SU1552115A1 - Spectrum analyzer - Google Patents

Abstract

The invention relates to radio metering technology and can be used to create spectral analysis devices. The purpose of the invention is to simplify the change of the used system of orthogonal functions. This is achieved through the use of generator-controlled orthogonal functions and their corresponding weighting function, an amplifier with a controlled gain, an electronic key, an integrator, multipliers, and a memory block fixing the determined value of the spectral coefficient. To synchronize the operation of the blocks, a control block is used, according to the control signals of which the generators change the form of the generated functions, and the amplifier - the value of the transmission coefficient; in addition, the duration of the iteration consisting of two cycles is formed. 3 il.

Description

This invention relates to a radio measuring technique and can be used to create spectral analysis devices.

The purpose of the invention is to simplify the change of the used system of orthogonal functions.

Figure 1 shows the structural. spectrum analyzer circuitry; 2 shows a control unit; on Fig.Z - timing diagrams.

The spectrum analyzer contains a switch 1, a scaling unit 2, the first and second multipliers 3 and kt generator 5 orthogonal functions (GF), amplifier 6 with controlled transmission coefficient (UCP), control block 7, electronic switch 8, integrator 9 and block 10 memories.

Scaling unit 2 contains the third multiplier 11 and the generator 12 of the weighting function.

The control unit 7 comprises a controlled generator 13, the first and second triggers and 15f the first and second elements AND 16 and 17, the decoder 18 and

counter 19.

The electronic key 8 comprises the first and second controlled keys 20 and 21.

Spectrum analyzer works as follows.

The analyzed signal is supplied to the third input of the switch 1 (figure 1). The control unit 7, one of the possible implementations of which is shown in FIG. 2, generates a signal on the Start signal (FIG. 3a), for example, pressing a button.

1C

ate

whether the time (figure 3Ј), which is determined by the initial setting of the counter HI and the code of the decoder 18 (figure 2), at the ffr output the clock pulses (figure 3 &), which arrive at the combined first inputs of the scaling unit 2 and the GOF 5 at the second output is the control voltage that is fed to the second input of the PCS 6, and at the same time it changes the value of the transfer coefficient; on the third and fourth outputs, respectively, a meander (ig. 32, $) and a moander shifted by half a period (fig.Za), which arrive at the corresponding inputs (first and second) of the electronic key 8, i.e. The second inputs of the first and second control keys 20 and 21, the signal from the fourth output of the control unit 7 is fed to the combined second inputs of the switch t and unit II) of the memory. At the same time, the signal from the output of memory block 10 through the first multiplier 3, switch I, scaling unit 2, second multiplier, UCP 6 and first control key 20 goes to the first (subtractive) input of integrator 9, which corresponds to interval a in FIG. . In this case, the signals at the outputs of the integrator 9 and the memory block 13, respectively, have the form shown in FIG. 3 and FIG. 3. In this case, it is considered that the signal is stored in memory 10 with a level x0 .. During the next cycle, which is formed & g controlled oscillator 13, which corresponds to interval b in FIG. 3, the analyzed signal through switch 1, scaling unit 2, second multiplier, UCP 6 and second controlled key 21 is fed to second input (summing) of integrator 9 10 memory remembers the variable signal at the output of the integrator and 9 (Fig, 3k, l). Then the cycle (iteration), consisting of two cycles, is repeated. i

According to the signal from the first output of the control unit 7, the GOF 5 and the generator 12 of the weighting function respectively form the orthogonal and weighting functions. The appearance of a specific orthogonal function (Fig. 3) is determined by the code that goes to the control input of the spectrum analyzer, t.e. to the second input of GOF 5, which forms one or another system of orthogonal functions, in accordance with

0

0

5 5

The second establishes the kind of weight function that the weight function generator 12 forms.

The CCS 6 changes its transmission coefficient by the action of a signal that comes from the second output of the control unit 7. This contributes to a more rapid convergence of the result obtained at the output of the memory block 10 to the desired value of the spectral coefficient, i.e. by the end of the transition process and the steady-state value of the signal at the output of the memory block 10.

In control block 7 (FIG. 2), the first trigger I triggers a signal with a logic level 1, which is fed to the controlled oscillator 13, the first and second elements 16 and 17, while the controlled oscillator 13 generates clock pulses ( Fig. 3 &), which are fed to the first output of the control unit 7 and to the input of the second trigger 15, from the direct and inverse outputs of which the signals, respectively, arrive at the corresponding inputs of the second and first elements And 17 and 16, which form the signals (Fig. , $ 0) respectively coming n third and fourth outputs of the control unit 7. On the signal start edge, the counter 19 sets its initial value, and on the front of signals that come from the direct output of the second flip-flop 15, it subtracts from the set initial value. On the signal front, which comes from the output of the decoder 18, the first trigger 14 generates a signal at the output with a logic level of O.

40

Claims (1)

Invention Formula A spectrum analyzer containing a scaling unit, an orthogonal function generator, an electronic key and an integrator, characterized in that, in order to simplify the change of the used orthogonal function system, serially connected memory unit, first multiplier and switch, serially connected second multiplier and control amplifier are introduced transfer coefficient and control unit, first,. the second, third and fourth outputs of which are respectively connected to the combined first inputs of the scale J8 Ttl FI.2.