SU538310A1

SU538310A1 - Device for measuring magnetic recording-reproduction distortion

Info

Publication number: SU538310A1
Application number: SU2147706A
Authority: SU
Inventors: Александр Николаевич Баранов; Валерий Абдулович Слаев; Алексей Иванович Соболев
Original assignee: Предприятие П/Я А-1742
Priority date: 1975-06-23
Filing date: 1975-06-23
Publication date: 1976-12-05

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ИСКАЖЕНИЙ МАГНИТНОЙ ЗАПИСИ-ВОСПРОИЗВЕДЕНИЯ(54) DEVICE FOR MEASURING DISTORTIONS OF MAGNETIC RECORDING-REPRODUCTION

Изобретение относитс к измерительной технике, а именно к устройствам дл измерени искажений магнитной записивоспроизведени .The invention relates to a measurement technique, namely, devices for measuring the distortion of a magnetic recording reproduction.

Известно устройство дл измерени A device for measuring is known.

искажений магнитной записи-воспроизведени , содержащее генератор периодического сигнала, св занный через формирователь записываемого сигнала с узлом записи-воспроизведени 1. Известное устройство обеспечивает измерение искажений , специфичных дл процесса магнитной записи и воспроизведени .magnetic recording-reproduction distortions containing a periodic signal generator connected via a shaper of a recorded signal to a recording-reproduction unit 1. The known device provides measurement of distortions specific to the magnetic recording and reproducing process.

Известно также устройство дл измерени искажений магнитной записи-воспро изведени , содержащее генератор периодического сигнала, соединенный через формирователь записываемого сигнала со входом блока записи-воспроизведени , выход которого подключен к первому из входов блока вычитани напр жений 2. В этом устройстве второй вход блока вычитани напр жений подсоединен к преобразователю воспроизведенного сигнала в соответствии с период гаеским сигналом, в качестве которого используют периодический псевдослучайный сигнал. Подобное устройство просто по конструкции, однако вносит значительную погрешность в результат измерени .It is also known a device for measuring magnetic recording-reproduction distortions, comprising a periodic signal generator connected through a shaper of a recorded signal to an input of a recording-playback unit whose output is connected to the first of the inputs of the voltage subtracting unit 2. In this device, the second input of the subtraction unit Zhenyi connected to the converter of the reproduced signal in accordance with the period of the Gaes signal, which is used as a periodic pseudo-random signal. Such a device is simple in design, but introduces a significant error in the measurement result.

Цель изобретени - уменьшение погрешности результата измерени .The purpose of the invention is to reduce the error of the measurement result.

Достигаетс это тем, что в предлагав мое устройство введены временной селектор , подсоединенный к выходу блока записи-воспроизведени , и соединенные последовательно первый счетчиковый делитель, первый управл емый генератор, первый регул тор напр жени и первый фильтр нижних частот, включенные между генератором периодического сигнала и вторым входом блока вычитани напр жений.This is achieved by the fact that a time selector connected to the output of the recording-playback unit and the first counter divider, the first controlled oscillator, the first voltage regulator and the first low-pass filter connected between the periodic signal generator and the second input of the voltage subtraction unit.

Claims

In addition, the driver of the recorded signal is made in the form of a second counter divider connected in series, a second controlled oscillator and a second low pass filter, and a time selector is connected to the output of the second counter divider and to the inputs of the first counter divider and BOJo of the controlled oscillator. The drawing shows one of the possible variants of the proposed device for measuring distortion of magnetic recording-reproduction. The device contains a periodic signal generator 1, made in the form of a reference pulse generator. The output of the periodic signal generator 1 is connected to the first counter divider 2, connected via the first controlled oscillator 3 and the voltage regulator 4 to the first low-pass filter 5. The output of the periodic signal generator 1 is also connected to the input of the recording-reproducing unit 6 through the shaper of the recorded signal, consisting of a second counter divider 7 connected in series, a second controlled oscillator 8 and a second low pass filter 9, the output of the recording-reproducing unit 6 is connected to the first the input of the voltage subtraction unit 10, the second input of which is connected to the output of the first low-pass filter 5 and the output is connected to a voltage meter 11. The device also contains a time selector 12 connected to the output of the recording-playback unit 6 via a pulse former 13. Time selector 12 is also connected to the intermediate output of the second counter divider 7 and to the installation inputs of the first counter divider 2 and the first controllable, o generator 3, the controlled oscillators 3 and 7 are made in the form of a test generator signal. In the proposed device, a reduction in the measurement error is provided by using as a test signal such a sequence which has uniformly distributed spectral J and components in the passband of the signal under study. This reduction in measurement error is also achieved by using low-pass filters that match the width of the spectrum of the test signal with the bandwidth of the recording-playback channel under investigation. The use of devices substantially reduces the measurement result error in the device for measuring magnetic recording-reproduction distortions. Such a device can be used, for example, to measure nonlinear distortion or transient characteristics of a magnetic recording. Apparatus for measuring magnetic recording-reproduction distortion, comprising a periodic signal generator connected via a recorder of a recorded signal to an input of a recording-reproducing unit whose output is connected to the first of the inputs of a voltage subtracting unit, in order to reduce the error of the result measurements, a time selector connected to the output of the recording-playback unit, and connected in series, the first counter divider, the first the controlled oscillator, the first voltage regulator and the first low-pass filter connected between the periodic voltage generator and the second input of the voltage subtraction unit, and the writer of the recorded signal is in the form of a second counter oscillator connected in series, a second controlled oscillator and the second low-pass filter frequencies, and the time selector is connected to the output of the second counter divider and to the inputs of the first counter divider and the first controlled oscillator. Sources of information taken into account in the examination: 1. Japanese Patent No. 44-24390, class, 102 ЕО, publ. 15.10.69.

2. USSR Author's Certificate No. 473125, M.C., G-01 R 20/00, dated 1975