SU830522A1

SU830522A1 - Spectrum analyzer

Info

Publication number: SU830522A1
Application number: SU792791060A
Authority: SU
Inventors: Эрик Ашотович Дастакян; Тариел Геворкович Гаспарян
Original assignee: Армянский Научно-Исследовательскийинститут Строительства И Архитектуры
Priority date: 1979-07-06
Filing date: 1979-07-06
Publication date: 1981-05-15

Description

(54) АНАЛИЗАТОР СПЕКТРА(54) SPECTRUM ANALYZER

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Изобретение относитс к приборостроению и может быть использовано при исследовании временных процессов электрических сигналов в различных област х науки и техники, например в акустике. The invention relates to instrumentation and can be used in the study of temporal processes of electrical signals in various fields of science and technology, such as acoustics.

Известен анализатор спектра, содержащий аттенюатор с усилителем, фильтр, усилитель с делением, усилитель записи, магнитный носитель с приводом, калибровочный генератор, усилитель воспроизведени , блок контрол уровн , реле, генератор единиц , генератор дес тков, релаксатор, ждущий генератор, электродвигатели, усилители единиц и дес тков, детектор,схему совпадени , усилитель с разделенной нагрузкой, гетеродин , балансный смеситель, усилитель промежуточной частоты, самопишущий потенциометр и контрольный прибор 1.The known spectrum analyzer contains an attenuator with an amplifier, a filter, a split amplifier, a recording amplifier, a drive-driven magnetic medium, a calibration generator, a playback amplifier, a level control unit, a relay, a generator unit, a tens generator, a relaxer, a standby generator, electric motors, amplifiers units and tens, detector, coincidence circuit, split load amplifier, local oscillator, balanced mixer, intermediate frequency amplifier, self-recording potentiometer and control device 1.

Недостатком данного устройства вл етс его сложность и высока стоимость.The disadvantage of this device is its complexity and high cost.

Наиболее близким к предлагаемому в . л етс анализатор спектра, содержащий усилитель записи, подключенный к магнитной головке записи, сопр женной с магнитным носителем, электропривод магнитного носител , магнитную головку воспроизведени , сопр женную с магнитным носителем и подключеннуюЧерез соединенные последовательно усилитель воспроизведени и полосовой фильтр с фиксированной средней частотой к блоку регистрации 2.Closest to the proposed in. Spectrum analyzer containing a recording amplifier connected to a magnetic recording head coupled to a magnetic carrier, magnetic drive, magnetic playback head coupled to a magnetic carrier and connected Through a series connected playback amplifier and band-pass filter with a fixed center frequency to the recording unit 2

К недостаткам этого анализатора спектра можно отнести сравнительно большое врем анализа, которое обусловлено невозможностью проведени анализа в процессе записи сигнала.The disadvantages of this spectrum analyzer include a relatively long analysis time, which is due to the impossibility of carrying out the analysis during the recording of the signal.

Цель изобретени - сокращение времени анализа.The purpose of the invention is to reduce the analysis time.

Claims

The goal is achieved due to the fact that a spectrum analyzer containing a recording amplifier connected to a magnetic recording head, conjugated with a magnetic medium, an electric magnetic drive, a magnetic playback head that is conjugated to a magnetic carrier and connected through connected in series playback amplifier and pologby filter with a fixed center frequency to the registration unit; it is equipped with a control unit and mechanically connected speed change unit and a reversible electric motor a lem, the magnetic playback head being rigidly mounted on the shaft of the speed changing unit. a control input of which simultaneously with the control inputs of the reversing motor and the registration unit is connected to the control unit. The drawing shows a structural diagram of the proposed spectrum analyzer. The recording amplifier 1 is connected to a magnetic recording head 2 coupled to magnetic carrier 3 having electric drive 4. Magnetic playback head 5 is also coupled with magnetic carrier 3 and rigidly mounted on the shaft of speed changing unit 6 mechanically connected to a reversing motor 7. Block The control unit 8 is connected to the control inputs of the speed control unit b and the reversing motor 7. The magnetic playback head 5 through the playback amplifier 9 and the band-pass filter 10 with a fixed average The frequency is connected to the registration unit 11, the control input of which is also connected to the control unit 8. The signal being investigated from the output of the recording amplifier by the magnetic recording head 2 is recorded on magnetic recording medium 3 at a certain fixed speed V0. The speed can be changed by switching the speed of the electric drive 4. Simultaneously with recording the signal, it is possible to reproduce and analyze information with the playback magnetic head 5, for example, so that when it rotates around its axis with the speed Vi, the working gap always faces the recording path of the magnetic carrier 3 The working gap of the magnetic reproduction head can be made in the form of a closed line located on a side surface whose center coincides with the axis of the head. The reproduced signal is amplified by the playback amplifier 9 and fed to the input of the band-pass filter 10 with a constant fixed center frequency, the width of which can be changed depending on the purpose of the analysis. The signal from the output of the bandpass filter 10 is fed to the first input of the registration unit 11, which records the level of the spectral components. To decompose the signal under investigation into spectral components, when a signal is passed through a band-pass filter 10, at a constant fixed center frequency, the magnetic playback head 3 must rotate at a tunable speed Vt, while the band-pass filter 10 analyzes the spectral components and drives them to a fixed medium frequency. The rotation of the magnetic reproduction head 5 is carried out by a speed change unit 6, mechanically connected to a reversing motor 7, and a command for speed switching is supplied from the output of the control unit 7. At the same time, from the same output, the signal is fed to the control input of the registration unit 11, which is currently fixed at the frequency at which the analysis is performed in the bandpass filter 10. When the signal under investigation is decomposed into spectral components, magnetic carrier 3 moves at a speed VQ, and magnetic head 5, the reproduction is rotated at a speed equal to V-ifilffl) V, ij. where fi is the selected spectrum of the signal under study; Vj, is the rotation speed of magnetic carrier 3; fo-constant fixed average frequency band-pass filter. The following conditions must be satisfied, Vt o. Vc 0,. The use of the invention allows to increase the accuracy and reduce the analysis time in the study of temporal processes. A spectrum analyzer comprising a recording amplifier connected to a magnetic recording head associated with a magnetic medium and connected through a reproduction amplifier connected in series and a band-pass filter with a fixed center frequency, to the recording unit, in order to shorten the analysis time It is equipped with a control unit and a mechanically connected speed change unit and a reversible electric motor, the magnetic playback head being rigidly mounted on the shaft. a speed change unit, the control input of which simultaneously with the control inputs of the reversing motor and the registration unit is connected to the control unit. Sources of information taken into account in the examination 1. Krikunov V. G. Automatic analyzers of the spectra of electrical signals. K., 1965, p. 128-137.

2. USSR author's certificate number 649020. class. G 10 L 1/02, 1977 (prototype).