SU840955A1 - Device for reproducing coefficients variable in time - Google Patents

Description

triangular functions of time and pulse-width modulator, as well as reduced performance, due to the pulse control of piecewise-linear approximants.

The closest technical solution to the present invention is a device for reproducing time-varying coefficients, comprising a first, second and third counters, an amplifier filter whose output is a device output, two piecewise linear approximators, the switching inputs of which are connected to the corresponding bit outputs of the first counter , the information inputs are the input of the device, and the outputs are connected to the input of the filter amplifier, the inverter whose output is connected to the control input of the first a linear approximator, a square pulse generator, a code comparison unit, a pulse width signal generation unit and a control unit whose output is connected to the control inputs of the square pulse generator and the first, second, and third counters, the output of the square pulse generator connected to the input of the second counter, the bit outputs of the second and third counters, in addition to the output of the senior discharge of the third counter, are connected to the inputs of the code comparison block whose output is connected to the first input of the block and forming a pulse-width signal, the output is higher than the bit of the third counter connected to the input of the first counter and to the second input of the block forming a pulse-width signal, the output of the higher bit of the second counter is connected to the input of the third counter, the output of the block forming a pulse-width signal is connected to the control input of the first piecewise linear approximator and to the input of the inverter 3.

The disadvantage of such a device is reduced performance due to the time-pulse principle of controlling piecewise linear approximators.

The purpose of the invention is to increase speed.

The goal is achieved by the fact that the device for reproducing time-variable coefficients contains the first, second and third counts. A filter amplifier whose output is a device output, two piecewise linear approximators, the switching inputs of which are connected to the corresponding bit outputs of the first counter, the information inputs are the device input, and the outputs are connected to the amplifier input filter, inverter, output connected to the control input of the first piecewise-linear approximator, a square pulse generator, a pulse width signal generating unit, a control unit, the output of which is connected to the control Odam square pulse generator and the first, second and third counters, the output of the square pulse generator is connected to the input of the second counter, the output of the higher bit of the third counter is connected to the input of the first, counter and information input of the pulse width signal generating unit, the output of the high bit Yes, the second counter is connected to the input of the third counter, the output of the pulse-width signal generation unit is connected to the control input of the second piecewise-linear approximator and to the input of the inverter In addition, it contains a code-frequency converter, the inputs of which are connected to the bit outputs of the second and third counters, except for the high bit output of the third counter, and the output - to the control input of the pulse-width signal generating unit.

FIG. I shows a block diagram of the device proposed: in FIG. 2 is a circuit diagram of a code-frequency converter; in fig. 3 - time diagrams that show his work.

A device for reproducing time-varying coefficients contains the first I and second 2 piecewise-linear approximators, filter amplifier 3, first 4, second 5, third 6 counters, code-frequency converter 7, pulse-width-forming unit 8, generator 9 pr pulses, inverter U, unit II control.

A device for reproducing time-variable coefficients operates as follows.

Claims (3)

