SU1034044A1 - Device for calculating random signal average power - Google Patents

Abstract

A DEVICE FOR CALCULATING THE AVERAGE POWER OF RANDOM SIGNALS containing .behindraber and pulses, the output of which is connected to the first Bxoiaj, analog-digital converter, averaging unit, the output of which is connected by the first input of the registration unit, the input of which is connected to the output of the scaling counter, and the output of which is connected to the output of the scaling counter, which output is connected to the output of the scaling counter, and the output of which is connected to the scaling counter. square, the matching unit, whose input is the input of the device, is, in order to improve accuracy. fiCKulOSff f an analog adder digital-analogue converter, a pseudo-random number generator, a multiplication unit, a digital adder, a delay element, the output of the matching unit connected to the first input of the analog adder, the second input of which is connected to the output of the digital-analogue converter, the last input connected to the first input of the block multiplying and connected to the output of a pseudo-random number generator, the input of which is combined with the input of the delay element and connected to the output of the pulse generator, the output of the analog The adder is connected to the second input of the analog-digital converter, the output of which is connected to the second input of the multiplication unit and to the input of the quadrant, the output of which is connected to the first input of the digital calculator, the second input of which is connected to the first digital accumulator the input of the averaging unit, the second input of which is combined with the input of the large-scale counter and the connection 4: O 4. yen with a high delay entry. Nt;

Description

The invention relates to specialized computer facilities for instrumental determination of the characteristics of random processes, namely, for estimating the average power of an uncentered signal or dispersion of a centered signal or a quadrant of the effective value of an arbitrary waveform.

A device is known for determining the average power and dispersion of a random process, a co-generator of pulses, digital-analog. a converter (D / A converter), an analog adder and a counter. In this device, the input signal is sampled by a sampling and storage circuit, after which a square switch is calculated by a functional spreading unit; this is the instantaneous value of the signal; a 111}.

 The device is characterized by high accuracy, however, it achieves, due to an increase in conversion time, since each fixed instantaneous value of the input,; the signal is converted slowly. Uy.Schim reamer converter. . ,

The closest to the prv lag: etome; according to technical. a device for subtracting the average power of random signals in co-; tav which entrance sogdasov- block; Nor, the input of which is expensive is the first one, the first switch. the output of which is connected to from the inputs of the analogue-digital digital output, the other input of which is connected to the output of the control unit r the second switch, the first output of which is connected to the first input of the averaging unit, the second input of which is connected to one of the in. the outputs of the control unit, - the second output of the second switch is connected to: the square-ora input, and the p unit: the egist, racter 2 |. J

The underdevelopment of the known device is the low accuracy of the estimate of the average power of a random signal.

The purpose of the invention is to improve the accuracy of the device.

This goal is achieved in that a device for calculating the average power of random signals comprising a pulse generator,. . the output of which is connected to the first input of the analog-digital converter, averaging unit, the output of which is. connected to the first input of the registration unit., the second input of which is connected to the output of the scale counter, the erection unit and the square, the matching unit, which is the input of the device, is entered

analog adder, digital-to-analog converter, pseudo-random number generator, multiplication unit, digital adder, delay element, output of the matching unit connected to the first input of the analog adder, the second input of which is connected to the output of the digital-analog converter, the input of the last combined with the first input of the multiplication unit and connected to the output of the pseudo-random number generator, the input of which is combined with the input of the delay element and connected to the output of the pulse generator, the output of the analog adder is connected to the second input of the analog-digital converter,. The input of which is connected to the second platoon of the multiplication unit and to the input of the quad, the output of which is connected to the first input of the digital adder, the second input of which is connected to the output of the multiplication unit, the output of the digital adder is connected to the first input of the averaging unit, the second input of which is combined with the input scale: counter and is connected to the output of the delay element.

