SU1320773A1 - Device for measuring modulation depth - Google Patents

Abstract

The invention can be used in radio systems and automatic control systems with amplitude modulated effects to measure the modulation depth ratio. The purpose of the invention is to reduce the measurement time as a result of the introduction of an automatic functional relationship between the quantizer level of the limiter former, depending on the number of the quantization step of the counter c digital indication The device contains an adjustable voltage divider 1, a normalization unit 2, a key 3, a synchronizer 4 impulses, limiter driver 5, & LOC 6 logical analysis, summing counter 7, counter 8 with digital indication, made in the form of register 9 of indication connected to counter 10, functional divider voltage 11, read-only memory 12, digital-to-analog converter 13, output terminal 14. The measurement process in the device is fully automated. 1 hp f-ly, 1 ill. i (L

Description

The invention relates to a measurement technique and can be used in radio engineering systems and automatic control systems with amplitude modulated effects for measuring the modulation depth factor.

The purpose of the invention is to reduce the measurement time by introducing an automatic functional connection between the quantization level of the limiter - driver depending on the number of the quantization step of the counter with digital indication.

counters 7 and 10 are set to the zero state. At the same time, from the output of the digital-to-analog converter 13 to the second input of the limiter-driver 5, the maximum value of the calibrated voltage Yc ;, is selected, which is selected from the conditions and / or ixn. the amplitude-modulated signal loses its signal to the first input of the limiter — shaper 5, which generates pulses at the instants when the signal exceeds the set calibrated level. At the same time, the amplitude-modular drawing shows a structured 15 signal from the output of the key 3, the circuit of the proposed device. enters the input of the imager 4 sync pulses, which generates sync pulses, following with a frequency equal to the carrier frequency of the input signal 20. Sync pulses are supplied to the power unit. It contains a controllable voltage divider 1, the control input of which is connected to the control input through the rating block 2.

the key 3, the output connected to the input input, and the output pulses of the bounds of the generator 4 sync pulsesformer 5 - on the second

and limiter-former 5, block input unit 6 logical analysis. Im6 logical analysis, the output of the connect-pulses at the output of block 6 logical

Valid with the control inputs of the analysis sum-25 are formed in the case of a missing meter 7 and counter 8 pulses from the output of the limiter

digital display performed in. Former 5. Otherwise

the form of the register 9 of the display, the input co-pulses at the output of the block 6 not connected to the input of the counter 10, pound-yut. At each calibrated level

The national voltage divider 11, 30 by the counter 7, counts the number exceeded in the form of successive increases in the input signal of this connected constant memory level. In this schag

the device 12 and the digital-to-analog pre-quantization of calibrated levels of the imager 13, and the input terminal is changed according to the law

14 devices.

  . / and /

The device works as follows.

The amplitude-modulated signal through the input terminal 14 of the device is fed to the input of the controlled divider 1. The voltage from the output of the controlled divider 1 is fed to the input of the normalization unit 2, which compares the amplitude value of the signal

and

the maximum amplitude Uj, g of the amplitude-modulated signal. If and „and„ „,„ or or „.n. then the normalization block2 generates a signal for the reorganization of the controlled divider 1 in the direction of decreasing or increasing the division factor, respectively.

..J.N (+

CD

where h is the quantization step;

U. the maximum value of amLLO1 K L

40-modulated

signal;

TV is the price of a single quantizing clock;

N is the number of quantization steps

with the selected (normalized) value of 5 (C N, where is the coefficient 50

modulation agent

If the number of pulses arriving at the input of counter 7 is less than

with n,

where p is the capacity of the counter 7;

CJ circular carrier frequency;

As soon as Uj is equal to U,

 the signal at the first output of block 2, the normi-GG, is the circular frequency of the envelope; the vanishing is not formed and the reorganization of the whole pulse from the output of the block 6, the installer 1 stops. At the same time, the counter 7 is switched to the zero state,

the output of the block 2 ration post-simultaneously. At the same time, this impulse comes

It sends the enable signal to the control control input of the counter 10, the output of the key 3. After switching on the device, its state. Output code

207732

counters 7 and 10 are set to the zero state. At the same time, from the output of the digital-to-analog converter 13 to the second input of the limiter-driver 5, the maximum value of the calibrated voltage Yc ;, is selected, which is selected from the conditions and / or ixn. the amplitude-modulated signal loses its signal to the first input of the limiter — shaper 5, which generates pulses at the instants when the signal exceeds the set calibrated level. Simultaneously amplitude-mode „

/ and /

  ..J (+

CD

h is the quantization step;

U. the maximum value of amLLO1 K L

volume modulation

signal;

TV is the price of a single quantizing clock;

N is the number of quantization steps

50

modulation agent

If the number of pulses arriving at the input of counter 7 is less than

with n,

where p is the capacity of the counter 7;

CJ circular carrier frequency;

the counter 10 is fed to the address inputs of the persistent storage device 12. The information previously stored in the persistent storage device 12 is retrieved from a cell whose address is determined

That is by the counter 10 modulation factor.

