SU954932A1 - Extremum analyzer - Google Patents

Description

one

The invention is intended for separating and scoring the moments when the input signal reaches critical points (extremum points and inflection points) and can be used for a control device.

It is known a device for extremum counting, comprising a clock pulse generator, a pulse distributor, two analogue comparators, p storage elements, two pulse faces, two multistable elements, an extremum release trigger, four I elements, two BANNER schemes and two. Matching matrices . The device j has an output pressure at which at the moment of changing the sign of the derivative (first gap) pulses are formed, and at the same output there is a pulse corresponding to the minima, and at another output there are pulses 2Q corresponding to the maxima ij.

The disadvantages of the known device are the absence of coral, inflection points and the possibility of false alarms, at these points.

The device closest to the proposed device for fixing the temporal position of the signal maximum contains a successively connected differentiating link, a selector pulse shaper, a selector cascade with two inputs, the second input of which is connected to the input of the differentiating link, the peak detector, the second differentiating link, and. The output driver is intended for fixing the temporal position of the largest amplitude value, coherently in the signal, having several maximaC2.

The disadvantage of this device is that it is not designed to generate pulsed signals at times corresponding to local extremes (different from global ones) and inflection points.

Claims (1)

The purpose of the invention is to expand the scope. 3954 The dug target is reached in that the device containing the differential link, the input of which is. the device input, the first and BTtv time interval selectors, the OR element and the detector of the derivative derivative are entered, the output of the differentiating link is connected to the inputs of the first and second time selectors selectors, the first outputs of which are connected respectively to the first CVG by the second input of the sign detector the second outputs, respectively, with the first and second inputs of the OR element, the output of which is 51 The first output of the device, and the output of the detector of the change in the sign of the derivative, the second output devices. FIG. 1 shows a block diagram of the device ;; FIG. 2 - time diagrams of his work. The extremum analyzer contains a differentiating 3 & 2 I, the first 2 and second 3 time interval selectors, the OR 4 terminal, the detector 5, the change in the sign of the derivative. FIG. 2 a denotes the input signal of the device, b is the output signal of the differentiating link, c is the time intervals allocated by block 2, d is the time intervals allocated by block 3 / d the output signal on the first output of block 2, e is the output signal on the first output block 3, g is the time diagram of changes in the state of the detector for a change in the output voltage, g is the code signal of block 5, and is the output signal of block 4. The extremum analyzer works in a sequential manner. The input signal is differentiated in block 1. From the derivative signal (Fig. 2b) using time selectors 2 and 3, the time intervals corresponding to the positive and negative values of the derivative (Fig. 2c, d) are extracted, and at the first output-d dah blocks 2 and 3, the pulses appear at the time of the beginning of the corresponding time intervals (fig. 2 d, e), and at the second outputs of the blocks 2 and 3 - at the end of the corresponding time intervals. The pulses from the second output block 2 and 3 through the OR element arrive at the first device and signal the critical, points of the input input sys- tem to be analyzed (the extremum points and the exact 24 number of bend). In the initial state, when the signal at the input of the device is absent, block 5 is in one of two stable states (Fig. 2g). When the analyzed electrical signal arrives at the device input, the block 5 is brought to the state in accordance with the expected extremum type by the signals from the first outputs of the blocks 2 or 3, i.e. The expected maximum of the Voltage is preceded by a positive value of the first derivative and the state 1 of block 5, and the expected minimum is a negative value of the first derivative and consisting of O of block 5. If, for example, in the initial position, block 5 is in the state O, and the first one is entered input block has ". ... . positive polarity, then at the first output of block 2 a pulse is formed, which, arriving at the first input of block 5, sets it to the state. Thus, unit 5 pulses from the first outputs of units 2 and 3 sequentially from one state to another (Fig. 2g). When the state of block 5 changes at its output, a signaling impulse appears, which corresponds to the presence of an extra-Q point. Blocks 2,3 and 5 can be implemented in phases, in particular, the detector can change the sign of the derivative with the help of a trigger and differentiating chains, and selectors of time intervals - with the Schmidt trigger and differentiating chains. The claims of the Extremum Analyzer, which contains a differentiating element, whose input is the input of the device, and with the fact that, in order to expand the field of application, the first and second selectors of the ffly interval, the OR element, are introduced into it. and a detector for changing the sign of the product, and the output of the differentiating link is connected to the inputs of the first and second time interval selectors, the first outputs of which are connected respectively to the first and second inputs of the detector changes the Derivative sign, and the second outputs respectively, with the first and second inputs of the OR element, the output of which is the first output of the device, and iif.ixnn of the doctorate of sign reversal, en input the second output of the device. Sources of information, taken into account in the examination. 954 32 1.Avtorsk svvepetp1Vo USSR Aft 375483 / cl. G 01 P 1/12. 1971. 2, Author svioethepstvo USSR N 534O26, CL. N OZ K 5/18, 1975 (prototype).