SU959268A2 - Controllable filter - Google Patents

Description

(54) MANAGED FILTER

... - 1 - The invention relates to radio engineering. And can be used to isolate useful low frequency components of measured vector signals. According to the main author. St. No. 884082 is known a controlled filter comprising a series-connected first comparison unit, a limiter, a first integrator, the output of which is connected to another input of the first comparison unit, a series-connected sign detector, a second comparison unit, a second integrator and a quad, with the input of the sign detector connected to the output of the first comparison unit, the output of the second integrator is connected to the second input of the second comparison unit, the output of the quadrator is connected to the auxiliary input of the limiter through the series data of the first large-scale amplifier and the first cyw matrix and to the auxiliary input through the third large-scale amplifier and the second adder, successively connected to each other, with another input from the adders connected to the source of a constant vein pinin signal. The disadvantage of this filter is the low accuracy of the selection of the components of the multidimensional signal due to the fact that their joint changes are not taken into account. invention - improving the accuracy of the selection components of the multidimensional signal. To achieve this goal, a successively connected additional comparator unit, an additional limiter and an additional integrator whose output is connected to another input of the comparator unit, the first additional scale amplifier and the first additional adder connected between the quad output and the control input are introduced into the known controlled filter. additionally of a limited reading range, a second additional large-scale amplifier and a second additional an adder connected between the output of the quad and the control input of the additional integrator, serially connected first delay lines, the first multiplier, the third additional adder and the third additional scale amplifier connected between the output of the sign detector and the input of the second comparison unit, sequentially connected an additional sign detector, the second line is zadep) ykv1 and the second multiplier, connected between the output of the additional comparison unit and the other input of the third additional adder, p and the second input of the first multiplier is connected to the output of the sign detector, a second input of the second multiplier - to the output of the additional comparator block, and the second inputs of the first and second additional signals of adders filed constant value. The drawing shows a structural electrical circuit of a controlled filter for two input signals. A filter is constructed in the same way for more signals. The controlled filter contains blocks T and 2 comparisons; limiters 3 and, integrators 5 and 6, detectors 7 and 8 characters, delay lines 9 and 10, multipliers 11 and 12, adder 13 scale amplifier 1, comparison block 15, integrator 16, quad 17 scale amplifiers 18, 19 20 and 21, adders 22, 23, 2k and 25. In the drawing marked y. (t), Ul) the measured values of the first and second signal at time t; (t), 7- (t) - useful components of the first ft ° T and second signals; pjf, Pf - T - signals of constant size. The controlled filter operates as follows. The first input signal y (t) is fed to the input of comparison unit 1, where the first output signal 7y. (T) of the filter is subtracted from it, and the difference e (t) is obtained to the input of limiter 3 and sign detector 7. If) exceeds the value of the limiting voltage / 5 (t) of the limiter 3, then the signal g, (t) is limited to the value), which can be represented by the expression:. () at) 7/0. (t) 8.t) at-p, (1} f (t) (t) (-p / t) at g (t)., (t) where (t) - output signal of the limiter 3. Limiter 3 can be implemented, for example, using an operational amplifier in the saturation mode, Sig “Nal, (t) from the output of limiter 3 is fed to the input of the integrator 5, made, for example, using an operational amplifier with capacitive response meaningful feedback. At the output of the integrator 5, the component (t) of the first signal, Kotor, is obtained and is fed to the first input of the filter. The second input signal 7, (1) is supplied to the input of the comparator unit 2 and using this block, the limiter k and the integrator 6 is transformed in the same way as the first input signal. As a result, the output component of the integrator 6 is y2 (t ) the second signal, which is fed to the second output of the filter. The remaining blocks of the controlled filter are intended for the interconnected adaptation of the values of the limiting voltage of the limiters and the constant integration integrator time 5 and 6. The signal coming from the output of the comparison unit 1 to the input of the 7 sign detector (t) is converted according to the law (+1 ij (t) sing e (t) for & (1) 0; where € (t) is the output signal of the sign detector and is fed to delay line 9, where it is stored for an TG time interval selected experimentally. From the output of delay line 9 the signal g, f (t-T) goes to one of the outputs y the knife 11, to another input of which a signal is output from the detector output of 7 characters, From the output of multiplier 11, a signal Of (t) is received on the value of sign autocorrelation of deviations) and f (t-T), i.e. ) - sing | f (.

From the output of the multiplier 1 1, the signal g (t) is fed to one of the inputs of the adder 13. A signal l (1) is sent to the other input of the adder 13 about the sign autocorrelation of the deviations 2. (t) and i (tC), obtained similarly to the g ( t) using a detector 8, delay line 10 and multiplier 12.

The signal of the sum obtained from the output of the adder 13 is fed to the input of the scale amplifier 1t, where it is multiplied by a constant factor 1/2 (by a constant factor 1 / n with the number of input signals n), the signal "/ (t) goes from the output of the scale amplifier to the first input of the comparator unit 15, in which the output signal of the integrator 16 is subtracted from it, and the resulting difference is fed to the input of the same integrator. Thereby, at the output of the integrator 16, a smoothed signal from the scale amplifier 14 is obtained. From the output of the integrator 16, the signal through the quad 17, in which it is squared, is fed to the inputs of the scale amplifiers 18, 19, 20 and 21, where the signal is multiplied by a constant These coefficients k, kk, k. The output signal of the scale amplifier 18 is summed in the adder 22 with a constant signal |% and is fed to the control input of the limiter 3 with the value of the limiting voltage i (t).

The output signal of the scale amplifier 19 is summed in the adder 23 with a constant signal T ° and is fed to the control input of the integrator 5, specifying the value of the constant integration time T (t) of this integrator.

Similarly, the values of the limiting voltage of the limiter and the constant integration time of the integrator 6 are set.

The time constant of the integration, the integrator 16, the scale factors kj, k, k, k of the scale amplifiers, the constant signals, d and i are determined experimentally depending on the properties, the desired signal and interference.

Thus, the settings A (t) and T. | (t) are adapted depending on the deviations of the useful component of the first signal y (t) from its measured value, and on the deviations of the useful component of the second signal y (t) oT of its measured values. The settings and T2, (t) are adapted similarly.

This allows for interrelated measurements of the values of the first and second signals to more quickly reduce the filter settings, which improves the accuracy of the selection of useful components of the multidimensional signal. Thus, the application of the proposed controlled filter in the allocation of useful components of the interrelated variable content of sulfur and silicon in the blast furnace instead of two separate controlled filters reduces the average modular deviation of the useful components from their actual values.

Claims (1)

Invention Formula Controlled filter by author. St. No. 884082, characterized in that, in order to improve the accuracy of the selection of the components of the multidimensional signal, a further comparison unit, an additional limiter and an additional integrator, the output of which is connected to another input of the comparison unit, serially connected to the first additional scale amplifier and first additional adder, connected between the output of the quad and the control input of the additional limiter, connected in series the second additional the first scale amplifier and the second additional adder connected between the quad output. and an additional integrator control input. The first delay lines, the first multiplier, the third additional adder and the third additional scale amplifier connected between the output of the sign detector and the input of the second comparison unit, the additional detector of the second sign sequentially connected, the second delay line and the second multiplier connected between the output of the additional comparison block and another input the third additional adder, while the second input of the first multiplier is connected to the output of the detector.ra sign, the second input of the second mind ozhitel - to vyho7959268. eight do additional block comparison, Sources of information, and the second inputs of the first and second taken into account in the examination of additional adders were given the signals of a constant value of the USSR author's certificate, .№, 884082, cl. H 03 H 21/00, 1981.