SU849453A1 - Signal discriminating device - Google Patents

Description

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The invention relates to automation systems, namely, devices for processing and cueing analog signals.

A signal ejection device is known that contains an integrator associated with a sampling and fixing scheme (1}.

The drawback of the device is the impossibility of separating the signal with a significant fluctuation of its level, besides, more efficient gating prevents the presence of information about the position of the signal in a controlled interval, which prevents the system from being used in the search mode.

It is also known to have a device that connects a series-connected amplifier with an adjustable amplifier, a quantizer, and a comparing device 2. A disadvantage of this device is that it cannot isolate the opposite signal with significant fluctuations in the HH5UC of its constant component.

The closest technical solution to the proposed one is a signal isolation device, which has identical circuits containing sequentially connected multiplication elements, integrators and quantizers. Both circuits are connected to the adder Z.

The disadvantage of this device is the impossibility of its operation with large changes in the signal level and constant, which is necessary for the operation of the automation device of the technological process.

The purpose of the invention is to expand the dynamic range of the device.

This goal is achieved by the fact that the signal evictions device containing

15 and two quaters, connected with two integrators, an adder and a multiplication element, an additional sum is introduced. the matator and the subtractive element, and you move the multiplication element connected to

the input of the adder, the output of which is connected to the inputs of the quantizers, and an additional .cumulator and a subtractive element are each connected with their own inputs to

to the integrators' moves, the output of the additional adder of the switch to the input of the multiplication element, the output of the subtractive element is connected to the second input of the adder.

FIG. I shows the block diagram of the device on phage, 2 - diagram of stresses.

The device contains a multiplication element I, an adder 2, quantizers 3 and 4, integrators 5 and b, a subtractive element 7 and an additional adder 8, the output of multiplication element 1 being connected to the input of Adder 2, to the output of which through quantizers 3 and 4 are connected integrators 5 and 6, the additional adder 8 and the subtracting element 7 are each connected by their inputs to the outputs of the integrators 5 and 6, the output of the additional adder 8 is connected to the input of the multiplication unit 1, the output of the subtracting element 7 is connected to the second input of the adder 2. By position 9 cue selectable signal | 10 - change of the signal depending on the voltage from the output of the additional adder; 11 - change of the constant component depending on the voltage from the output of the subtraction (thawing elomont 7; 12 and 13 - the levels of the thresholds of the quantizers 3 and 4; 14 and 15 - signals at the outputs of the quantizers 3 and 4.

The device works as follows.

The extracted signal 9, the passage through the multiplication element 1, undergoes a change of 10 amplitudes depending on the voltage from the output of the additional adder 8. When signal 9 passes through the adder 2, the signal changes its constant component 11 depending on the voltage the output of the subtracting element 7. After this, signal 9 is quantized by two levels 12 and 13 by quantizers 3 and 4, converted into signals 14 and 15. On entering integrators 5 and 6, signals 14 and 15 are converted into slowly varying voltages, which at a constant period of following and the amplitude of the signals depend only on the duration of the signals 14 and 1, respectively. With equal durations of the signals 14 and 15, the voltage at the output of the integrators 5 and 6 no longer changes and the signal 9 does not change its constant component 11.

In turn, the sum of the stresses is in accordance with the total d / i signal

14 and 15, and, acting on the multiplication element I, changes the amplitude of the signal, adjusting the total duration of the signals 14 and 15 to the required one. Similarly, the voltage from the output of the subtracting element 7 changes the constant component 11 relative to the levels 12 and 13 of the response thresholds of the quantizers 3 and 4 so that the difference in the durations of the signals 14 and 15 decreases.

Thus, the proposed device from a two-polar separable signal 9 generates signals 14 and 15 of a predetermined duration corresponding to the position of the vertices of the signal 9, regardless of the amplitude and level of the constant component of the processed signal 9.

The use of this signal extraction device makes it possible to create a relatively simple scheme for extracting a secondary emission pulse during electron beam welding. The circuit forms the output pulse when the amplitude of the input pulse changes by 20 dB. In addition, due to the adjustment of the constant component of the device, the extraction device turned out to be low to sinusoidal pickups at a frequency of 5.0 Hz, with the selected decomposition parameters turned out to be low. frequency.

Claims (2)

1. US patent M 3636458, NCI 328-151, 1972. 2. US patent M 3683376, NCI 34O-347LV, 1972. Z.Svistov V.M. Radar signals and their processing. M., Soviet Radio, 1977, p. 194. U FIG .. FIG. 2