled anisotropy, the control inputs of which are connected to the outputs the corresponding bits of registers, starting with the lowest bit, and after each cell with differential-controlled anisotropy, parallel polarizers are installed with separate outputs, polarized rays in mutually perpendicular planes, some of which are connected through cells with differentially controlled anisotropy to the input of the subsequent polarizer, and the second to other photodetectors that are connected to the outputs of the corresponding bits of one of the registers and to the inputs of the circuit evaluation of the results of the comparison.

The block diagram of the proposed device is shown in the drawing.

A device for comparing binary numbers contains registers 1 and 2, having separate outputs from each bit, a coincidence circuit 3 placed between source 4, plane-polarized light and photoreceiver 5, composed of successively located on the optical axis of the cells 6 c

differential-controlled anisotropy and separated from each other and from the photodetector by 5 parallel polarizers 7. Polarizers 7 have separate outputs polarized in mutually perpendicular planes of light rays and are oriented so that the rays of plane-polarized light from source 4 pass through them, Do not change direction (output “equivalence”) and hit the photodetector 5 if the polarization plane retains its original position. Rays of light change the direction of propagation, falling on the photodetector 8 (output "unequal"), if the plane of polarization of light is rotated under the action of the control signal. Thus, light rays, the plane of polarization of which coincides with the plane of polarization of light from source 4, can affect the photodetector 5, and only light rays that are polarized in the plane perpendicular to it can affect photoreceivers 8.

Cells with differentially controlled anisotropy are switched bitwise between the outputs of the corresponding bits of registers 1 and 2, starting with the least significant bit from the photodetector 5, so that they are affected by a control signal equal to the difference between the output signals of registers 1 and 2.

Photodetectors 8 are connected to the outputs of the corresponding bits of one of the registers 1 or 2 and to the inputs of the circuit 9 for evaluating the results of the comparison. The drawing shows the connection of the photodetectors 8 to the bit outputs of the register 1.

To simplify the drawing, the power supply circuit as well as the input circuit of the numbers being compared and resetting the registers to zero are not shown, but their presence is assumed. The choice of the type of photodetectors 5 and 8 is determined from considerations of providing a given speed, efficiency, etc. When choosing a material for the manufacture of cells 6 with differentially controlled anisotropy, also proceed from specific operating conditions. Materials and substances that have the ability to become anisotropic under the action of a control signal can be used.

When the source of plane-polarized light is off, the signals at outputs A and B of the device for comparing binary numbers are absent. In the initial position in all bits of registers 1 and 2 there are low potentials corresponding to, for example, zero meters. When turning on the source 4 of plane-polarized light, the light flux passes through a sequence of cells 6 with differentially controlled anisotropy and polarizers 7, falling on the first photodetector 5. Cells 6 transmit light without changing the inclination of the polarization plane, since the potential difference at the control inputs of each of them is zero and they possess the optical properties of uniaxial isotropic crystals. Polarizers 7 also transmit light because they are oriented accordingly.

At output A of the device, a signal appears corresponding to the identity of the numbers contained in registers 1 and 2. All photodetectors 8 are not illuminated and have low dark conductivity. Scheme 9 Comparison scores are closed. There are no signals at the output of the JB device. The circuit is ready to go.

Suppose that a binary number O ... 010 is entered into register 1. Then, cell 6 with the differential controlled anisotropy of the second bit of the coincidence circuit 3 will be given a control signal equal to the difference between

high potential at the output of the second bit of register 1 and low potential at the output of the second bit of register 2. Under the action of the control signal, cell 6 becomes duplicating, and the polarization of the light passing through it changes the slope depending on the value of the control signal ; the magnitude of the latter is chosen such that at the output of the active cell the rotation of the plane of light polarization is + 90 ° with respect to the initial position.

Then the luminous flux changes the direction of propagation in the polarizer 7 of the second bit of the coincidence circuit 3 and falls on

photodetector 8 second bit. The photodetector 8 opens and retransmits the output signal of the second bit of register 1 to the input of circuit 9 for evaluating the comparison results. The next bit of the match 3 light pattern

will not pass.

Since the photodetector 8 in the case under consideration is connected to the high-potential output of register 1, then at the input of circuit 9 the control signal corresponding to one is in turn.

The output to the device will be a signal, meaning that a number greater than that in register 2 is recorded in register 1. Now in register 2 we enter, for example, the binary number O ... 011, and in register 1 we keep the same.

The control inputs of cell 6 with differential controlled anisotropy of the second bit of the coincidence circuit 3 will be included

between the high-potential outputs of registers 1 and 2. In this case, the difference control signal on this cell will be equal to zero and the light will pass through it, without changing the polarization plane. The photodetector 8 of the second discharge will be closed, since the light of the polarizer 7 will be passed to the input of the cell 6 of the first discharge of the coincidence circuit 3 connected between the high-potential output of the first discharge of register 2 and the low-potential output of the first discharge of register 1. The light polarization plane rotated 90 ° after passing the cell of the first discharge and following it, polarizer 7, the light will be directed to the photodetector 8 of the first discharge. Photo detector 8 from