SU993318A1

SU993318A1 - Device for reproducing frequency-modulated signals from magnetic carrier

Info

Publication number: SU993318A1
Application number: SU813332426A
Authority: SU
Inventors: Вячеслав Кузьмич Цапулин; Виктор Александрович Горячев; Кирилл Иванович Майоров
Original assignee: Предприятие П/Я В-2867
Priority date: 1981-08-21
Filing date: 1981-08-21
Publication date: 1983-01-30

Description

Изобретение относится к приборост* роению, в частности к устройству, предназначеннЬму для воспроизведения частотно-модулированных сигналов с магнитного носителя, используемого в аппаратуре магнитной записи и воспроизведения служебной информации.The invention relates to instrumentation * in particular, to a device for reproducing frequency-modulated signals from a magnetic medium used in equipment for magnetic recording and reproduction of service information.

Известно устройство, с помощью которого осуществляют воспроизведение с магнитного носителя сигналов, записанных методом частотной модуляции, содержащее ряд формирующих, логических и переключающих элементов, с помощью которых записанный сигнал превращается в аналоговый, далее усиливается и используется для виз'уального наблюдения или прослушивания.A device is known by which reproduction from a magnetic medium of signals recorded by the frequency modulation method is carried out, containing a number of shaping, logic and switching elements by which the recorded signal is converted to analog, then amplified and used for visual observation or listening.

Если же преобразование не происходит, то такой сигнал может быть использован для получения видеоинформации или кодовой информации £1 ].If the conversion does not occur, then such a signal can be used to obtain video information or code information £ 1].

Однако в указанном устройстве не промежуточного преобраэосигнала, а также его огточность воспроиэведимой не всегда оказывается высокой, что снижает, напроисходит вания фазы раничения, информации достаточно пример, разрешающую способность видеоинформации.However, in the indicated device, not an intermediate conversion of the signal, as well as its turn-around of the reproducible signal, is not always high, which reduces the appearance of the phase of separation, the information is sufficient for example, the resolution of video information.

Наиболее близким к предлагаемому является устройство для воспроизведения частотно-модулированных сигналов с магнитного носителя, состоящее из трех последовательных электри· ческих цепей, первая из которых содержит входную шину, Первый элемент И, первый и второй одновибраторы, вторая - подключенный к входной шине второй элемент И, первый триггер,третий элемент И, формирователь информа, ' ционных импульсов., а третья - связанный с первым элементом Й второй триггер, четвертый элемент И, формирователь синхроимпульсов и выходную шину, синхроимпульсов [2].Closest to the proposed device is a device for reproducing frequency-modulated signals from a magnetic medium, consisting of three consecutive electric circuits, the first of which contains an input bus, the first element And, the first and second one-shot, the second - connected to the input bus, the second element And , the first trigger, the third element And, the driver of informational pulses., and the third - connected to the first element Y, the second trigger, the fourth element And, the driver of clock pulses and the output bus, sync pulses [2].

Известное устройство также не позволяет с достаточной точностью осуществлять воспроизведение частотномодулйрованных сигналов,кроме того, некоторое снижение точностй связано с наличием фазовых искажений.The known device also does not allow with sufficient accuracy to reproduce frequency-modulated signals, in addition, a certain decrease in accuracy due to the presence of phase distortion.

Цель изобретения - повышение точности воспроизведения частотно-модулированных сигналов путем уменьшения в них фазовых искажений.The purpose of the invention is to increase the accuracy of reproduction of frequency-modulated signals by reducing phase distortion in them.

