SU1385279A1 - Device for holding signal amplitude changes - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automatic control systems as well as in analog computing systems. The invention improves the accuracy of temporary fixation of amplitude changes of the signal due to fixation in. the time of the normalized adjustable differences in the amplitude of the monitored signal and the exclusion of its dependence on the frequency of following differences. For this, an adjustable voltage source 6 and a second sampling and storage element 5 are additionally introduced into the device. In addition, the device contains a comparator 1, a shaper 2 reset pulses, the first element 3 of sampling and storage, a full-wave rectifier 4. When a nonstationary signal is fed to the device, short-term pulses are formed at certain points in time, fixing the time moments of the drops input voltage In this case, all changes of the monitored signal, equal in absolute value to the selected level, will be recorded in time. 2 Il. (L

Description

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The invention relates to a pulse technique and can be used in automatic control systems, as well as in analog computing systems.

The aim of the invention is to improve the accuracy due to the fixation in time of the normalized adjustable differences in the amplitude of the monitored signal and the elimination of its dependence on the frequency of following the differences,

FIG. Figure 1 shows the block diagram of the device for temporarily fixing the amplitude changes of the signal in FIG. 2, time diagrams explaining the operation of the device.

The device for capturing amplitude changes of the signal contains a comparator 1, the output of which is connected to the input of the former 2 reset pulses (FIS), the first output of which is connected to the reset input of the first sample and storage element 3, the analog input of which is the device input, and the output connected to the first the input of a differential, two-wavelength rectifier (DDV) 4, the second input of which is connected to the output of the second element 5 of sampling and storage, the analog input of which is connected to the analog input of the first element 3 ki and snore, and the reset input - to the second output of the former 2 reset pulses, adjustable source 6 of the reference voltage (RION), the output of which is connected to one of the inputs of the comparator 1, to another input of which the output of the differential two-period rectifier 4, in this case, the output of the comparator 1 is the output of the device.

The device works as follows.

Suppose that a monitored signal, for example, U g, is supplied to the input of the device (FIG. 2). At any moment of time one of the 3.5 elements of sampling and storage (VHF) finds with in the storage mode, and the other in the sampling mode, i.e. one of the inputs of the DDV 4 voltage is fixed

but, and on the other there is a varying voltage of the input monitored signal. The rectified differential difference of these voltages at the output of the DDV 4 varies by

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the magnitude according to the input signal change When the voltage from the DCV 4 output reaches the threshold level uU set to RION 6, the comparator 1 is triggered. On the front of the output voltage jump of the FIS 2, performed, for example, as a T-trigger, two output buses , changes the operation mode of both UBH 3.5 from the sampling mode to the storage mode and vice versa. As a result, the UHF operating in the sampling mode switches to the storage mode and the UHT operating in the storage mode to the sampling mode. Immediately after switching, the difference of the input voltages on CV 4 becomes zero output voltage DDI 4 also becomes zero comparator 1 is returned to its original state. Thus, the output generates a very short pulse reflecting the time when the input monitored signal has changed in amplitude by a value specified by RION 6 relative to the voltage level recorded in the previous cycle. With a further change in the input signal, the process described is repeated. Thus, when a nonstationary signal is output to the input of the device at times t U g (, (x Short-time pulses are formed, fixing the time moments of the input voltage drops relative to the previous level, the absolute value of which is normalized (specified) and adjustable Therefore, all changes of the monitored signal, equal in absolute value to the selected level, are fixed in time. In view of the absence of inertial integrating circuits in the proposed device, the accuracy of fixing the norms Rowan fluctuations does not depend on the frequency of their following.

Claims (1)

Invention Formula A device for temporarily fixing amplitude changes in the signal, containing a rectifier, a comparator whose output is the output of the device and is connected to the input of the reset pulse shaper, the first output of which is connected to the reset input of the first element of the sample and storage, the analog input of which is device, characterized in that, in order to increase accuracy by fixing in time the normalized adjustable differences in the amplitude of the monitored signal and eliminate its dependence on the frequency changes, it introduced adjustment reference voltage source and a second sampling and storage element, an analog input connected to the analog input of the first element sampling and storage, reset input. - to the BTopoNiy output of the reset pulse driver, and the output to the first input of the rectifier, made in the form of a differential two-wave rectifier, to the second input of which the output of the first sample and storage element is connected, and the output of the differential half-field - a period of the current mitel is connected to the first input of the comparator, to the second input of which the output of an adjustable voltage source is connected. FIG. 2