SU907467A2 - Pulse peak distortion meter - Google Patents

Description

The invention relates to communication technology and can be used to estimate the distortion of electrical signals, in particular, to adjust the amplitude-private characteristic (AFC) of four-port networks.

According to the main auth. No. 434336 is well known for a pulse tip distortion meter that contains an input signal scaler and a series-connected restoration unit of a constant component, detector, and a junction ratio meter. The second input of which is connected to the input of the input signal scale converter, the control circuit, the output of which is connected to the second input of the DC-block recovery unit}.

However, the well-known pulse top distortion meter does not provide measurements when tuning the amplitude-frequency characteristic of the quadrupole, and also has a low measurement accuracy.

The purpose of the invention is to provide measurements at. setting the amplitude frequency response of the quadrupole, as well as improving the accuracy of measurements.

The goal is achieved by inserting a key, an indicator, an additional Detector, a start signal generator and a Reset signal Normalizer into a known pulse top distortion meter, and the input of the first constant-restoration unit is connected to the converter output.

10 scale of the input signal through the key, the second input of which is connected to the input of the indicator and to the output of the control circuit, the input of which is also another input of the voltage measuring instrument

15 are connected, respectively, through the start signal generator and through an additional detector, the input of which through the reset signal generator is connected to the auxiliary input of the control wiring.

Moreover, the input of the control circuit is connected to the output of the trigger generator through the frequency gradient sign detection unit, the second input

25 which is connected to the output of the reset signal generator.

In addition, the frequency gradient sign determining unit is made in the form of serially connected dividers of two liters, an OR element, a second additional detector, an integrator and a switch, the second and third inputs of which are connected to the output of the splitter by two and with the combined first inputs of the splitter by two and trigger ,, The second input and output of which are connected respectively to the second inputs of the divider into two and the element OR.

FIG. 1 shows the structural electrical circuit of the proposed meter; in fig. 2 shows an embodiment of a frequency gradient sign detection unit.

Pulse tip distortion meter contains indicator 1, control circuit 2, detector 3, additional detector 4, input signal scale converter 5, DC component recovery unit 6, voltage ratio meter 7, trigger signal driver 8, reset signal driver 9, key 10, a frequency gradient sign determining unit 11, consisting of FIG. 2) integrator 12, second additional detector 13, element OR 14, divider 15 into two, switch 16 and trigger 17. In addition, the device contains the 1st setting quadrupole 18 and oscillating frequency generator 19.

The meter works as follows.

Each driver 8 and 9 contains a frequency-dependent node (not shown) tuned to a frequency. Respectively, the beginning and end of the range to be tuned.

The signals from the outputs of the drivers 8 and 9 are fed to the input of the control circuit 2. The impulse from the imaging unit 8 transfers the circuit 2 to a single one, and the impulse from the imaging device 9 to the zero state.

Thus, if the frequency at the input of the meter lies within the range to be tuned, the output of the control circuit 2 is a signal of a logical unit.

Additional detector 4 converts the signal, varying in frequency and amplitude, into a DC signal of a pulsed form with distortions of the pulse apex, and these distortions reflect the amplitude-frequency characteristic (AFC) of the tuned quadrupole.

In the input signal scale converter 5, the pulses are increased to the value necessary for further processing. This signal is applied to the key 10. The voltage at its output depends on the control signal. If the frequency of the input signal is outside the tuning range, then the voltage at the output of the key 10 is zero, if the frequency of the input signal is in the setting range, then the voltage at the output of the key 10 carries information about the frequency response of the tunable quadrupole.

This signal is a rectangular pulse with a non-uniform tip. The magnitude of the non-uniformity of the pulse reflects the non-uniformity of the frequency response. The DC recovery unit 6 eliminates the imbalance caused by the pulsed form of voltage, without affecting the non-uniformity caused by the uniformity of the frequency response.

The operation of block 6, like the operation of key 10, is controlled by a control signal. Next, the constant component of the signal is filtered out, and the signal itself is fed to detector 3 and the meter 7. The larger non-uniformity of the frequency response corresponds to the large readings of the meter 7, to the smaller ones - the smaller one.

Oscillating frequency generators, such as type X1-38, can have frequencies mirrored about zero frequency in their frequency spectrum; therefore, a signal can be seen at the output of the driver 8 twice during the sweep period.

In this case, the control circuit 2 switches to one state with the arrival of the first pulse from the imaging unit 8, corresponding to the frequency of the beginning of the tuning range, which is mirrored relative to the zero frequency. As a result, the setting will be incorrect. The accuracy of the tuning is achieved by switching on between the driver 8 and the circuit 2 of the control unit 11 for determining the sign of the frequency gradient, the second input of which is also connected to the output of the driver 9.

