SU1241419A1 - Smoothing device - Google Patents

Abstract

The invention relates to radio engineering. Noise immunity increases. The device contains two comparators 1.4, limiter 2, two integrators 3, 5, amplifier 6, inverter 7, adder 8, key 9, null organ 10. The introduction of the zero organ 10 and key 9 increases the noise immunity counting a change in the smoothing time constant by disconnecting the input signal from the smoothing device at the time of the occurrence of random impulse noise of large amplitude. 1 il. Wftrl-I J. 1-II-I X pF9 (L С 4 1 WITH Jnop

Description

The invention relates to radio engineering and can be used in devices for extracting a signal from interference.

The aim of the invention is improving noise immunity.

The drawing shows the electric circuit of the proposed smoothing device.

The smoothing device contains, the first comparison element 1, the limiter 2, the first integrator 3, the second comparison element 4, the second integrator 5, the amplifier 6, the inverter 7, the adder 8, the key 9, the zero-body 10,

Smoothing device works as follows.

The summing input of the first element I of the comparison, through the open key 9, is supplied with a signal from the input of the smoothing device, to the subtractive input — the signal from the output of the integrator 3. The key 9 can be implemented, for example, to a relay. The error signal. From the output of the reference element 1 is fed to the input of the limiter 2, where it is limited to the permissible value. Limiter 2 can be implemented, for example, on an operational amplifier in saturation mode. The signal from the output of the limiter 2 is fed to the input of the integrator 3, implemented, for example, on an operational amplifier, with a capacitive negative feedback. Thus, we have a periodic link of the first order with a constant smoothing time T, implemented on a comparing ring element 1, a limiter 2 and an integrator 3. The smoothed signal from the output of the integrator 3 is fed to the input of the second aperiodic link Comparison of the integrator 5 and the input of the amplifier 6. From the output of the integrator 5, the signal goes to the input of the inverter 7. In the adder 8, the signals from the output of the inverter 7 and amplifier 6 are summed The aperture 8 forms a smoothed signal arriving at the output of the device. The signal at the output of the second reference element 4 is proportional to the estimated speed of the smoothed signal. However, with an increase in the duration and amplitude of random noise, the accuracy of signal extraction from

 VNIIPI Order 3611/53

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interference, since the rate of change of the smoothed signal increases during the course of the comparison element 4 at a given smoothing time constant

5 T of the integrator 3. In this connection, the signal from the output of the comparison element 4 is fed to the input of the null organ 10, where it is collapsed: the maximum zero value of the change rate of the useful signal U, pp and if the value is exceeded key 9. The amplitude of the signal at the output of the integrator 3 is also reduced when the magnitude of the signal is from

The I output of the comparison element 4 is less than U (, the op-zero op 10 is reset, and the key is opened; 9, The input from the first comparison element 1 again receives a signal from the input, smoothing the device

20 wa.

Thus, the introduction of the null body 10 and the key 9 allows increasing the noise immunity of the device by changing the time constant of the smoothing.

- vanishing T by disconnecting the input signal from the smoothing device at the time of the occurrence of random impulse noise of large amplitude,

30 f o rm a l l invention

The glide device contains a series-connected first comparison element, a stop,

tj-j is the first integrator, the second element of the comparison, the second integrator, the output of which through the inverter is directly connected to the first input of the adder and to the second input of the element

4 (3 comparisons, respectively, and the output of the first integrator through an amplifier and directly connected to the second input of the adder and to the first input of the first comparison element, respectively

4: 5 CTBBKHOj, while the output of the adder is the output of a smoothing device, characterized by 4TDs in order to improve the noise immunity, a null organ and

50 key, where the key input is the input of the smoothing device, and the key output is connected to the second input of the first comparison element, the output of the second comparison element is connected

55 to the input of the zero-organ, the output of which is connected to the control input of the key

. Circulation 816 Subscription

Claims (1)

30 claims A smoothing device containing a series-connected first comparison element, a limiter, φ; the first integrator, the second comparison element, the second integrator, the output of which is through the inverter and directly connected to the first input of the adder and to the second input of the comparison element 40, respectively, and the output of the first integrator through the amplifier is directly connected to the second input of the adder and to the first input of the first comparison element 45 S THE input smoothing device and key output is connected to the second input of the first comparison element, the second comparison element output is connected. • 55 to the input of the zero-organ, the output of which is connected to the control input of the key. 'VNIIIPI Order 3611/53 Circulation 816 ____ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4