SU732980A1

SU732980A1 - Controlled delay device

Info

Publication number: SU732980A1
Application number: SU782619923A
Authority: SU
Inventors: Максим Владимирович Гитлиц; Сергей Валентинович Четкин; Валерий Николаевич Терентьев
Original assignee: Всесоюзный Заочный Электротехнический Институт Связи
Priority date: 1978-05-25
Filing date: 1978-05-25
Publication date: 1980-05-05

Description

1one

Устройство относитс к области приборостроени и может быть использовано в точной магнитной записи и видеозаписи.The device relates to the field of instrumentation and can be used in accurate magnetic recording and video recording.

Известны устройства, осуществл ющие переменную задержку сигнала 1.Devices are known that carry a variable signal delay 1.

Дл их работы необходимы сложные управл емые линии задержки на ЬС-звень х или регистрах хранени или преобразователи аналог-код.For their operation, complex controllable delay lines for HC-links or storage registers or analog-to-code converters are needed.

Наиболее близким к изобретению по технической сущности вл етс устройство регулируемой задержки, содержащее последовательно соединенные первый электронный ключ, фильтр низкой частоты и подключенный ко входу первого электронного ключа управл емый импульсный генератор 2.Closest to the invention, the technical essence is an adjustable delay device comprising a first electronic key connected in series, a low frequency filter and a controlled pulse generator 2 connected to the input of the first electronic key.

Недостатком устройства вл етс сложна схема управлени величиной задержки, представл юща собой отдельный блок переменной задержки дл импульсов управлени .The drawback of the device is a complicated delay control circuit, which is a separate variable delay block for control pulses.

Целью изобретени вл етс повыщение надежности устройства в работе.The aim of the invention is to increase the reliability of the device in operation.

Цель достигаетс тем, что в него введены головка воспроизведени , второй электронный ключ, дифференциальный усилительThe goal is achieved by the fact that a reproduction head, a second electronic switch, a differential amplifier are introduced into it.

и интегратор, при этом головка воспроизведени соединена с первым входом дифференциального усилител , выход которого через последовательно соединенные второй электронный ключ и интегратор одновременно соединен со вторым входом дифференциального усилител и через первый электронный ключ со входом фильтра низкой частоты, а управл ющие входы электронных ключей подключены к управл емому импульсному генератору.and an integrator, wherein the playback head is connected to the first input of a differential amplifier, the output of which is connected to the second input of the differential amplifier via the second electronic switch connected in series and the integrator and through the first electronic switch to the input of the low-pass filter, and controlled pulse generator.

10ten

Устройство (фиг. 1) состоит из последовательно соединенных головки воспроизведени 1, дифференциального усилител 2, второго электронного ключа 3, интегратора 4, первого электронного ключа 5, фильтраThe device (Fig. 1) consists of a serially connected reproduction head 1, a differential amplifier 2, a second electronic key 3, an integrator 4, a first electronic key 5, a filter

,5 6 низкой частоты, управл емого генератора 7 импульсов, представл ющего собой управл емый мультивибратор, подключенный к управл ющим входам электронных ключей., 5 6 low-frequency, controlled by the generator of 7 pulses, representing a controlled multivibrator connected to the control inputs of electronic keys.

Принцип работы устройства временной задержки по сн етс временными диаграм20 мами (фиг. 2).The principle of operation of the time delay device is explained in time diagrams (Fig. 2).

Claims

In accordance with the block diagram (Fig. 1), the magnitude of the reference of the difference signal at the output of the differential amplifier at time t is equal to: Y (t) x (t)) (t-nT), (l) where X (t) - the value of the input signal at time t; Y (t) is the value of the differential signal at time t; y (1-pT) is the value of the difference signal at the reference time points preceding the time t; T is the sampling period; с-constant of the integrator's discharge time. Similarly, for a point in time, t-T can be written: Y (tT) x (tT) (n + l) T (2) Substituting (2) into (I), we get -T / tSt Y t- (n + l) T, -Y (t) x (t) -r% x (tT) - “2. (t-nT) x ((tT) (3) Comparing (3) with (1), we conclude that the value of the signal is the inverting input of the differential amplifier at time t is equal to (t-T). If the time constant f is chosen large enough, then the value of this voltage will be equal to the voltage of the input signal at time t-T, i.e. the output signal will be delayed integrator with respect to the input by the magnitude of the sampling period. The input analog signal (Fig. 2, a) is shown, and in Fig. 2, b and 2.2, respectively, the samples of the difference signal at the output of the switch 3 and the step voltage at the integrator's output. In Fig. 2, the samples of this step voltage are shown after the first electronic key 5, controlled by pulses coming from the output of the multivibrator (Fig. 2.6). The output signal reconstructed from the sequence of these samples using a low-frequency filter is shown in FIG. 2, e. Thus, using the device, it is possible to realize the time delay of the reproduced analog signal, the magnitude of which is determined only by the frequency of the gating pulses, i.e. the level of the control signal at the input of the multivibrator. To restore the waveforms at the low-pass filter output, the maximum amount of delay created by the devices should not exceed the reciprocal of the doubled upper modulating frequency of the spectrum of the reproduced signal. Claims An adjustable delay device comprising a serially connected first electronic key and a low-frequency filter and a controlled pulse generator connected to the first electronic key, characterized in that, in order to improve operational reliability, a second electronic key is inserted into it, a differential amplifier and integrator, with the playback head connected to the first input of a differential amplifier, the output of which is connected through series The second electronic switch and the integrator are simultaneously connected to the second input of the differential amplifier and through the first electronic switch to the input of the low-frequency filter, and the control inputs of the electronic switches are connected to a controlled pulse generator. Sources of information taken into account in the examination 1. USSR author's certificate number 452003, cl. G 06 G 7/02, 1973.

2. The patent of Germany No. 2454233, cl. And 03 H 7/30, 1976.

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