SU1383392A1 - Device for computing signal spectrum - Google Patents

Abstract

The invention relates to frequency spectrum signal analyzers and can be used for signal processing. The purpose of the invention is to simplify the device. The goal is achieved due to the fact that the device includes an analog-to-digital converter 1, a block of registers 2, generators of sine and cosine functions 3 and 4, multipliers 5 and 6, integrators 7 and 8, a functional converter 9 of the form K / NVX- -fY (rfle K is a constant, N is a conversion size), analog-to-digital converter 10, clock generator 11, synchronizer 12, switch 13, and the corresponding communications between device nodes. 1 il.

Description

Vy.G

(ABOUT

(L

 Vl.G

BblA.Z

with oo

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from th

Run

The invention relates to frequency spectrum signal analyzers and can be used for signal processing.

The purpose of the invention is to simplify the device by increasing the upper cut-off frequency of the analyzed spectrum.

The drawing shows the functional diagram of the device.

The device contains an input analog-to-digital converter (ADC) 1, block 2

The “H.R. and“ H.L.4 ”signals are supplied from the integers 7 and 8 of this device, and the“ In1 and ”H.2 inputs are used to expand the functionality of the device. If the input signal is UBX. real, to the inputs of "In. 1 and" In. 2, a zero, voltage level is applied. If the input signal is complex, UBX Z + jZj, two proposed devices, each of which are memory registers (input samples), are generated, which is generated by the corresponding quadrature

rators of sine 3 and cosine 4 functions, multipliers 5 and 6, integrators 7 and 8, functional converter 9 of the form

the signal component, and the outputs "Out1 and" Out.2 of one device are connected respectively to the inputs "Bx.1 and" Bx.2 of another device.

- V Y (where X is the difference of the signals by So, the functional transducer / distributor 9 calculates the complex complex

-7 from 1 to 1

inputs "In 4 and" In. Y is the sum of the signals at the inputs “Вх.Ь and“ Вх.З), the output ADC 10, the generator 11 clock pulses (GTI), the synchronizer 12 and the switch 13.

The device works as follows.

On a "Run" signal sent to synchronizer 12, integrators 7 and 8 are zeroed in and the selection of the input signal Uex from the A / D converter 1 is enabled in block 2 of the input sample registers. At the same time, the synchronizer 12 connects through the switch 13 an input signal UBX to the input of the integrator 8. From the output of the integrator 8, the signal through the functional converter 9 is fed to the A / D converter 10, where it is converted to

a good number

 V (n) X (p) + j, (n), where V (n) is the harmonic of the input signal; X (n) - the valid part:

X (n) | (Zan) Z. (n) sin) Y (n) is the imaginary part; „,

Y (p) 2 (Zs (n) (n) sin 1

2pp

25

The output of the functional converter 9 is connected to the input of the A / D converter 10, which with frequency f2 / N (where fa is the sampling frequency of values from block 2 of the input sample registers) converts the signal from the output of functional converter 9 into a digital-digital code. This code goes to the output of the code. The resulting digital code before the "Out. For the device as a zero harmonic input signal.

After storing the N samples of the input signal and calculating the zero harmonic, the synchronizer 12 switches the switch 13 and connects the output of the multiplier 6 to the input of the integrator 8. At the same time, the synchronizer generates an address for selecting the first value sample samples from the first value register 2 and the control code a (dependent from the number of the selected value) to form in the generators sine 3 and cosine 4 functions of the corresponding values of sin a and cos c. The digital code from block 2 of the input sample registers goes to multipliers 5 and 6, from which the input sample multiplied by the corresponding sine and cosine values goes to integrators 7 and 8. Thus, after selecting from the block 2 input sample counts, the values at the outputs Out and Out 2 of the device are signals proportional to the values

H-L2lKp

g (K) sin2X (K) cosЖn

is the value of the corresponding harmonic of the input signal and is fed to the output of the OUT of the device. After this, synchronizer 12 has zeroed the integrators, and the process of calculating the next

wasps harmonics. The computation time depends on the sampling frequency of the input signal fi, on the sampling frequency of input signal values from the memory fz, on the number of calculated harmonics and on the number of points used for calculating N.