If frequencies mirrored relative to the zero frequency arrive at the input of the meter, then the start of the control circuit 2 occurs with every second pulse removed from the driver 8.

If frequencies that are mirrored relative to the zero frequency do not arrive at the meter input, then control circuit 2 is started by each pulse removed from the generator 8. Circuit 2 is set to the zero state by a signal from the generator 9 output. Technical implementation of the gradient sign determining unit 11 frequencies may be different.

The first input of the block 11, connected to the output of the driver 8, is the counting input of the divider 15 for two, combined with the first input of the switch 16 and the installation input into the unit state of the trigger 17.

The second input of the unit 11, connected to the output of the imaging unit 9, is the installation input into the zero state of the divider 15, combined with the installation input into the zero state of the trigger 17.

The output of the divider 15 is simultaneously connected to the second input of the switch 16 and the first input of the element OR 14, the second input of which is connected to: the output of the trigger 17, and the output is connected in series with the second additional detector 13, the integrator 12 and the control input of the switch 16, the output of which is the output of block 11.

The operation of block 1 is based on a comparison of the pulses produced by the divider 15 by two and the trigger 17.

If the spectrum of the signal at the input of the measuring device does not contain frequencies that are mirrored relative to the zero frequency, t during the sweep period of the generator 19 at the output of the imaging unit 8 and the output of the imaging instrument 9 is output in a single pulse.

Following the impulse from the output of the imaging unit 9, which translates the divider 15 and the trigger 17 into the zero state, a pulse comes from the output of the imaging generator 9, which translates the divider 15 and the trigger 17 into the zero state. The signal from the output of the driver 9 again brings the divider 15 and the trigger 17 to the zero state. Thus, switching occurs every sweep period of the generator 19. The voltage at the outputs of the divider 15 and the trigger 17 repeats each other, so the voltage at the output of the OR 14 element is zero, and therefore, it is also zero at the output of the second additional detector 13 integrator 12 and the control input of the switch 16, i.e. the input of unit 1 is connected to its output via switch 16.

In the case of the presence in the spectrum of frequencies arriving at the input of the meter mirrored relative to zero frequency, during the sweep period of the generator 19, at the output of the imaging unit 8, there are two pulses in the vehicle. The first pulse from the output of the imaging unit 8 converts the divisor 15 and the trigger 17 into a single state.

At the output of the OR 14 element, the voltage is zero before the second pulse arrives from the output of the imaging unit 8, which transfers the divider 15 to the zero state, and the state of the trigger 17 does not change. At the output of the OR 14 element, there is a potential of a logical unit. With the arrival of a pulse from the output of the former 9, the trigger 17 goes to the zero state, and the state of the divider 15 does not change. At the output of element OR 14, there is again zero potential.

Thus, at the output of the OR element 14. there is a square-shaped signal, the presence of which indicates the presence at the input of the frequency meter, which is mirrored by OTHq at a relatively zero frequency. Further, this signal is detected, integrated and fed to the control input of the switch 16, which connects the output of the divider 15 to two to the output of the block 11. The integration constant should

0 to be sufficient so that the voltage at the control input of the switch 16 does not fall to the value that transfers the switch 16 to another state corresponding to the absence of the input

5 frequency meter, mirrored relative to the zero frequency.

Indicator 1 signals the presence in the spectrum of frequencies arriving at the input of the meter and the necessary} {

0 for setting, and also indicating that the signal is sufficient for normal operation.

Thus, the process is simplified.

5 system settings, tuning accuracy increases, the time spent on tuning decreases, the requirements for qualifications of operators making adjustments sharply decrease, process reliability increases

0 settings.

Claims (3)

1. The impulse meter distortion meter according to the author. St. No. 434336, characterized in that, in order to provide measurements when adjusting the amplitude-frequency characteristic of the four-port network, a key, an indicator, an additional detector, a trigger signal generator and a reset signal generator are input, and the first input of the constant-restoration unit is 5 is connected to the output of the input signal scale converter via a key, the second input of which is connected to the indicator input and to the control circuit input, the input of which and the other input of the voltage ratio meter are respectively connected via a trigger driver and an additional detector, which input through the driver 5, a reset signal is connected to the auxiliary input of the control circuit. 2. The device according to claim 1, characterized in that, in order to improve the measurement accuracy, the input The control circuit 0 is connected to the output of the start signal generator via a frequency gradient sign determining unit, the second input of which is connected to the output of the reset signal generator. five 3. The device according to claim 2, characterized in that the frequency gradient sign determining unit is designed as a series-connected divider into two, an OR element, a second optional detector, an integrator and a switch, the second and third inputs of which are connected respectively to the output of the divider by two and with the combined first inputs of the divider into two and the trigger, the second input and output of which are connected respectively to the second inputs of the divider into two and the element OR. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 434336, cl. G 01 R 29/02, 1971 (prototype)