SU736175A1 - Analogue memory - Google Patents

Description

The invention relates to an analog technique and can be used to create storage devices that serve to store analog signals arriving at the input of the device at random times and preserving information when the power is turned off. There are various constructive designs for recording and reproducing an analog signal, for example, memory tubes with a visible image 1. However, due to their design complexity, these devices have little reliability, are very difficult to operate, require a large number of auxiliary electronic equipment. The technical entity is an analog signal recording and reproducing device containing a storage medium made of a magnetostrictive material in the form of a tube. with a longitudinal groove, at the end of which a damper is located to prevent reflection of the ultrasonic pulse propagating in the storage medium, to the synchronizer determining the start of operation of the device, the input of which is connected to the input bus, the pulse shaper and ultrasonic transducer connected to the beginning of the carrier are connected in series information. The input of the read amplifier is connected to the control head, and you go to the amplitude detector, the output of which is in turn connected to the output bus of the device. The recording bus is magnetic with the information carrier and is connected with the input bus 2. In this device, the recording of an analog signal occurs on a data carrier, which is a tube of magnetostricdion material. A recording bus passes through the tube, through which a recording current flowing from the source of the analog signal flows, which is proportional to the amplitude of the analog signal. The magnetic field generated by this current cannot independently change the initial magnetic state of the information carrier. From the input bus, the analog signal is fed to a synchronizer, which is a trigger circuit that is triggered when an analog signal is received. The voltage drop from the output of the syncator is fed to the input of the pulse former acting on the ultrasonic transducer. An ultrasonic pulse excited by the ultrasound transducer propagates along the information carrier and is absorbed at its end by the damper. Due to the properties of the material from which the information carrier is made under the joint action of the mechanical voltage generated by the ultrasonic pulse and the magnetic field of the recording current, as the ultrasonic pulse is sent along the information carrier, its residual magnetization changes. and carries information about the recorded signal. The form of the residual magnetization along the length of the information carrier repeats the form of the recorded analog signal for the time during which the the sound pulse runs from the beginning to the end of the information carrier. The reading is done by rotating it fixed on the mandrel; data carrier with high speed directly from the reader. heads which can be mechanically moved along the information carrier. The voltage induced into the head by the magnetic flux of the longitudinal groove of the carrier is scattered by the read amplifier, detected by the amplitude detector and fed to the output bus of the device. This voltage, as a function of the position of the reading head along the data carrier, corresponds to the recorded signal as a function of it in time. The drawback of the device is the low accuracy of the analog signal recording, which is limited by the attenuation of the ultrasonic pulse along the information carrier, since the residual magnetization along the information carrier is a substantially nonlinear function of the amplitude of the ultrasonic impulse. Bel of the invention - improving the accuracy of recording and reproducing signals in the device. The goal is achieved by the fact that in an analog storage device containing a magnetostrictive storage medium with record windings: and a read, the output of which is connected to an acoustic damper, the input of the magnetostrictive storage of information is connected to the output of an ultra sound converter, an input. which is connected to the pulse driver output, the pulse driver input is connected to the synchronizer output, the input of which is connected to the device input and the write winding, serially connected read amplifier and amplitude detector, the output of which is connected to the device output, zero potential bus, magnetic alignment element is inserted into it connection, which is inductively coupled to a magnetostrictive storage medium and read counter, one pin of which is connected to the input of a read amplifier, and a second zero potential bus, the figure illustrates a functional diagram of the device. The device contains magnetostrictive information carrier 11, acoustic damper 2, synchronizer 3, pulse shaper 4, ultrasonic transducer 5, zero potential bus 6, read amplifier 7, amplitude detector 8, write bus 9, ultrasonic read equalizer 10 The ultrasonic reading tire is made in the form of a meander. The device works as follows. An analog signal is recorded on information carrier 1, which is a tape of magnetostrictive material. The information carrier 1 is covered by the recording bus 9, through which a current flows during recording that is proportional to the size of the recorded signal. The magnetic field generated by this current cannot independently change the magnetic composition of the information carrier. The input of the device is connected to the input of the synchronizer 3, which is a trigger circuit triggered when an analog signal is detected at the input of the device. The voltage drop from the output of the synchronizer 3 is fed to the input of the pulse shaper 4, which acts on the ultrasonic transducer 5. The ultrasonic pulse excited by the ultrasonic transducer 5 propagates along the information carrier 1 and is absorbed at its end by the damper 2, due to the properties of the material from which the carrier is made 1 of information, with the joint action of a mechanical voltage formed by an ultrasonic pulse and a magnetic recording field as the ultrasound passes pulse along the information carrier there is a change in the residual magnetization, which carries information about the recorded signal. The shape of the residual magnetization along the information carrier repeats the shape of the recorded analog signal. The duration of the memorized signal is equal to the time of propagation of the ultrasonic pulse from beginning to end.