40 The main influence on the conversion time is the frequency (ceteris paribus), which is determined by the speed of the memory device. The frequency fi is selected based on the desired upper cut-off frequency of the analysis.

45

Claims (1)

Invention Formula N A device for calculating a spectrum of signals comprising a cosine function generator, a sine function generator, a first analog-to-digital converter, first and second multipliers, a synchronizer and a clock generator, the first output of which is connected to the clock input of the synchronizer, the first output of which is connected to the inputs argument of the generator of sinus functions and the generator of cosine functions, the outputs of which are connected to the first inputs, respectively of the first output of the integrato), the signals arrive at the functional interface Brazovatel 9, which has four inputs. At the entrances The “H.R. and“ H.L.4 ”signals are supplied from the integers 7 and 8 of this device, and the“ In1 and ”H.2 inputs are used to expand the functionality of the device. If the input signal is UBX. real, to the inputs of "In. 1 and" In. 2, a zero, voltage level is applied. If the input signal is complex, UBX Z + jZj, two proposed devices are required for its processing, each of which processes the corresponding quadrature a good number  V (n) X (p) + j, (n), where V (n) is the harmonic of the input signal; X (n) - the valid part: X (n) | (Zan) Z. (n) sin) Y (n) is the imaginary part; „, Y (p) 2 (Zs (n) (n) sin 1 2pp 25 The output of the functional converter 9 is connected to the input of the A / D converter 10, which with frequency f2 / N (where fa is the sampling frequency of values from block 2 of the input sample registers) converts the signal from the output of functional converter 9 into a digital code. The resulting digital code before the code. The resulting digital code is the value of the corresponding harmonic of the input signal and is output to the output of the device. After this, synchronizer 12 has zeroed the integrators, and the process of calculating the next wasps harmonics. The computation time depends on the sampling frequency of the input signal fi, on the sampling frequency of input signal values from the memory fz, on the number of calculated harmonics and on the number of points used for calculating N. 0 The main influence on the conversion time is the frequency (ceteris paribus), which is determined by the speed of the memory device. The frequency fi is selected based on the desired upper cut-off frequency of the analysis. five Invention Formula A device for calculating a spectrum of signals comprising a cosine function generator, a sinus function generator, a first analog-to-digital converter, first and second multipliers, a synchronizer and a clock generator, the first output of which is connected to the clock input of the synchronizer, the first output of which is connected to the inputs argument of the sinus function generator and cosine function generator, the outputs of which are connected to the first inputs of the first and second multipliers, respectively, the second output of the clock pulse generator The pulses are connected to the clock input of the first analog-to-digital converter, the output of which is the output of the harmonic module of the device, the startup input of which is the synchronization start input, characterized in that, in order to simplify the device, it contains the first and second integrators, a switch, a register block , the second analog-to-digital converter and the function-oriented input converter KNVp (pf -fXs) + (Xs - X4) (where K is the counterpart, N is the size of the converter), the output of which is connected to the information input of the first analog-to-t rovogo converter, the output of the second analog-to-digital converter connected to the data input of the register block, the output of which is connected to the second inputs of the first and second multipliers, the outputs of which are respectively connected to the data input of the first integrator and the first information input of switch, the second information .The inputs of which is connected with in0 the formation input of the second analog-digital converter is the information input of the device, the output of the first integrator is the output of the real part of the device harmonic and is connected to the input of the Xs argument of the functional converter of the form Xs) - + (Xy-X4) whose arguments Xi and X2 Are the inputs of setting the first and second coefficients of the device, respectively, the output of the switch is connected to the information input of the second integrator, the output of which is the output of the imaginary part of the harmonic of the device and below The key is connected to the input of the X4 argument of the functional converter 5 of the form (X, -fX3) + (X2-X), the second synchronizer output is connected to the control input of the switch, the third synchronizer output is connected to the zero inputs of the first and second integrators, the fourth output of the synchronizer is connected to 0 to the clock input of the block of registers, and the third output of the generator of clock pulses is connected to the clock input of the second analog-digital converter.