SU578623A1 - Spectrum analyser by haar function - Google Patents

Description

The analyzer contains a generator of 1 clock pulses, a switch 2, a selection and distribution unit 3, inverters 4i, 42, ..., 4p, resistors 5o, 5i, 62, ..., 5 ', integrators 6o, 6i, 62, .. ., 6p, recording unit 7, control unit 8.

A tunable frequency generator of 1 clock pulses is connected by an output to the input of an electronic switch of 2 channels in: sequential action; block 3 selekppi and distribution consists of a set of keys and of a release, their chains (decoupling diodes, emitter repeaters, amplifiers), the control input of each of the keys is connected to the corresponding output of the switch 2, and the output through the corresponding decoupling chains with one from two entrances of each channel, with the exception of the first channel; the first channel contains a channel resistor 5o, connected at one end to the signal input of block 3, and the other to channel integrator 6o with a reset, the output of which is connected to the first input of recording unit 7; The second channel contains an inverter 4i, the input of which is connected to the outputs of the second half of the keys of the block 3 through the corresponding decoupling chains, and the output of the inverter 4i through the channel resistor 5, also connected via the corresponding isolating chains to the outputs of the first half of the keys of the block 3, is connected to the integrator's input 6i with a reset, the output of which is connected to the second input of the recording unit 7; the third channel contains an inverter 42, the input of which is connected to the outputs of the second quarter of the keys of block 3 through the corresponding decoupling chains, and the output of the inverter 42 through the channel resistor 62, also connected via the corresponding isolating chains to the outputs of the first quarter of the keys of block 3, is connected to the input of the integrator 62 with a reset, the output of which is connected to the third input of the recording unit 7; the fourth channel contains an inverter 4z, the input of which is connected to the outputs of the last quarter of the keys of block 3 through the corresponding decoupling chains, and the output of inverter 4z through the channel resistor 5z, also connected via the corresponding isolating chains to the outputs of the third quarter of the keys of the block 3, is connected to the input integrator 6c with a reset, the output of which is connected to the fourth input of block 7, and so on; Two outputs of control unit 8 are connected to two inputs of generator 1, and the output of unit 8 is connected to the control inputs of all channel integrators with a reset.

In the operation mode, the analyzed signal is fed to the input of block 3 and to the input of block 8, which starts and sets the duration of operation of the generator I, generating clock pulses with a tracking interval A / equal to half the duration (in other words, positive or negative part)

the Haar function corresponding to the Fourier – Haar coefficient r with the highest number, which are fed to the start of the switch 2. The last j-th clock pulse on the cal-sd output at its tM output - a positive pulse of duration Ar, which opens the corresponding 1st block key 3, thereby skipping the i-io "cut of a signal of length At through the corresponding unblocking of the chain to one of two inputs: inverse or direct of all channels, each of which corresponds to the determined Fourier-Haar coefficient, except for the first-

channel corresponding to the zero coefficient of a number of Fourier – Haar series. In the caled channel, with the exception of the first one, this "cut of the analyzed signal is inverted or unchanged, depending on the current phase of this Haar function, poured through a 5ft channel resistor, the magnitude of which is aligned with the amplitude of this Haar function, / j with reset. At the same time

when the generator 1 ends at the output of the integrator 6o of the first channel, a zero coefficient of the Fourier – Haar series is generated; at the output of the integrator 6i of the second channel, the first coefficient of the yes Fourier series is

Haar, etc., which are recorded in block 7. To prepare the spectrum analyzer using the Haar fuses for analyzing the} signal, block 8 generates a signal that returns the channel integrators 6o-6p to the initial state. In addition, if necessary, block 8 performs electronic tuning of the frequency of the 1 clock pulse generator.

The proposed analyzer allows one to increase the speed and accuracy of calculating the Fourier – Haar series coefficients, to reduce the requirements for the dynamic range of amplitudes of the analyzed signals.

Form m l l a 3 o b e e n i

Spectrum analyzer by Haar functions,

containing a control unit and a recording unit, characterized in that, in order to improve the accuracy and speed of the calculation, a serially connected clock generator, an electronic switch, a selection and distribution unit, as well as chains consisting of series-connected inverters are additionally introduced, channel resistors and channel integrators, their outputs

connected to the inputs of the registering unit, and the inputs of the n chains are connected to the outputs of the selection and distribution unit, the second inputs of the channel integrators are combined and connected to the first output of the unit

control, the second and third outputs of which are connected to the inputs of the clock pulse generator, as well as serially connected additional channel resistors and an integrator connected between the fourth output of the control unit and one of the inputs of the registering unit.

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Sources of information taken into account in the examination

1. USSR author's certificate No. 424084, cl. G 01R 23/16, 14.08.72.

2. Authors certificate of the USSR L 442434, cl. G 01R 23/00, 08.18.72.

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