SU652604A1

SU652604A1 - Apparatus for reproducing period-modulated signals

Info

Publication number: SU652604A1
Application number: SU772510595A
Authority: SU
Inventors: Владимир Дмитриевич Свяченный; Георгий Николаевич Розоринов; Виктор Михайлович Казанцев
Original assignee: Предприятие П/Я А-7358
Priority date: 1977-08-01
Filing date: 1977-08-01
Publication date: 1979-03-15

Description

Изобретение относитс к области магнитной записи, в частности к устройствам дл воспроизведени модулированных по периоду сигналов.The invention relates to the field of magnetic recording, in particular, to devices for reproducing period-modulated signals.

Известно устройство дл воспроизведени модулированного по периоду сигнала, содержащее воспроизвод щую магнитную головку, выполненную с выходом сигнала, пропорционального производной изменени магнитного потока, подсоединенным через двусторонний амплитудный ограничитель и формирователь импульсов к демодул тору, соединенному через фильтр с выходной шиной 1.A device for reproducing a period-modulated signal is known, comprising a reproducing magnetic head, made with an output signal proportional to the derivative of the change in magnetic flux connected via a two-way amplitude limiter and a pulse shaper to a demodulator connected via a filter to the output bus 1.

Это устройство обеспечивает высокую точность восстановлени сигнала, записанного на носитель магнитной записи. Однако он имеет сложную конструкцию.This device provides high accuracy of recovery of the signal recorded on the magnetic recording media. However, it has a complex structure.

Известно также устройство дл воспроизведени модулированного, по периоду сигнала , содержащее воспроизвод щую магнитную головку, выполненную с выходом сигнала, пропорционального производной изменени магнитного потока, подключенным к двустороннему амплитудному ограничителю , сбединенному с входами первого и второго формирователей импульсов.It is also known a device for reproducing a signal modulated over a period, comprising a reproducing magnetic head, made with an output proportional to the derivative of the change in magnetic flux connected to a double-sided amplitude limiter coupled to the inputs of the first and second pulse shapers.

выходы последних подсоединены к входам логического элемента ИЛИ и к входам первого и второго формирователей пилообразного напр жени , выходы этих формирова .. гелей соединены с нервым и вторым сумматорами , подсоедине1щь ми через третий сумJ матор и фильтр нижних частот к выходной тине и подключенными к инверсному выходу третьего формировател пилообразиого напр жени , соединенного с выходом логического элемента ИЛИ 2.the outputs of the latter are connected to the inputs of the OR logic element and to the inputs of the first and second sawtooth voltage formers, the outputs of these gels are connected to the nerve and the second adders, connected via a third accumulator and low pass filter to the output tin and connected to the inverse output the third shaper sawtooth voltage connected to the output of the logical element OR 2.

Недостаток подобного устройства состоит в значительных комбинационных искажени х результата .воспроизведени модулированного по периоду сигнала.The lack of such a device consists in significant combinational distortions of the result of reproducing the period-modulated signal.

Цель изобретени - уменьшение комбинационных искажений результата воспроизведени модулированного по периоду сигиала .The purpose of the invention is to reduce the Raman distortion of the result of reproduction of the period modulated sigal.

Claims

To do this, in the proposed device for reproducing a period-modulated signal, an additional double-sided amplitude limiter and a third pulse shaper are inputted, the output of which is connected to the OR logic element, and the reproducing magnetic head is equipped with an additional output proportional to the magnetic flux value connected to the input of an additional two-way amplitude limiter. The drawing shows one of the possible variants of the proposed system for the performance of the modulated but the signal period. The proposed device contains a reproducing magnetic head 1, one behind the other with an underpowered node 2 connected to the input bus 3 via a period modulator 4. The magnetic head was reproduced by a signal output proportional to the change in the magnetic flux connected to the double-sided amplitude limiter 5, connected to the inputs of the first and second drivers 6 and 7 pulses, the outputs of the latter are connected to the inputs of the logic element OR 8 and the inputs of the first and second drivers 9 and 10 sawtooth voltage, while their output is connected to the inputs of the first and second adders 11 and 12, the outputs of these adders are connected via a third adder 13 and a low-pass filter 14 to the output bus 15, and the other inputs are connected to the inverse output of the third driver 16 sawtooth voltage connected to the output of the logical element OR 8. In the proposed device, the recoverable magnetic head 1 is made with an additional output signal proportional to the magnetic flux connected to the input of an additional two The external amplitude limiter 17 connected in series with the third pulse shaper 18, the output of which is connected to the logic element OR 8. In the proposed device, the first driver, 1 6, generates a signal on the leading edges of the follower (guests of two-way amplitude pulses, limiter 5, the second driver) 7 - on their rear edges, and the third driver 18 - on the front and rear edges of the pulse sequence of an additional two-sided amplitude limiter 17, while having two-sided 5 and amplitude ogra1P1chitel additional bilateral amplitude limiter 17 receives the pulse sequence shifted by a quarter period of the modulated period sigiala reproduced from the magnetic carrier zanisi. The latter leads to the formation of a quadruple frequency pulse sequence in the logical element OR 8. The use of the invention makes it possible to significantly reduce the combinational distortions of the reproduction result of the period-modulated signal. In addition, the use of the invention provides a relatively simple construction of a device for reproducing a period-modulated signal. Apparatus of the Invention A device for reproducing a period-modulated signal, comprising a reproducing magnetic head, made with an output signal proportional to the derivative of the change in magnetic flux connected to a two-way amplitude limiter connected through the first and second pulse drivers with the inputs of an OR gate and with the inputs of the first and the second formers of the sawtooth voltage, the outputs of which are connected to the first and second adders connected through the third sum Matrix and low-pass filter with an output width and connected to the inverse output of the third sawtooth voltage driver connected to the output of an OR logic element, characterized in that, in order to reduce the combinational distortions of the playback result, the additional two-way amplitude of The buncher and the third pulse shaper, the output of which is connected to the logical element OR, the reproducing magnetic head is made with a further output Home signal proportional to the magnitude of the magnetic flux that is connected to the input of the additional bilateral .amplitudnogo restrictor. Sources of information taken into account in the examination; 1. The UK patent number 1171316, cl. G 5 R, 1969.

2. USSR author's certificate number 477517, cl. H 03 D 3/04, 1973.