SU781823A1 - Device for determining phase of spectral components of signal being investigated - Google Patents

Description

(54) DEVICE FOR DETERMINING THE PHASE OF SPECTRAL COMPONENTS OF THE RESEARCH SIGNAL The invention relates to computer technology and can be used to calculate the phase in real time, in particular in spectrum analyzers. A device is known for determining the phase of the signal under investigation, which is part of the spectrum analyzers and contains a large amount of digital nodes, which makes the meter more complicated, especially if the required range of the phase measurement is small 1. Closest to the proposed device, containing operational registers, multiplexer, comparison device. In addition, a divider input, a persistent storage device and a number of gates 2 are entered into it. The Fourier coefficients A (k) and B (k) after the comparison are fed to a digital divider. The result of the division is fed to the persistent storage as an argument. On the ROM output, discrete phase values are formed. A week of the remainder of this scheme is that it contains complex and expensive nodes, such as a divider and a 9-bit permanent memory. The purpose of the invention is to simplify the device for determining the phase of the spectral components. This goal is achieved by the fact that the device for determining the spectral components of the phase signal under investigation, containing the first and second operational registers, the inputs of which are the corresponding inputs of the device / and the outputs are connected to the corresponding inputs of the comparison unit and to the first and second inputs of the multiplexer the computation unit, the two-channel logarithmic unit and the adder, whose inputs are connected respectively to. the outputs of the operating registers, and the output is connected to the first input of the Dual Channel logarithm block, the second input of which is connected to the output of the multiplexer, the third input of which is connected to the output of the comparison block, the inputs of the subtractor are connected to the corresponding output--. mi of a two-channel logarithm block. FIG. 1 shows a functional diagram of the proposed device; in FIG. 2 is a graph of the error of phase determination.

The device for determining the phase includes operational registers 1 and 2, an adder 3, a comparison unit 4, a multiplexer 5, a two-channel logarithmic unit 6 and a validation unit 7.

The outputs of operating registers 1 and 2 are connected to the inputs of comparison unit 4, adder 3 and multiplexer 5, the output of comparison unit 4 is from the control input to multiplexer input of multiplexer 5, the outputs of adder 3 and multiplexer 5 are respectively with the first and second dual-channel inputs a logarithm block 6, the first and second ends of which are associated with the first and second inputs of the subtractor 7, which is the output of the device as a whole. The device works as follows.

The jointly normalized numbers and are entered into the operational shift registers 1 and 2. On the adder 3, their sum is obtained, after which the logarithm of the sum A (K) -V B {xb is formed on the first output of the block b logarithm.

Comparison unit 4, with which (сравни) and B are compared, controls multiplexer 5. As a result, the larger of these two quantities appears ria is output of multiplexer 5, and the second output of block 6 forms the logarithm of this value.

At the output of the subtraction unit 7, a difference is formed between the values obtained at the first and second outputs of the logarithm b, which is proportional to the phase

In accordance with the foregoing, the operation of the device is described by the following correlation

o4gS 1yu (to 1-lоSge u) fiuilii l ch. a j

f ilidlii i 1 f X

.eight

1Im

4-W; gg ° 4

From (1) it can be seen that when A (k) / B (k1 Q (Cf 0) at the output of the device is zero and at j 1 ((f 45) is one, At the same time, the true value of phase is 1k,

  (2)

i.e. phase error in degrees

° -4,: 4Hogj / 5a

The error of the phase values calculated using the proposed device, as can be seen from FIG. 2, does not exceed 0.55 when the phase changes from O dd 45 °,

In the proposed device, the phase is determined using only the operations of addition, subtraction and logarithmization, and the logarithm is the necessary node of any spectrum analyzer for calculating the amplitude of the signal on a logarithmic scale. This device is significant. Easier to compare with the scheme of the known device.

Claims (1)

Invention Formula A device for determining the Phase of the spectral components of the signal under investigation, containing the first and second operational registers, whose inputs are the corresponding inputs of the device, and the outputs are connected to the corresponding inputs of the comparison unit and to the first and second inputs of the multiplexer, in order to simplify the device , a subtraction block, a two-channel logarithm block and an adder are entered into it, whose inputs are connected respectively to the codes of the operational registers, and the output is connected to the first input for a two-channel logarithmic unit, the second input of which is connected to the output, a multiplexer, the third input of which is connected to the output of the comparator unit, 6jio subtraction inputs are connected to the corresponding outputs of the two-channel logarithmic unit. Sources of information taken into account in the examination 1, Patent SSI 3517173, class 235-181, 1970, 2, Pussor D ,, Ganguli U, Ekspressress analysis of the system kinetics - device for real-time transfer function analysis, T, I, I, E, R t, 65, 5, s, 184, .w at(") one fff; T FIG.