Указанная цель достигается тем, что в устройство для воспроизведения .частотно-модулированных сигналов с [Магнитного носителя, состоящее из трех последовательных электрических цепей, первая из которых содержит входную шину, первый элемент И,первый и второй одновибраторы, вторая - подключенный к входной шине второй элемент И, первый триггер, третий эле- 5 мент И, формирователь информационных импульсов, а третья - связанный с первым элементом И второй триггер,четрертый элемент И, формирователь синхроимпульсов и выходную шину синхроим-10 пульсов, введены элемент ИЛИ, первый и второй элементы Й-НЕ, третьи элементы И-НЕ, одновибратор и триггер, а также пятый и шестой элементы И, при этом выход первого одновибратора (5 через последовательно соединенные третий одновибратор, пятый элемент И, элемент ИЛИ, третий элемент Й-НЕ подключен к входам первого элемента И-НЕ, второго триггера и первого jq элемента И, второй вход пятого элемента И связан с первым выходом третьего триггера, первый вход шестого элемента И - с выходом второго одновибратора, второй вход шестого элемента И - с вторым выходом третьего триггера, а выход этого же элемента - с вторым входом элемента ИЛИ, второй вход второго элемента И - с входом третьего элемента И-НЕ, выход · первого элемента И-НЕ - с первым входом третьего триггера, выход второго элемента И-НЕ - с вторым входом третьего триггера, выход третьего элемента И - с входом второго элемента И-НЕ, а выход первого триггера - с 35 вторым входом первого элемента И-НЕ.This goal is achieved by the fact that in the device for reproducing .frequency-modulated signals from the [Magnetic carrier, consisting of three serial electrical circuits, the first of which contains the input bus, the first element And, the first and second one-shot, the second - connected to the input bus of the second element I, the first trigger, the third element 5, the driver of information pulses, and the third - associated with the first element And the second trigger, the fourth element And, the driver of the clock and the output bus sync-10 bullets s, the OR element, the first and second Y-NOT elements, the third NAND elements, the one-shot and trigger, and the fifth and sixth AND elements, the output of the first one-shot (5 through the third one-shot, the fifth AND element, are connected in series) OR, the third element is NOT connected to the inputs of the first element AND, the second trigger and the first jq element And, the second input of the fifth element And is connected with the first output of the third trigger, the first input of the sixth element And - with the output of the second one-shot, the second input of the sixth element And - with the second output m of the third trigger, and the output of the same element with the second input of the OR element, the second input of the second element AND with the input of the third AND-NOT element, the output of the first AND-NOT element with the first input of the third trigger, the output of the second AND-NOT element - with the second input of the third trigger, the output of the third AND element - with the input of the second AND-NOT element, and the output of the first trigger - with 35 the second input of the first AND-NOT element.

На чертеже приведена структурная схема предлагаемого устройства.The drawing shows a structural diagram of the proposed device.

В устройстве входная шина 1 через первый элемент И 2 и первый одновиб- 40 ратор 3 подключена к второму одновибратору 4, формирователь 5 информационных импульсов включен между элементом Иби информационной шиной 7, формирователь 8 синхроимпульсов 45 включен между элементом И 9 и выход-. 1Н0Й шиной 10 синхроимпульсов. Кроме того, элемент И 9 связан с триггером 11, а элемент И б через триггер 12 связан с элементом И 13. Аналогия· ным образом триггер 14 связан одновременно с элементами И-НЕ 15 и 16, а также с элементами И 17 и 18, первый из которых нагружен на одновибратор 19, подключен к элементу ИЛИ ,, 20, в свою очередь нагруженному на элемент И-НЕ 21,In the device, the input bus 1 through the first element 2 and the first one-shot 3 is connected to the second one-shot 4, the information pulse shaper 5 is connected between the Ibi element and the information bus 7, the clock generator 8 is connected between the And 9 element and the output -. 1N0Y bus 10 clock pulses. In addition, the And 9 element is connected to the trigger 11, and the And b element through the trigger 12 is connected to the And 13 element. Analogy · in the same way, the trigger 14 is connected simultaneously with the AND-NOT elements 15 and 16, as well as the And 17 and 18 elements, the first of which is loaded on a single vibrator 19, is connected to an OR element, 20, in turn, loaded on an AND-NOT element 21,

Условно назовем элемент И 13.вторым, элемент И 6 третьим, элемент И 9 четвертым, элемент И 17 пятым, 60 а элемент И 18 шестым, одновибратор 19 третьим, элемент И-НЕ 15 первым, элемент И-НЕ 16 .вторым, элемент И-НЕ 21 третьим, триггер 12 первым,триггер 11 вторым, и триггер 14 третьим. 65 (Первая электрическая цепь состоит из входной шины 1, элемента И 2, одп новибраторов 3 и 4, вторая цепь - из ^элемента И 13, триггера 12, элемента И 6, формирователя 5, а третья цепь - из триггера 11, элемента И 9, формирователя 8 и шины 10.We arbitrarily call element AND 13.th, element AND 6th third, element AND 9th fourth, element AND 17th fifth, 60th element AND 18th, single vibrator 19th third, element AND-NOT 15 first, element AND-NOT 16th. Second, element AND NOT 21 third, trigger 12 first, trigger 11 second, and trigger 14 third. 65 (The first electrical circuit consists of an input bus 1, element And 2, odnovibrator 3 and 4, the second circuit - from ^ element And 13, trigger 12, element And 6, former 5, and the third circuit - from trigger 11, element And 9, shaper 8 and bus 10.