Claims (2)

1. A device for measuring the depth of modulation, containing a controlled voltage divider, the input of which is the input of the device, and the output is an appropriate level of a capillary / controlled voltage divider, the voltage of which is connected in series to the control the input of the limiter-former of the limiter-former and the sum- 5. At the same time, the dependence of the output code of the permanent storage device 12 on the address code, i.e. from the state of counter 10, must be The counter is connected to the input of the counter with digital indication, the output t5 of the key is connected to the control input of the summing counter through the serially connected driver of clock pulses and the logic analysis unit, the output of the limiter actuator is connected to the second input of the logical analysis unit, the output of the controlled voltage divider is connected to the control input of the block is normalized so that the quantization step of the calibration levels at the output of the digital-to-analog converter 13 is changed 20 by law (1). After arrival of the limiter-maker 5 of the next calibrated level, the internal measurement cycle is repeated. This continues until the calibrated voltage at the output of the digital-to-analog converter 13 becomes equal to the minimum amplitude of the input signal. At the output of the logic analysis unit 6 during the period of the modulating signal there are no pulses, and the input of the counter 7 receives n pulses from the output of the limiter-maker 5. With an overflow pulse, the counting counter is connected to the input of the counter with a digital indication, the output t5 of the key is through a serially connected driver sync pulses and a logic analysis block is connected to the control input of a summing counter, the output of the limiter maker is connected to the second input of the logic analysis block, the output of the control the voltage divider is connected to the control input of the regulation unit, the first output of which is connected to the control input of the control voltage divider, and its second output is connected to the control input of the switch, the control input of the delimiter of the imager is connected to the output 30 of the functional voltage divider characterized in that, in order to shorten the measurement time, the output of the logical analysis unit is connected to the control input of the tweak counter 7, the state is rewritten, with a digital indication, performed counter 10 in reg: tc 9 indicator - with an additional input, and exits, and then resetting counter 10 to the zero state. This completes the first hollow measurement cycle and immediately starts the next cycle. 0 ° view is connected in series. When the counter 10 is reset, the maximum calibration voltage level is formed at the output memory of the digital-to-analog converter 13 During the next full measurement cycle, the inputs of the functional divide-register 9 of the display are stored. blowing code counter 10, whose value corresponds to the modulation coefficient of the amplitude-modulated signal. 50 The process of measuring the modulation factor of an amplitude-modulated signal is fully automated due to the introduction of a functional relationship between the quantization step k-55 which is an additional input voltage level and the connection of a meter with a digital indication. The last bit is connected to the corresponding inputs of the functional voltage divider, completion and digital-analog converter, while the address inputs of the permanent storage device are 2. A device according to claim 1, wherein the counter with digital indication is made in the form of a counter, the serial outputs of which are connected to the corresponding inputs of the display register, the control input connected to the input of the counter, the control input of the cIUITI Order 2657/50 Circulation 730 Subscription Performance-1gr. pr-tie, Uzhgorod, st. Project, 4 four counter 10 Invention Formula 1. A device for measuring the modulation depth, comprising a controlled voltage divider, whose input is the device input, and the output of the controlled voltage divider through a serially connected key, limiter driver, and totalizer The counter is connected to the input of the counter with digital indication, the output of the key is connected through a sequentially connected driver of clock pulses and a logical analysis unit connected to the control input of a summing counter, the output of the limiter former is connected to the second input of the logical analysis unit, the output of the controlled voltage divider is connected to the control The normalization unit input, the first output of which is connected to the control input of the controlled voltage divider, and its second output is connected to the control input to On the other hand, the control input of the limiter of the imaging device is connected to the output of the functional voltage divider, characterized in that, in order to reduce the measurement time, the output of the logic analysis unit is connected to the control input of the counter with a digital indication, made with an additional input, and the outputs are sequentially connected to the last bit connected to the corresponding inputs of the function voltage divider, made of permanent memory devices, the inputs of the function splitter and, and digital-to-analog converter, while the address inputs of the persistent storage device of the persistent storage device are the inputs of the functional division of the voltage, This is additionally a counter with a digital indication. 2. The device according to claim 1, wherein the counter with digital indication is made in the form of a counter, the serial outputs of which are connected to the corresponding inputs of the display register, which controls the input connected to the input of the counter, and controls entrance to