Three counters 5, 6, and 4 in series recalculate the square-wave pulses from the output of the geyfator 9 The second counter 5 is made and - bit, and the third counter 6 (n + 1) is discharged. The number of bits of the first count 4 is determined depending on the number of approximation segments of a given time function f (t). At the output of the code-frequency converter 7, periodicic groups of pulses are formed with a linear variation with a relative duration from group to group, the duration of each group is equal to the recalculation time of the second n-bit counter 5. To obtain the functional dependence of the relative duration of rectangular pulses triangles (more convenient for piece-line interpolation in comparison with the forked dependence) it is necessary to invert rectangular pulses from the converter output 7 code-hour at time points corresponding to the vertices of the triangles. For this purpose, in the proposed device, the output (n + 1) of the third counter 6 and the block 8 of generation of a pulse-width signal are used, which operates according to a logical expression where N is the code at the output of block 7, M, j, is the code for exit g | bit of the third counter 6, Njj is the code at the output of block 8. The relative duration of rectangular pulses 9 at the output of the pulse width signal shaping unit varies according to a triangular law in time with a period equal to the time of filling n +1 bits of the third account 6. At the output of the inverter U, the relative duration of the rectangular pulses varies according to the law 0mc1 1-9, the NJ code from the output of the th digit of the third counter 6 changes the state of the first counter 4, the code from whose output commutes the transfer coefficients -linear proximeter I and For fulfilling the above condition of linearly varying in time of relative duration 9, it is necessary for the code-frequency 7 converter to work in accordance with the logical expression., X, X, VY,., X, X, X, V ... , ... X, is the code on the bit outputs of the second counter 5; Y is the Y code of the first outputs 1 11 of the third counter 6, with X and yj being the least significant j j „and Y the most significant times; -output signal from the converter code - frequency 7. A variant of the implementation of such a code-frequency converter 7 is shown on the graph. 2. It contains a group of n elements AND and one OR element, with the output of each i -th (T 4 P, where n is the counter width) of the second counter 5, starting from the youngest to the oldest, connecting to the first direct input the i-th element AND group of elements AND, connected by outputs to the inputs of the element OR, the output of each (P- (+7) -th bit (edge + 1th) of the third counter 6 connect to the second direct input of the -th element AND group elements And, and the output of each 1st bit of the second counter is connected to the corresponding inverse input of each of the previous d -t) ele cops and groups of elements I. FIG. Figure 3 shows time diagrams of eight clock cycles of the output voltage and a code-frequency converter circuit diagram for case P.3. From the time diagrams, it is clear that the relative duration of the rectangular pulses 9 increases with each beat (the tact length is equal to the filling time of the second counter 5) linearly, while the frequency of the rectangular pulse data is nepovieHHoft, varying from Gd / 2 to Q / 2, where fg is the frequency of the oscillator 9. In the known device, the frequency of the rectangular pulses is constant n is Gd / 2. It is known that the greatest pulsations during smoothing of the indicated rectangular pulses occur in the case of 9 O, 5. In the proposed device, in the case of 9.O, 5, the frequency of the rectangular pulses is T0 / 2, and in the known 0/2. Obviously a sharp increase in the speed of the device as a whole, since it is possible to use the output amplifier-filter 3 with a significantly shorter time constant. At the output of the amplifier filter 3, the input signal is multiplied by a given time function (t) with a piecewise linear interpolation of the last k that is described and described. The advantages of offering a device to the south compared to the known one are to increase by 2 times the speed of operation (AND-resolution of the second counter 5) - or to increase the accuracy with equal speed. The invention The device for reproducing the time-varying coefficients, containing the first second and third counters, amplifier-filter, the output of which is the output of the device, two piecewise linear annpoKcmviaTOpa, KOMMy tapion inputs of which are connected to the corresponding bit outputs of the first counter, information inputs 1 are the input of the device, and the outputs are connected to the input of the amplifier filter, the inverter, the output of which is connected to the control panel at the input of the first piecelinear aphoximeter, is an oscillator J pulses block forming a pulse width signal, a control block whose output is connected to the control inputs of a square pulse generator and the first, second and third counters, the output of a square pulse generator is connected to the input of the second counter, the output of the older third counter connected to. -. the entrance of the first counter and to the information; At the input of the pulse width forming unit, the higher bit output of the second meter is connected to the third counter input, the output of the pulse width signal shaping unit is connected to the control input of the first piecewise linear approximator to the input of the inverter, characterized in that, in order to increase the speed It contains a frequency code converter, the inputs of which are connected to the bit outputs of the second and third counters, except for the high discharge output of the third counter, and the output to the control input block forming pulse width signal. Sources of information taken into account during the examination I. S. Ginzburg, and Yu. Ya. Lyubarsky. Functional Preferences with Analog-Digital Representation of Information M., Energie, 1973. p. 43-44. 2. USSR author's certificate No. 551662, Kn.GO6Q 7/26, 1977. 3. USSR author's certificate in application number 2514532 / 18-24, cl. QO6Q 7/26, 1977 (prototype). X Xg X,