В процессе воспроизведения информации с магнитного носителя (не показан) элемент И-НЕ 15 определяет в сигнале наличие нулей, которые создают на выходе этого элемента низкий потенциал, что устанавливает триггер 14 в единичное состояние.Наличие единиц устанавливает этот триггер в нулевое состояние. Это важно, так как триггер 14 управляет процессом выделения информационных и синх- , роимпульсов, что связано с взаимной работой соединенных с ним. элементом как по входу, так и по выходу. При этом длительность сигналов, формируемых одновибратором 19, превышает длительность сигналов, формируемых одновибратором 4, на величину, определяемую максимально возможным смещением импульсов при изменении кодовой последовательности с нуля на единицу, что может быть связано с частотно-фазовыми искажениями воспроизводимого, сигнала. Например, если величину максимального смещения импульсов воспроизводимого сигнала при изменении кодовой последовательности с нуля на единицу считать равной 0,25 Т, где Т - период следования импульсов синхронизации, т.е. синхроимпульсов,то увеличение длительности сигналов, формируемых одновибратором, должно составлять 1/3 длительности импульсов воспроизводимого частотно-модулированного сигнала. Подача сигналов одновибраторов 4 и 19 по второму входу элемента И 2 и аналогичному входу элемента И 13 осуществляется с помощью элемента И 17, элемента И 18, элемента И-НЕ 21 и элемента ИЛИ 20.In the process of reproducing information from a magnetic medium (not shown), the AND-NOT 15 element determines the presence of zeros in the signal, which create a low potential at the output of this element, which sets trigger 14 to a single state. The presence of units sets this trigger to zero. This is important, since trigger 14 controls the process of extracting information and sync, pulse pulses, which is associated with the mutual work of those connected to it. element as input and output. Moreover, the duration of the signals generated by the single-shot 19 exceeds the duration of the signals generated by the single-shot 4 by an amount determined by the maximum possible shift of the pulses when the code sequence changes from zero to one, which may be associated with the frequency-phase distortions of the reproduced signal. For example, if the magnitude of the maximum shift of the pulses of the reproduced signal when changing the code sequence from zero by one is assumed to be 0.25 T, where T is the period of the synchronization pulses, i.e. sync pulses, then the increase in the duration of the signals generated by a single vibrator should be 1/3 of the pulse width of the reproduced frequency-modulated signal. The supply of signals from the one-shots 4 and 19 at the second input of the And 2 element and the analogous input of the And 13 element is carried out using the And 17 element, And 18 element, And-NOT 21 element and OR element 20.

Предлагаемое устройство позволяет снизить погрешность воспроизводимого сигнала до 10%, что уменьшает необходимость дублирования каналов воспроизведения, а это снижает энергои трудозатраты.The proposed device allows to reduce the error of the reproduced signal by 10%, which reduces the need for duplication of the playback channels, and this reduces energy and labor costs.

