SU454559A1 - Spectrum analyzer on haar functions - Google Patents

Description

The invention relates to a computational technique and can be used in radio technical equipment, acoustic studies of deterministic and random signals. Spectrum analyzers are known by Haar functions, containing a control unit 1i, the output of which is connected to a group of inputs of a reversible counter block and a frequency divider block. However, they cannot be used when working in digital complexes, which sup1 naturally narrows down the class of tasks solved by the operator. The purpose of the invention is the creation of such an analyzer, which could work in conjunction with digital computers, having the ability to process signals specified in digital form, as well as the implementation of the issuance of the analysis results on one recording device, such as a magnetic drum, magnetic tape. To do this, a memory block, an assembly scheme, a key group, a registration block and an input converter are entered into the device, the first input of which is connected to the device input, the second input - to the output of the control unit, and the output - to the input of the frequency divider unit and the input of the reversible counter unit The outputs of this block are connected to the first inputs of the first key pile, the outputs of which are connected to the first inputs of the memory block, the outputs of the block are connected to the first inputs of the second package of keys, the outputs of which are connected to the inputs of the corresponding circuits Borok. The outputs of the assembly circuits are connected to the inputs of the registration unit, the second inputs of the nerve and second key groups, the inputs of the reversible counter block and the memory block are connected to the corresponding outputs of the control unit. The drawing shows a block diagram of a spectrum analyzer. It contains a control unit 1, a drive converter 2, a block 3 of frequency dividers, a block 4 of reversible counters, keys 5 and 6, a block of memory 7, an assembly circuit 8, a registering block 9. The device works as follows. The signal under study is fed to the input of converter 2. Pulses from its output are fed to the input of series-connected stages of the frequency motor unit 3 and to the input of the reversible counter 4 of the first measurement channel, which produces dead signals, and then subtracts in accordance with the pulses from control unit 1 to the control inputs of the reversible counter. In accordance with the structure of the Haar function, several different Haar functions may end at the same time. In the spectrum analyzer, this leads to the fact that at this moment the epeMtniM in several reversible counters will generate the values of the spectral components, which must be immediately removed from the reversible counters, since the incoming pulses from the input transducer can change the contents of any reversible counter. In this device, the computation in the reversible counters of the values of the spectral components is transferred to the registers of memory block 7, from which they are output alternately, but with a much lower speed. It is only necessary that the reading from each register of the memory be carried out earlier than the next result of the calculations will be entered into it. The difference in reading the values of spectral components from different memory registers allows using one register unit 9, whose inputs are connected to the outputs of memory registers of block 7 using keys 6 and assembly circuits 8, and the corresponding choice of read moments from memory registers allows reduce the rate of emission of spectral components to the recording device. For each reversible counter of block 4, the summation time, as well as the subtraction time, is equal to half the duration of the Haar function, for which the value of the spectral component is determined in this reversal counter. The result of the summation and subtraction of pulses with an accuracy of a constant multiplier coincides with the measured value of the spectral component. Immediately after the end of the calculation of the spectral component, keys 5 are opened with a pulse from the control unit and the result from the reversing counter 4 is not transferred to the memory register of the block 7. Then the reversible counter is reset to its initial state and the impulses start again, i.e. the determination starts

spectral component values for the next Haar function of the same group. After the required time has elapsed, the keys 6 from the control unit 1 receive an impulse, opening 1: them, and the result stored in memory block 7 is output to the assembly circuits 8, from which they go to the registering unit 9. In various memory block 7 registers the storage time of the calculation results is different. By appropriate selection of these times, it is ensured that at the outputs of the assembly circuits 8, the values of the spectral values tijtHX appear at the maximum possible time interval.

Subject invention

The spectrum analyzer according to the Haar functions contains a control unit, the output of which is connected to a group of inputs of a block of reversible meters and a block of frequency dividers, characterized in that, in order to expand the class of tasks, it is equipped with a memory block, an assembly circuit, a key group, a block registration and the input transducer, the first input of which is connected to the device input, the second input - to the output of the control unit, and the output - to the input of the frequency divider unit and the input of the reversible counter unit, the outputs of which are connected to the first input The signals of the first group of keys, the outputs of the latter are connected to the first inputs of the memory block, the outputs of which are connected to the first inputs of the second group of keys, the outputs of which are connected to the inputs of the corresponding assembly circuits, the outputs of the assembly circuits are connected to the inputs of the registration block, the second inputs of the first and second groups the keys, the inputs of the reversible counter unit and the memory unit are connected to the corresponding outputs of the control unit.

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