SU788163A1 - Device for switching-over recording tracks in tape recorder - Google Patents

Description

The invention relates to instrument engineering and can be used in magnetic information recording equipment designed for continuous and continuous recording. A device for switching recording tracks containing an electromechanical unit for vertical movement of a magnetic recording-reproduction head, a track number indication unit and control elements 1 is known. However, this device has insufficient speed, movement along a limited number of tracks and a relatively low head installation accuracy. It is also known a device for switching recording tracks in a tape mechanism, comprising a control spool connected to one of the coils of the tape mechanism by a counter and a torque lever, magnetic contacts included in the circuit of magnetic heads, and the lever connected to the switch rotomagnet equipped with a control magnet intermittently rotating in the same direction with the help of a swing lever and gear 2. The disadvantages of this device include its complexity and lack exactly high reliability, operation switches, large size and lack of precision actuation of the switch. The closest in technical essence to the present invention is a device for switching recording tracks in a tape recorder, comprising a reverse bus, an integrator, as well as a block of long-term memory, one output of which is connected through separate switches to magnetic recording heads and magnetic playback heads, respectively. the output is connected to the output bus and, via the decoder, to the indicator, one of its inputs is connected to the bit output of the meter, and the other its input is connected via the control unit to the bus Power 3. The disadvantage of this device is relatively low noise immunity. The purpose of the invention is to improve the noise immunity of the device. The goal is achieved by the fact that the device is equipped with a recovery switch, two delay lines and a Disable circuit, the bus "Reverse connected to one input of the Ban network directly and to the other through the first delay line, the output of which is simultaneously connected via the second delay line to the counting input the counter connected also to the input of the integrator connected by the output to the control unit, and the output of the Inhibit circuit is connected to the input of the recovery switch, the output of which is connected to the second input of the counter, and the second input One is connected to one of the outputs of the non-volatile memory unit, one of the inputs of which is connected to one of the. control unit inputs. -. The drawing shows a structural diagram of the proposed device.

The device consists of magnetic heads 1 and 2 of recording and reproducing connected through separate switches 3 and 4 to bus 5 and 6 recording and reproducing, counter 7, integrator 8 and block 9 of non-volatile memory connected via bus 10 11 power supply and connected to the parallel input 12 of the counter 7, with the control inputs 4 of the switches 3 and 4 of the magnetic heads 1 and 2, as well as via the restoration switch 13 with the installation inputs of the counter 7 and through the decoder 14 with the digital indicator 15. Bus 16 signal "Reverse connected to the first At the entrance of the scheme, the Forbid 17 is directly to the second through the first delay line 18, which is also connected to the second delay line 19. The output of the delay line 9 is connected to the counting input of the counter 7 and through the integrator 8 to the control input of the control unit 10, and the output of the Restriction circuit 17 is connected to the control inputs 20 of the recovery switch 13. Bus 2 is designed to reset the device. Tires 22 are used to transmit data to an external system, for example, in the form of a parallel binary code about the number of the track used. Tires 23 and 24 are used to force the desired recording track by giving them the binary code of the selected track number and the corresponding command to allow the operation.

The device works as follows.

The signal "Reverse in the form of a square pulse arrives through bus 16 directly and through delay line 18 to the inputs of the Inhibit 17 circuit. At the output of the Inhibit circuit, a short pulse is generated that goes to the control inputs 20 of the recovery switch 13 to enable the transmission through it stored in block 9 of long-term memory, for writing to counter 7. If in the time interval between the signals “Reverse, which can be of considerable length, counter 7 was accidentally disturbed, then the rewriting operation of the previous code is stored. th

by the block 9 of the long-term memory, the counter 7 will return it to the state in which it was set by the previous “Re” faith pulse.

Thus, the long-term memory node performs a quiz survey of the counter 7 and automatically corrects its false position each time before the next switching of the device. The "Reverse signal, delayed by the delay line 19 for the second time," is fed to the counting input of the counter 7 and through the integrator 8 to the control input of the control unit 10. After switching the counter 7, the signals at the outputs 12 of its bits, are sent for recording to the node 9 of a long-term memory, where simultaneously power is supplied via the control unit 10. The secondary delay of the signal "Reverse for a short time is necessary so that by the time the signal appears at the counting output of counter 7, correctional rewriting of the code from the non-volatile memory node into it will be completed. in order to achieve greater reliability of maintaining the former state of the long-term memory node to which power can be supplied only through the control unit 10. The new code generated by the non-volatile memory unit corresponding to the next track or group of tracks is fed to the control

0 inputs of switches 3 and 4, which connect the magnetic heads I and 2 corresponding to this code to women 5 and 6 of recording and reproduction. These signals are also fed to the inputs of the decoder 15, which is associated with the digital indicator 15, the number of tracks used, and through the buses 22 to the external system.

The proposed device generates and issues each newly installed code of the next regular usable track or groups of tracks,

has increased noise immunity that

provides high reliability

 device allows it to be used for

in the AMZ binary code with an external system, for example, with an electronic computer

S Noah machine.

Claims (3)

Invention Formula A device for switching recording tracks in a tape recorder containing a reverse signal bus, an integrator, as well as a non-volatile memory unit, one output of which is connected via separate switches to magnetic recording heads and magnetic playback heads, respectively, the 5th others output is connected to the output bus and through a decoder - with an indicator, one of its inputs is connected to the bit output of the counter, and the other its input is connected via a control unit to the power supply tin, characterized in that, in order to increase the noise immunity device, it is equipped with a recovery switch, two delay lines and a Disable circuit, the Reverse bus is connected to one input of the Ban network directly and to the other through a first delay line, the output of which is simultaneously connected via a second delay line to the counter count input connected also with the input of the integrator connected by the output to the control unit, and the output of the Inhibit circuit is connected to the input of the recovery switch, the output of which is connected to the second input of the counter, and the second input is connected to the single input v of outputs of the non-volatile memory unit, one of the inputs of which is connected to one of the inputs of the control unit. Sources of information taken into account in the examination  I. US Patent No. 3913140, cl. publish 1975. 2. USSR author's certificate number 326630, cl. G II 15/40. 1970. 3. Izmailov AM and others. Digital decades now and pulse counter with a long-term pas Rhibora and expert technique, 1978. № 5, p. 38-41 (prototype).