information carrier. The accuracy of the analog signal sigi depends on the constancy of the properties of the information carrier along its length and on the degree of constancy of the amplitude of the ultrasonic pulse as it propagates through the carrier 1 of information. In the proposed device, the amplitude of the ultrasonic pulse is kept constant along the entire length of the information carrier by means of a special form of information carrier. As is known, when an ultrasonic pulse propagates in a homogeneous medium, its damping proceeds according to the law

where (Gh is the amplitude of the ultrasonic pulse at a distance k from the source;

Co is the initial amplitude of the ultrasonic pulse; (B is the attenuation coefficient of the ultrasonic pulse. If we assume that there is no damping, the amplitude of the ultrasonic pulse depends on the cross-sectional area of the information carrier as follows:

ASL Sx

where S, is the cross-sectional area

Cf data carrier directly at the ultrasound transducer; - cross-sectional area of the information carrier at the distance X from the ultrasonic transducer,

To maintain the amplitude of the ultrasonic pulse constant over the entire length of the carrier 1 information, you must perform the equality X g

5 o

one

5x

We derive the law of variation of the cross-sectional area of the information carrier.

.2x

 15-.

Reading information in the proposed device is carried out as follows; Again, an ultrasonic transducer 5 is excited, generating an ultrasonic pulse in the information carrier 1. When this pulse passes through the information carrier 1, an alternating voltage is induced in the read bus 10 due to the magnetoelastic effect in the read bus 10, the envelope of which is determined by the shape of the recorded analog signal, and the frequency by the read lead mean bus 10. This voltage is amplified in the read amplifier 7, detected in the amplitude detector 8 and fed to the output of the device.

The amplitude of the alternating voltage taken from the readout bus 10 is proportional to the magnitude of the axis-g of the exact magnetization of the nose section; body 1 of information under the influence of the ultrasonic J pulse, and the coefficient of magnetic coupling between the carrier 1 of information and the meander 10 reading. The residual magnetization of the information carrier 1 is determined by the recorded analog signal, the amplitude of the ultrasonic pulse due to the exponential shape of the information carrier is constant in length, and the magnetic coupling coefficient K between

5, the carrier 1 of information and the meander 10 readout bus is proportional to the width of the slit in the alignment element 11 and the thickness of the carrier 1 of information

K-dUIiiU f .. btx.d (X,

where d (x) is the width in element 11 of the magnetic coupling alignment

5X from ultrasound transducer 5;

btxi, h С (.) is, respectively, the ishrina and the thickness of the information carrier 1 at a distance of 0 from the NII X from the ultrasound transducer 5. To provide a constant amplitude of the characteristic along the length.

At a constant amplitude of 5 ultrasonic pulses, it is necessary that K const. This is provided by changing the width of the slit in the element.

According to the law, dXi is used as a carrier of 1 information tape from a thin

rolled to achieve a constant amplitude of the ultrasonic pulse along its length, it is convenient to change only the width of the carrier 1 information (with a constant thickness) according to the law 2k

Ñ-Ñ „-e J

where.by - width of the information carrier

directly about

ultrasonic transducer 5.

In this case, to ensure the constant of the coupling coefficient between the information carrier 1 and the read bus 10 in the element 11, a slot width is necessary

bcx -) - - --do-const,

where h is the thickness of the information carrier.

In order to maximize the coupling coefficient, it is necessary that b (x), or that the slit width in element 11 be equal to the minimum width of the information carrier 1.

Claims (2)

Claim Magnetostrictive analogue storage device 1, US Pat. G 11 C 27/00, 2. U.S. Pat. Kn.G 11 C 27/00, No. 3357001, 5.12.67. No. 3489869, 01/13/70 (prototype).