SU720750A1 - Device for measuring signal against the background of noise - Google Patents

Description

(54) DEVICE FOR MEASURING A SIGNAL ON A BACKGROUND BACKGROUND

one

The invention relates to a measurement technique and can be used to measure signals against interference.

A device for measuring a signal in the background of interference is known, which comprises a pulse generator, a switch and a measuring device 1.

However, the known device has low speed due to the presence of inertial filters.

The aim of the invention is to increase b, 1 action.

To do this, a device for measuring the signal in the background of interference, containing a pulse generator, a first key and a measuring device, has three circuits, each of which is made in the form of serially connected ones: a key and a storage cell, a pulse propelling unit, a pulse distributor, delay lines sequentially connected the first multiplier, the adder and the second multiplier, the output of which is connected to the measuring device, as well as the serially connected shaper of quantization intervals and functional

a converter whose output is connected to another input of the second multiplier, the control input of the pulse generator is connected to the output of the quantization interval generator, and the output is connected to the control input of the first key via the delay line and to the control inputs of additional keys, storage cells and pulse advancement unit through the pulse distributor, the inputs of the pulse advancement unit are connected to the outputs of the storage cells, two outputs are connected to an adder, and the third to the first multiplier, the other input of which By connecting the output of the quantization interval.

The drawing shows a structural electrical circuit of the proposed device.

A device for measuring a signal in the background of interference contains a pulse generator 1, a first switch 2, a measuring instrument 3, additional switches 4-6, connected in series with memory cells 7-9, a pulse advancement unit 10, pulse distributor 11, delay line 12, connected in series the first multiplier 13, the adder 14 and the second multiplier 15, the output of which is connected to the measuring device 3, as well as the sequentially connected driver of the quantization intervals 16 and the functional converter 17, the output to The op is connected to another input of the second multiplier 15. The control input of the pulse generator 1 is connected to the output of the quantization interval 16, and the output to the control input of the first key 2 via the delay line 12 and to the control inputs of the additional keys 4-6, which store the cells 7-9 and the pulse advancement unit 10 through the pulse distributor 11. The inputs of the pulse advancement unit 10 are connected to the outputs of the storage cells 7-9, the two outputs are connected to the adder 14, and the third to the first multiplier 13, the other hcd6d6 is connected To 1nbdu shaper quantization intervals 16. The device operates as follows. Pulses from pulse generator 1, pass through delay line 12, briefly open the first key 2. At the same time, pulse signals are generated from the input signal UBK, the amplitudes of which are proportional to its current instantaneous values. Simultaneously the pulses from the pulse generator 1 are fed to the input of the pulse distributor 11, each of whose three outputs successively, with the arrival of each successive pulse, a high potential is formed IAL, opening one of the additional keys 4-6. Signals proportional to the current instantaneous values are received through the discoveries at each current time point an additional key 4-6 to the corresponding storage cell 7-9. The delay line 12 is shifted by the time required to activate the keys and to reset the previous information in the storage cells 7-9. The previous information in the storage cells 7-9 is reset by the leading edge of the pulse coming from the pulse distributor 11 to the reset input storage cells 7-9. C. The storage cells 7-9 signals, proportional to the memorized values, are fed to the pulse propulsion unit. The signals from the outputs of the pulse propulsion unit 10 are fed to the adder 14, and the third output to the first multiplier 13. From the output of the adder 14, the signal goes to the second multiplier 15 and, from its output, to the measuring device 3C of the output of the output circuit; a; the signal quantization 16, the signals determining the magnitudes of the quantization intervals are fed to the input of the pulse generator 1, the input

Claims (1)

720750 of the first multiplier 13 and through the functional converter 17 - to the input of the second multiplier 15. A useful signal UH is input to the device, which is a DC voltage or low-frequency signal and superimposes some interference on it, which generally has some amplitude A, frequency w and phase UBK. UH + A sin (at-f j). Choosing three ordinates that are arbitrarily close to each other (three counts) corresponding to instantaneous values within the period of interference at the instants of time ti, tifta, we obtain the system of equations Ui X UH + Asin (wti + c U2 UH-f Asin ((at24- and 3 UH -f A sin (ojtj -f-Ф, with which you can find the desired value of the useful signal. Solving this system of equations, we get J TI Ui.-2U2.co54e403 - jrPcosTig) 4- cosec2 -1 (Ui-2U2COS Av + Ua), where Л0 is the value that determines the magnitude of the quantization intervals. The pulse generator 1 outputs pulses with a frequency much higher than the interference frequency. and pulses 10 provide a continuous sequence of pulses for analyzing the input signal curve. At any time, the outputs of this block will be Ui — the first count for the given moment, n – 2 count, and Us — the third count. In multiplier 13, the signal value and g are multiplied by 2 cos L 0. In the adder 14, the values of the signals Ui, Us and the signal from the output of the multiplier 13 are summed, and in the second multiplier 15 the signal from the output of the adder 14 is multiplied by the TT-WeT signal obtained from the output of the functional Ate 17. At the output of the multiplier 15 there is a signal UH, free from interference. This signal is measured by a measuring device 3. Formula of the invention A device for measuring a signal against an interference background, comprising a pulse generator, a first key and a measuring device, characterized in that, in order to improve speed, three circuits are inserted, each of which is made in the form of Additional key and memory cell connected in series, pulse advancing unit, pulse distributor, delay line, first multiplier connected in series, adder and the second multiplier, the output of which is connected to the measuring device, as well as serially connected shaper of quantization intervals and functional converter, the output of which is connected to another input of the second multiplier, while the control input of the pulse generator is connected to the output of the generator of quantization intervals, and the output to the control the first key input through the delay line and to the control inputs additional 5 1x. the storage cells and the pulse advancement unit through the pulse distributor, the inputs of the pulse advancement unit are connected to the outputs of the storage cells, two outputs are connected to an adder, and the third to the first multiplier, the other of which is connected to the quantization interval generator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 476694, cl. H 04 B 15/00, 1973 (prototype).