Claims

The invention relates to instrumentation, in particular, to a device for reproducing frequency-modulated signal streams from a magnetic medium used in magnetic recording equipment and for reproducing service information. A device is known by which it is possible to reproduce from a magnetic signal carrier, recorded by frequency modulation, containing a number of shaping, logic and switching elements, with which the recorded signal is converted to analog, is further enhanced and is used for visual observation or evaluation. However, if probing does not occur, such a signal can be used to obtain video information or code information tl 3. However, in the specified device there is no intermediate conversion of the signal phase, as well as its limitation, the reproducibility The information is not always high enough, which reduces, for example, the resolution of the video information. The closest to the present invention is a device for reproducing frequency-modulated signals from a magnetic carrier, consisting of three consecutive electrical circuits, the first of which contains an input bus, the first element And, the first and second one-vibrators, and the second - connected to the input bus. , the first trigger, the third element And, the driver of information pulses., and the third - associated with the first element And the second trigger, the fourth element And, the driver of clock pulses and the output bus, sync pulses 2. The known device also does not allow with sufficient accuracy to reproduce the frequency-modulated signals, in addition, some reduction in accuracy is associated with the presence of phase distortion. The purpose of the invention is to improve the accuracy of reproduction of frequency-modulated signals by reducing the phase distortion in them. This goal is achieved in that a device for reproducing frequency-modulated signals from a magnetic carrier, consisting of three consecutive electrical circuits, the first of which contains an input bus, the first element And, the first and the second one-vibrators, the second - connected to the input bus the second element is AND, the first trigger, the third element is AND, the driver of information pulses, and the third is associated with the first element And the second trigger, the fourth element AND, the driver of clock pulses and the output bus of clock pulses , the OR element, the first and second AND-NOT elements, the third AND-HB elements, the one-shot and trigger, as well as the fifth and sixth AND elements are introduced, and the output of the first one-shot through the third one-shot, the fifth one-shot, the the third element AND-NOT is connected to the inputs of the first element AND-NOT, the second trigger and the first element AND, the second input of the fifth element AND is connected with the first output of the third trigger, the first input of the sixth element AND with the output of the second one-shot, the second input of the sixth element And - with the second release of tr the second trigger, and the output of the same element - with the second input of the element OR the second input of the second element AND - with the input of the third element AND-NOT, the output of the first element AND-NOT - with the first input of the third trigger, the output of the second element AND-NOT - with the second input of the third trigger, the output of the third I element - with the input of the second element NAND, and the output of the first trigger - with the second input of the first element NAND. The drawing shows a block diagram of the proposed device. In the device, the input bus 1 through the first element 2 and the first one vibrator 3 is connected to the second one-oscillator 4, the shaper 5 information pulses are connected between the element 6 and the information bus 7, the shaper 8 clock pulses are connected between the element 9 and the output (NOI bus 10 clock pulses In addition, AND 9 is associated with trigger 11, and Ib through trigger 12 is associated with AND 13. In a similar way, trigger 14 is associated simultaneously with AND 15 and 16 elements, as well as AND 17 elements. and 18, the first of which is loaded on one-shot torus 19, is connected to the element OR 20, in turn loaded on the element AND NOT 21, Conditionally we call the element AND 13 the second, the element And 6 the third, the element H 9 the fourth, the element And the 17th fifth, and the element And 18 the sixth, the one-shot 19 third, AND-NOT element 15 first, AND-NOT element 16; second, AND-NOT element 21 third, trigger 12 first, trigger 11 second, and trigger 14 third. (The first electrical circuit consists of input bus 1, AND element 2, one-i. Novibrators 3 and 4, the second circuit - from element And 13, trigger 12, element And 6, driver 5, and the third chain - from. Trigger 11, element And 9, form worldviewer 8 and bus 10. In the process of reproducing information from a magnetic carrier (not shown), the element IS-NOT 15 detects the presence of zeros in the signal, which create a low potential at the output of this element, which sets the trigger 14 into one state. this trigger is in the zero state. This is important because trigger 14 controls the process of extracting informational and sync, pulse, which is associated with the mutual work connected to it. element of both input and output. At the same time, the duration of the signals formed by one-vibrator 19 exceeds the duration of the signals generated by the one-shot 4 by an amount determined by the maximum possible pulse displacement when the code sequence changes from zero to one, which can be associated with reproduction frequency signal . For example, if the magnitude of the maximum displacement of the pulses of the reproduced signal when the co-sequence changes from zero to one is assumed to be 0.25 T, where T is the period of the synchronization pulses, i.e. sync pulses, the increase in the duration of the signals generated by the single vibrator should be 1/3 of the duration of the pulses of the reproduced frequency-modulated signal. The signals of the one-shot 4 and 19 are fed to the second input of an AND 2 element and the same input of an AND 13 element using an AND 17 element, an AND 18 element, an IS-NE 21 element and an OR 20 element. The proposed device reduces the error in the reproduced signal to 10 %, which reduces the need for duplication of playback channels, and this reduces energy and labor costs. Apparatus of the Invention A device for reproducing frequency-modulated signal switches from a magnetic carrier, consisting of three consecutive electrical circuits, the first of which contains an input bus, the first And element, the first and second one-shot, the second And second element connected to the input bus, the And element, the driver of information pulses, and the third — the second trigger connected with the first element And the second trigger, the fourth element AND, the sync pulse generator and the output clock of the sync pulse, characterized by m, that, in order to increase the accuracy of reproduction of frequency-modulated signals by reducing the phase distortions in them, it contains: the OR element, the first and second And-NB elements, the third And-.HB element, the one-shot and the trigger, and the fifth and sixth elements AND, with the output of the first one-shot through the third one-channel alternately connected, the fifth element AND, the element OR, the third element AND-NB is connected to the inputs of the first element AND-NB, the second trigger and the first element And, the input of the fifth element of And associated with the release of the third trig Hera, the first input of the sixth And element - with the output of the second one-shot, the second input of the Sixth element And - with the second output of the third trigger, and the output of the same element - with the second input of the OR element, the second input of the second And element - with the input of the third And-NB element , the output of the first I-NB element is with the first input of the third trigger, the output of the second I-NB element is with the second input of the third trigger, the output of the third I element is with the input of the second I-NB element, and the output of the first trigger is with the second input of the first element I-nb. Sources of information taken into account in the examination 1. Japanese Patent 50-8329, cl. 102, B 335, 1975.

2. USSR author's certificate according to the application 2877442 / 18-10, cl. G 11 V 5/04, (prototype).