SU649020A1

SU649020A1 - Spectrum analyzer

Info

Publication number: SU649020A1
Application number: SU772525275A
Authority: SU
Inventors: Эрик Ашотович Дастакян; Тариэл Геворкович Гаспарян
Original assignee: Армянский Научно-Исследовательский Институт Строительства И Архитектуры
Priority date: 1977-09-29
Filing date: 1977-09-29
Publication date: 1979-02-25

Description

(54) АНАЛИЗАТОР СПЕКТРА(54) SPECTRUM ANALYZER

Изобретение относитс к приборостроению и может быть использовано при исследовании временных процессов электрических сигналов в различных отрасл 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.

Известны анализаторы спектра, содержащие аттенюатор с усилителем и фильтр, усилитель с биением, усилитель записи, магнитный носитель с приводом, калибровочный генератор, усилитель воспроизведени , блок контрол уровн , реле, генератор единиц, генератор дес тков, релаксатор , ждущий генератор, двигатели, усилители единиц и дес тков, детектор, схему совпадени , усилитель с разделенной нагрузкой , гетеродин, балансный смеситель, усилитель промежуточной частоты, самопишущий потенциометр и к.онтрольный прибор 1.Spectrum analyzers containing an attenuator with an amplifier and a filter, an amplifier with a beating, a recording amplifier, a magnetic drive with a drive, a calibration generator, a playback amplifier, a level control unit, a relay, a generator, a generator of tens, a relaxer, a standby generator, motors, amplifiers are known. units and tens, a detector, a matching circuit, a split-load amplifier, a local oscillator, a balanced mixer, an intermediate frequency amplifier, a self-recording potentiometer and a monitoring device 1.

Однако это устройство сложно.However, this device is difficult.

Наиболее близким к предлагаемому по своей технической сущности вл етс анализатор спектра, содержащий усилитель записи , подключенный к магнитной головке записи, магнитный носитель с приводом, магнитную головку воспроизведени , подключенную через усилитель воспроизведени и полосовой фильтр к блоку регистрации 2.Closest to the proposed technical essence is a spectrum analyzer that contains a recording amplifier, connected to a magnetic recording head, a magnetic carrier with a drive, a magnetic playback head connected through a playback amplifier and a band-pass filter to the recording unit 2.

Недостатком такого анализатора спектра вл етс низка точность анализа.The disadvantage of such a spectrum analyzer is the low accuracy of the analysis.

Целью изобретени вл етс повыщение точности анализа.The aim of the invention is to increase the accuracy of the analysis.

Это достигаетс путем снабжени анализатора спектра блоком изменени скорости магнитного носител , св занным с его приводом, а полосовой фильтр выполнен с фиксированной средней частотой.This is achieved by supplying the spectrum analyzer with a unit for changing the speed of the magnetic carrier associated with its drive, and the band-pass filter is made with a fixed center frequency.

На чертеже изображена блок-схема предлагаемого анализатора спектра.The drawing shows a block diagram of the proposed spectrum analyzer.

Claims

The signal under study from the output of the write amplifier I via the magnetic recording head 2 is recorded on magnetic carrier 3, for example a magnetic drum rotating at a certain fixed speed. The recorded information is reproduced by the magnetic reproduction head 4, amplified by the reproduction amplifier 5 and fed to the input of the band-pass filter 6 with a constant fixed center frequency, the width of which can be changed depending on the analyzer's purpose. The signal from the output of the bandpass filter 6 is fed to the input unit 7 of the registration. In order to decompose the signal under investigation into spectral components, when a signal is passed through a band-pass filter 6, at a constant fixed center frequency, magnetic carrier 3 must rotate at a tunable speed in order to be able to analyze spectral components in band-pass filter 6, fixed mid frequency. A change in the rotational speed of the magnetic carrier 3 is carried out by means of a change in the speed of the magnetic carrier associated with the block 8. The presence of a rate change unit and a single band-pass filter with a constant fixed average frequency, the bandwidth of which can be changed depending on the purpose of the analysis, distinguishes the proposed device from the well-known fact that all spectral components pass through this band-pass filter due to rotation variable speed. magnetic carrier. As a result, a linear amplitude-frequency characteristic is obtained in a wide frequency range and it is possible to make more accurate measurements of architectural acoustics and reduce the cost of a spectrum analyzer. A spectrum analyzer comprising a recording amplifier connected to a recording magnetic head, a magnetic carrier with a drive, a magnetic reproduction head connected through a reproduction amplifier and a band-pass filter to a recording unit, characterized in that it is equipped with a change block to improve the accuracy of the analysis. the speed of the magnetic carrier associated with its drive, and the band-pass filter is filled with a fixed average frequency. Sources of information taken into account in the examination 1. V. Kriksunov. Automatic analyzers of the spectrum of electrical signals. Kiev, St. Sizdat, 1965, 96-137.

2. Vollerner N.F. Instrumental analysis of signals. M., St. Sizdat, 1977, 88--198.