The drawing shows the block diagram of the device .; . The device comprises a matching unit 1, an analog adder 2, an analog-to-digital converter A / D converter 3, a squaring unit 4, a multiplication unit 5, a digital adder b, an averaging unit 7, a recording unit 8, a pulse generator 9, a pseudo-random number generator 10 delays, scale counter 12, D / A converter 13. The principle of operation of the device is based on coarse stochastic quantization of the input signal. Convertible

the signal is summed with a two-field RNP 5 uniformly distributed auxiliary signal, and the resulting additive mixture of deterministic quantized ADC 3. The characteristic of quantization of ACI 3 must be symmetrical relative to the zero level, and this level must be in the middle of the junior quantum. In this case, the unbiased estimate of the square of the instantaneous value of the signal will be

(ti) (), / 6j-2.,.), - 4.Mf9 where. implementations of auxiliary: th random signal, e.g. pseudo-random

numbers;

q is the ADC quantum value;

  - i-ro quantization result

tact

It turns out that the sum of all the quantities stored in the box is zero if the entire period of the generator of 10 pseudo-random numbers is used in the calculation of the average power. Then the estimate is the value of (n q - 2p.) Q (the common term with a correct choice of the number of quantization levels can be taken into account when scaling the result of the calculation). With coarse quantization, as a rule; because of this, the squaring and multiplication operations make it extremely easy. c. For example, for a four-level ADC, p may be O, ± 1, ± 2. In this case, to estimate the square of the instantaneous values of the signal, they will consist of the Members n (0; i / 4; 1) lv and -2 n-, q (Oj ±.; 12 whose formation is trivial. The device works as follows ;.: The pulse generator 9 clocks the pseudo-random number generator 10. Another front of the same pulses is the small-sized ADC 3. The compensation time required for processing the ADC code 3 / is delay element 11. The delayed pulse is gated by the average unit 7. The number is scaled by a scale counter 12 delayed pulses, volume scale The counter 12 determines the duration of the internal block, i.e. the conversion cycle. In the process of converting, uniformly distributed generator codes 10 pseudo-random numbers of the DAC 13 are converted into a two-pole analog signal, which: V. analog adder 2 is summed with the input signal passed through the lasso block 1. The matching unit 1, as in the known device, amplifies the input signal and increases the input impedance of the device. The resulting additive mixture is roughly quantized by ADC 3, after which the quantization result is raised to. second degree by block 4 per square squared, and also multiplied by bl. 5; multiply with the corresponding pseudo-random number -. For a small d -; -; The main ADC 3 blocks 4 squaring and 5 multiplications can be extremely simplified and executed, for example, in a decoder and shift register. Available at the outputs of blocks 4 and 5, the individual terms of the quadra-; The instantaneous value of the signal in: the digital accumulator 6 is summed up and: the resultant cyN # ja in block 7 averaging is averaged. At the end of the conversion cycle under the influence of f pulse: overflow of scale j: counter 12, the average estimate of the power {\ it) of power is recorded by 6 block 8; registration. After that, the device is ready for the next 6 cycles of average power calculation. ; Due to the introduction of new J blocks and connections, the prototype's lack of current — the presence of thematic, thematic error of conversion — the main: low-capacity Ailiff — invention efficiency of the new and more accurate computational tools: intended for the day of the apparatus; energy evaluation; human. G characteristics of non-centered 1che caiy-. tea signal, as well as when measuring electrical measuring instruments, to determine the effective value. voltages of arbitrary shape.

Claims (1)

DEVICE FOR CALCULATING THE AVERAGE POWER OF RANDOM SIGNALS, containing a pulse generator ·, .. the output of which is connected to the first input of an analog-to-digital converter, an averaging unit whose output is connected to the first input of the recording unit, the second input of which is connected to the output of the scale counter, squaring unit, matching unit, the input of which is the input of the device, it is important that, in order to improve accuracy, an analog adder, a digital-to-analog converter, a pseudo-generator is introduced into it random numbers, multiplication unit, digital adder, delay element, matching unit output is connected to the first input of the analog adder, the second input of which is connected to the output of the digital-analog converter, the input of the latter is combined with the first input of the multiplication unit and connected to the output of the pseudo random number generator, whose input combined with the input of the delay element and connected to the output of the pulse generator, the output of the analog adder is connected to the second input of the analog-to-digital converter (calling device, the output of which is connected inen with the second input of the multiplication unit and with the input of a quadrator, the output of which is connected to the first input of the digital adder, the second input of which ~ is connected to the output of the multiplication unit, g the output of the digital adder is connected to the first input of the averaging unit, the second input of which is combined with the input of the scale counter and connect. it with the output of the delay element. with